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AUTOMATIC MESSAGE PLAYBACK WITH PAGING Background Music with Message Repeater and Priority Paging
AUTOMATIC MESSAGE PLAYBACK WITH PAGING
Background Music with Message Repeater and Priority Paging
AN-2143
Description:

An RDL TX‑J2 Unbalanced Input Transformer is used to sum and balance the stereo consumer output from the background music source. The TX‑J2 output is connected to the balanced music input of the FP‑MR2 Message Repeater which ducks the background music during message playback. The message plays at regular intervals set on the front‑panel interval timer DIP switches.

Audio from the FP‑MR2 is connected to Input 2 of the RDL HD‑MA35A Mixer Amplifier. A priority paging microphone is connected to the HD‑MA35A Input 1 which is set to duck signals from all other inputs to the mixer amplifier. The constant voltage output of the mixer amplifier provides 35 W RMS for the connection of 25 V, 70 V or 100 V loudspeakers.

The FP‑MR2 is powered directly from the 24 Vdc output on the rear of the HD‑MA35UA. A computer or any other unbalanced line‑level source may be used to transfer a recorded message to the FP‑MR2.

STEREO REMOTE AUDIO LEVEL CONTROL Studio Quality Volume Adjustment for Professional and Consumer Applications
STEREO REMOTE AUDIO LEVEL CONTROL
Studio Quality Volume Adjustment for Professional and Consumer Applications
AN-2158
Description:
The RU‑VCA2A Two Channel Digitally Controlled Attenuator and RLC10K Remote Level Control are used to increase and decrease the level of the Stereo Sound source feeding the amplifiers. The RU‑VCA2A offers clickless level adjustment, accurate tracking and outstanding wide‑band, low‑noise studio quality performance. It can be controlled remotely by a variety of RDL or third‑party controls and/or locally via front‑panel pushbuttons. Each audio input and output may be configured balanced or unbalanced. Multiple RU‑VCA2As and/or RU‑VCA6As may be linked together for single‑point level control of 7.1, 10.2 or 22.2 surround sound systems.
VISUAL MONITORING OF LOUDSPEAKER CIRCUITS Real-Time Metering Confirms Loudspeaker Circuit Continuity
VISUAL MONITORING OF LOUDSPEAKER CIRCUITS
Real-Time Metering Confirms Loudspeaker Circuit Continuity
AN-2168
Description:
The RU‑SM16A Dual Audio Meter is installed to provide a visual indication of the amplifier output level as well as a verification of the speaker circuit’s continuity. One meter string is driven directly by the amplifier output while the second is fed by a return cable connected to the last speaker in the circuit. During proper system operation, both meter displays are identical. Any fault in the system causes the level to drop on the meter connected to the end of the constant voltage speaker circuit. The RU‑SM16A Dual Audio Meter and RU‑SM16D Quad Audio Meter provide precision audio level metering of line‑level audio as well as constant voltage or low‑impedance loudspeaker circuits.
AUTOMATIC CONTROL OF HOTEL AUDIO SYSTEM POWER Conserve Energy and Simplify Unattended Operation
AUTOMATIC CONTROL OF HOTEL AUDIO SYSTEM POWER
Conserve Energy and Simplify Unattended Operation
AN-2105
Description:
The RDL FP‑ECC1 Energy Conservation Controller automatically powers up the electronics for this hotel meeting room when needed and powers down the equipment when the audio sources are not in use to conserve energy and reduce operating costs. “Trigger” inputs bridge the mic and/or line level signals from the room to switch the system equipment on. Once on, the presence of a line level signal from the RU‑MX4 Mixer at the “hold” input keeps the system powered. After a switch‑selectable time period of 15, 30, or 60 minutes with no audio, the FP‑ECC1 will turn off the system electronics. No operator intervention is needed to turn the system on or off. The RLC10K wall control connected to the ST‑VCA3 Voltage Controlled Amplifier allow adjustment of background music levels when there is no live event in the room. The D‑ECR1L Power On/Off Remote Control allows the system to be manually turned on and/or off. It also provides a system master level control to adjust the volume of the RU‑PA40D 40 Watt Stereo Power Amplifier.
INTERCOM USING SINGLE REMOTE SPEAKER Speaker Serves Dual Duty as Microphone and Speaker
INTERCOM USING SINGLE REMOTE SPEAKER
Speaker Serves Dual Duty as Microphone and Speaker
AN-2021
Description:
This intercom application reduces the hardware requirements for a secure or weatherproof call box like those found in drive‑through talkback systems or secured entryways. The ST‑IC1 Intercom Amplifier input accepts a dynamic mic or phantom powered condenser mic. It can also use an 8 Ω or a 45 Ω speaker as a microphone element. An ST‑LCR1 Logic Controlled Relay is used in this application to switch a remote speaker so that it can function alternately as a speaker and as a microphone.
PRIORITIZED PAGING Voice-Over/Paging with Multiple Paging Locations
PRIORITIZED PAGING
Voice-Over/Paging with Multiple Paging Locations
AN-2041
Description:
This application provides multiple paging locations, with priority assigned to each location. Each location has a mic with a PTT (push‑to‑talk) momentary pushbutton that provides external switching contacts. The STM‑2 preamp for each microphone should be installed near the associated mic. Wiring between each STM‑2 output and the corresponding ST‑VP1 is balanced, connected with shielded or unshielded twisted‑pair cable. When a PTT button associated with a microphone is depressed, the music fades down and paging becomes active. The highest priority mic overrides the lower priority mic(s). This arrangement may be carried out for an unlimited number of paging locations.

The FP‑PA20A 20 Watt Power Amplifier feeding 70 Volt speakers is used in this example. RDL offers a wide range of power amplifiers for paging and public address applications.
MULTI-POINT ROTARY ENCODER LEVEL CONTROL Multiple Control Points for Room or Zone Audio Level with Supervisor Mute Control
MULTI-POINT ROTARY ENCODER LEVEL CONTROL
Multiple Control Points for Room or Zone Audio Level with Supervisor Mute Control
AN-2171
Description:
In this office sound system, the audio level in the employee work area may be adjusted from two different locations in the area and by the supervisor. Two D‑RLC10 wall‑mounted Remote Level Controls provide rotary volume adjustment and visual indication of the level adjustment in the work area. The supervisor’s D‑RLC10M Remote Level Control with Muting is further equipped with a front‑panel mute button which cannot be overridden by the work area controls. When active, the D‑RLC10M MUTE function shuts off the audio signal. When MUTE is toggled off, audio is restored to the previously set level. The single D‑RLC10M and two D‑RLC10s are shown controlling an RDL ST‑VCA3, or they may be used with any RDL VCA or OEM product requiring a 0 to 10 Vdc Ramp to control level.
FORMAT-A SOURCE SELECTOR & IN-WALL AMPLIFIER Distribute Three Audio Sources to Multiple Locations Over UTP Cable
FORMAT-A SOURCE SELECTOR & IN-WALL AMPLIFIER
Distribute Three Audio Sources to Multiple Locations Over UTP Cable
AN-2220
Description:
Three styles of music are distributed to various rooms in this facility over CAT 5 cable by an RU‑TPS4A Format‑A Active Sender / Distributor. A D Series‑TPRX3A Source Selector and D Series‑PA3 Audio Amplifier installed in each room allow the occupants to listen to any of the three types of music provided or to listen to their own program material simply by plugging their MP3 player into the front‑panel input on the D‑PA3 amplifier. The front‑panel local input overrides the distributed audio.
MULTIPLE USER LEVEL CONTROLS FOR SINGLE ZONE Multiple Control Points Provided by Rotary Optical Encoder Remote Controls with Muting
MULTIPLE USER LEVEL CONTROLS FOR SINGLE ZONE
Multiple Control Points Provided by Rotary Optical Encoder Remote Controls with Muting
AN-2169
Description:
This basic sound system provides two D‑RLC10M Remote Level Controls with Muting for end users to adjust the volume from two different locations. The master D‑RLC10M creates the 0 to 10 Vdc control voltage that sets the gain of the ST‑VCA3 Voltage Controlled Amplifier. The ST‑VCA3 adjusts the audio level feeding the system audio power amplifier. The slave D‑RLC10M sends up/down and muting commands to the master D‑RLC10M. An end user can turn the volume up or down, and mute or unmute the system from either remote control. Pressing the MUTE button on either D‑RLC10M shuts off the audio signal. Audio is restored to the previously‑set level when the MUTE function is released by pressing either MUTE button again. These controls, one set to MASTER and the other to SLAVE, are shown connected to an ST‑VCA3 Voltage Controlled Amplifier but can be used with any other RDL VCA or OEM product requiring a 0 to 10 Vdc ramp for level control. As many as ten D‑RLC10M Remote Controls may be connected together in one zone. These remote controls are also available in black (DB‑RLC10M) and stainless steel (DS‑RLC10M).
PROVIDE POWER TO THREE FORMAT-A LOUDSPEAKERS Connect Multiple Powered Speakers to a Single Format-A Cable Run
PROVIDE POWER TO THREE FORMAT-A LOUDSPEAKERS
Connect Multiple Powered Speakers to a Single Format-A Cable Run
AN-2235
Description:
Three Format‑A powered speakers require more power than is available from a single Format‑A sender jack. And its available power is further reduced by the distance of the cable run. This installation provides a TX‑TP4PW Power Inserter at a suitable cable distance from the three listening locations. All three Format‑A sources on pairs A, B and C pass through the TX‑TP4PW and are available at each powered speaker. A recessed rear‑panel switch is set by the installer on each D‑PSP1A to select which pair is amplified. The three loudspeakers may be set to amplify the same pair if desired, or each may amplify a different pair. All the Format‑A modules are powered by the external supply connected to the TX‑TP4PW
BASIC PAGING OVER BACKGROUND MUSIC User-Controlled Voice-Over Paging with 70 V Amplification of BGM and Paging
BASIC PAGING OVER BACKGROUND MUSIC
User-Controlled Voice-Over Paging with 70 V Amplification of BGM and Paging
AN-2050
Description:
This system allows a push‑to‑talk tabletop microphone to interrupt background music during paging. The system can be set up to completely remove the background music or to simply duck the music to a preset level. The ST‑VP2 Automatic Ducking Module allows the end user to dial in exactly how much ‘ducking’ of the music is desired. The ST‑GCA3 Gain Control Amplifier insures consistency of level from the paging source. The system uses a 20 watt 70 V amplifier driving two 70 V speakers each tapped at 10 Watts.
ADDING A ZONE TO AN EXISTING DISTRIBUTED 70 V SYSTEM
ADDING A ZONE TO AN EXISTING DISTRIBUTED 70 V SYSTEM
AN-2025
Description:
A 70 V audio signal is being distributed to multiple zones in a facility. The RDL TX‑70A provides for the expansion of the existing 70 V system by converting the 70 V signal to an unbalanced line level signal. The unbalanced audio signal feeds the FP‑PA20A 20 Watt 70 V Audio Power Amplifier, which powers the speakers in the additional zone. The TX‑70A is equipped with a level trimmer for achieving optimal signal level.
MONO AUDIO FORMAT CONVERSION Balanced Audio Amplification for a Long Cable Run Connecting Unbalanced Equipment
MONO AUDIO FORMAT CONVERSION
Balanced Audio Amplification for a Long Cable Run Connecting Unbalanced Equipment
AN-2180
Description:
The STA‑1M Mono Line Amplifier is used to balance an unbalanced signal and amplify it to +4 dBu balanced for a long cable run. The TX‑1A at the receiving end provides transformer isolation, adjustable attenuation and format conversion to match the unbalanced equipment input. Note: The STA‑1M input may be wired for balanced or unbalanced operation.
GATED MIC PREAMPLIFIER DETECTS SIGNAL PRESENCE Preamp Suppresses Ambient Noise While Idle and Provides Visual Indication of Speech Activity
GATED MIC PREAMPLIFIER DETECTS SIGNAL PRESENCE
Preamp Suppresses Ambient Noise While Idle and Provides Visual Indication of Speech Activity
AN-2176
Description:
The ST‑GSP1 Gated‑Speech Preamplifier produces gated line‑level audio from a balanced dynamic or condenser microphone. The preamp output remains off when no one is speaking into the microphone, thereby not picking up and amplifying ambient room noise. The moment someone speaks into the microphone, the output of the ST‑GSP1 turns on, feeding line‑level audio to the sound system. The SLAVE output terminal is used to activate the ST‑LCR1 Logic Controlled Relay which provides a contact closure to turn on a visual indicator. The indicator lamp confirms to the person speaking that the microphone is active. Additional contacts on the ST‑LCR1 are available to turn on other indicators or recording devices. The ST‑GSP1 detection threshold is adjustable. Muting occurs 2 seconds after the audio level drops below the preset threshold. In circumstances where a longer delay time is desired, an external capacitor may be connected to extend the delay. The ST‑GSP1 line‑level output may be configured balanced or unbalanced to feed a variety of audio inputs.
POWERING MULTIPLE STICK-ONS FROM SINGLE SUPPLY Distributed dc Power From Current-Limited Switching Power Supply
POWERING MULTIPLE STICK-ONS FROM SINGLE SUPPLY
Distributed dc Power From Current-Limited Switching Power Supply
AN-2193
Description:
The low current consumption of STICK‑ON modules allows multiple modules to be powered from a single supply. The ST‑PD5U distributes power from any RDL current‑limited switching power supply to up to five modules with a total current requirement of 2 amperes or less. RDL 24 Vdc switching power supplies (purchased separately) are available with current ratings of 500 mA, 1 A and 2 A. All meet ENERGY STAR Level V standards.
FIXED MIXING OF PODIUM MIC AND LINE INPUTS Mixing a Microphone and Stereo Source to a Single Line
FIXED MIXING OF PODIUM MIC AND LINE INPUTS
Mixing a Microphone and Stereo Source to a Single Line
AN-2198
Description:
The sound system in this room is equipped with a mono balanced input from the floor box. When the podium is in use, the presenter uses the microphone and also uses an audio player or laptop computer. The ST‑UMX3 Universal Audio Mixer is installed to mix signals from a single dynamic microphone and the unbalanced stereo source located in the podium to a balanced mono mic‑level or line‑level (switch‑selectable) feed to the sound system input. The small size of the ST‑UMX3 allows it to be installed in the podium or the floor box. The ST‑UMX3 3X1 Universal Audio Mixer is used to combine signals of different level, impedance or balanced/unbalanced configuration. Each input and the output is switch‑selectable for mic or line level. Single‑turn trimmers are provided for the gain adjustment of each input.
SEQUENCE LOW VOLTAGE DC POWER AND AMPLIFIERS Eliminate Audio Pops During System Power-Up and Power-Down
SEQUENCE LOW VOLTAGE DC POWER AND AMPLIFIERS
Eliminate Audio Pops During System Power-Up and Power-Down
AN-2173
Description:
The RU‑SQ6A Sequencing Controller provides complete power distribution management in this sound system. Sequencing the power ON and OFF of the system avoids annoying and sometimes damaging thumps and pops by turning power amplifiers ON last and OFF first. In systems using large power amplifiers, the sequencing of power can also avoid high inrush currents during power up. The RU‑SQ6A features outputs for six sequential steps. The Timing Interval between steps may be adjusted between 1 and 10 seconds. Each step is provided with both Open Collector and SPST dry contact outputs. In this application Open Collector outputs are used to activate the TX‑PD8X Switching Power Supply Distributors that power numerous other RDL products while dry contact closures are used to activate OEM low voltage controllable mains power outlets. Remote ON/OFF control of the RU‑SQ6A is provided by a D‑RT2 Remote Control Selector. Visual indication of the ON/OFF status is provided on the remote control.
AUTOMATIC PROJECTOR SCREEN CONTROL Projector On/Off Status Converted to Up/Down Pulses to Control Motorized Projection Screen
AUTOMATIC PROJECTOR SCREEN CONTROL
Projector On/Off Status Converted to Up/Down Pulses to Control Motorized Projection Screen
AN-2186
Description:
Used with a projector that provides a contact closure or logic‑level voltage when powered on, the ST‑LCR3 Logic Controlled Relay provides a momentary contact closure to automatically lower the motorized projection screen. When the projector is powered off, the ST‑LCR3 provides a separate momentary contact closure to raise the screen. Additional ST‑LCR series modules may be triggered by the ST‑LCR3 SLAVE outputs to provide additional contact closures to control window shades and lighting presets for complete single‑button control of an AV system.
BLUETOOTH® AUDIO SOURCE IN A PUBLIC SPACE Wall-Mounted Bluetooth Input for Audio Player
BLUETOOTH® AUDIO SOURCE IN A PUBLIC SPACE
Wall-Mounted Bluetooth Input for Audio Player
AN-2253
Description:
One Format‑A receiver is used to feed stereo audio to the power amplifier. Bluetooth audio is sent to the receiver over CATx cable with RJ45 connectors. The Bluetooth wall module is powered by the Format‑A receiver through the CATx cable.
DISTRIBUTED AUDIO FOR EXERCISE FACILITY SourceFlex System Provides Individual Headphone Stations
DISTRIBUTED AUDIO FOR EXERCISE FACILITY
SourceFlex System Provides Individual Headphone Stations
AN-2088
Description:
Each piece of exercise equipment is outfitted with an RDL SAS‑HC8 Headphone Control Station so that users can select from eight audio programs and adjust volume to their own preference. Six audio sources in this system are associated with video monitors at the front of the room. A TX‑J2 Unbalanced Input Transformer is used to combine each stereo signal to mono. Two other channels are from radio or satellite receivers. The SAS‑8i Audio Input Chassis also provides an “all call” paging input.

The SAS‑8i supports four SourceFlex listening stations and multiple SourceFlex expansion chassis’. Listening station expansion may be added in groups of two with the SAS‑82 2 Station Audio Controller or in groups of eight with the SAS‑8C 8 Station Audio Controller. There is no practical limit to the number of listening stations in any system. Connections between the controller and each listening station use a multi‑conductor twisted‑pair cable. The SourceFlex system is reliable and cost effective without the problems of wireless systems with rechargable batteries.
CONSUMER TO PRO AUDIO FORMAT CONVERSION Stereo Unbalanced Audio Source Connects to Stereo Balanced Mixer Input
CONSUMER TO PRO AUDIO FORMAT CONVERSION
Stereo Unbalanced Audio Source Connects to Stereo Balanced Mixer Input
AN-2190
Description:
A portable podium is frequently used for presentations in this room. An ST‑UBA2 Unbalanced to Balanced Line Amplifier is installed in the floor box to convert the unbalanced stereo audio signal from a laptop computer or other consumer source to match the balanced stereo inputs of a professional mixer. Each channel is provided with installer‑adjustable gain and a Dual‑LED VU meter to simplify adjustment. A summed mono output is also available. The small size of the ST‑UBA2 permits it to be comfortably installed in a floor box.
DISTRIBUTED AUDIO FOR MASSAGE PARLOR SourceFlex System Provides Individual Room Source Selection and Volume Control
DISTRIBUTED AUDIO FOR MASSAGE PARLOR
SourceFlex System Provides Individual Room Source Selection and Volume Control
AN-2219
Description:
The SourceFlex audio system provides individual audio source selection and volume control in each area. An external power amplifier powers the speakers in the larger waiting room. The massage room speakers are powered by room amplifiers built in to the SourceFlex Decora‑style wall controls. Three sources are shown connected to the SAS‑8i rackmounted controller (CD player, Satellite receiver, MP3 player) which accommodates up to 8 selectable sources plus a paging input. Stereo sources are converted to mono using RDL TX‑J2 modules. A paging microphone is preamplified using an RDL STM‑1 to feed the SAS‑8i line‑level paging input. Clients select the source and set the volume on a D‑SFRC8 wall control with integrated 3.5 W RMS power amplifier. The receptionist selects the source and adjusts the volume in the larger lobby area. A D‑SFRC8L wall control is used to choose the audio source. It provides a line‑level output to an external RDL RU‑PA40D audio amplifier with integral VCA. An RDL D‑RLC10 rotary encoder‑type VCA control adjusts the lobby audio level. The reception station is equipped with a push‑to‑talk button used to page all the listening areas. The SAS‑8i Controller powers up to 4 listening stations, and provides connections to multiple SAS‑8C 8‑station expansion chassis. There is no practical limit to the number of possible listening zones.
SOURCEFLEX SYSTEM - Two Zones Two Room Tanning Salon
SOURCEFLEX SYSTEM - Two Zones
Two Room Tanning Salon
AN-2002
Description:
This application distributes program sources, typically music, to two (up to four) different zones using RDL’s SourceFlex system. The stereo outputs from two separate audio sources are converted to balanced mono signals using two RDL TX‑J2s. These signals feed SAS‑8i SourceFlex Audio Input Chassis inputs. The SAS‑8i allows the installer to set the maximum listening level at each station. Each tanning room has an SAS‑RC8 Room Control Station that allows customers to select a program source and adjust the audio level. The system shown accomodates up to eight audio sources and supports up to four zones. Additional zones may be added using available RDL control modules.
3 SELECTABLE MUSIC CHANNELS Audio Distribution with Source Selection and Local Decora-Style Active Loudspeaker
3 SELECTABLE MUSIC CHANNELS
Audio Distribution with Source Selection and Local Decora-Style Active Loudspeaker
AN-2227
Description:
styles of music are distributed throughout this office complex over a combination Danteâ„¢ audio network and RDL Format‑A distribution. An RU‑NFD Network to Format‑A Interface/Distributor is used to convert the networked audio sources to Format‑A. Audio and power is supplied to a source selector and active speaker in each office through a dedicated CATx cable. A D‑Series‑TPRX3A Source Selector and a D‑Series‑PSP1 Active Loudspeaker installed in each office allow the employees to listen to any of the three types of music.
DIFFERENT BGM SOURCES DISTRIBUTED TO 4 OFFICES Format-A Audio Distribution with Local Decora-Style Active Loudspeaker
DIFFERENT BGM SOURCES DISTRIBUTED TO 4 OFFICES
Format-A Audio Distribution with Local Decora-Style Active Loudspeaker
AN-2241
Description:
This multi‑source background music system uses RDL Format‑A products to simplify system design and installation. An RU‑TPS4A Active Sender / Distributor converts up to three conventional balanced or unbalanced analog audio signals to Format‑A and distributes the audio and operating power over a four pair UTP (CAT5 or better) cable to the four listening stations. Each listening station consists of a D SERIES‑PSP1A Decora‑Style Active Loudspeaker mounted in a single gang North American electrical box (or RDL WB‑1U international wall box). A rear‑panel switch set during installation selects which of the three audio sources is amplified by the powered speaker. The system is expandable to up to 160 listening stations using additional distribution amplifiers.
BASIC BACKGROUND MUSIC Simple Retail Space BGM System
BASIC BACKGROUND MUSIC
Simple Retail Space BGM System
AN-2134
Description:
The RDL HD‑PA35U 35 Watt Power Amplifier is equipped with a single unbalanced stereo summing input for connecting a background music source. This amplifier includes an analog compressor/limiter allowing it to produce clear audio output levels that normally require an amplifier with a much higher output power rating. The HD‑PA35U shuts down (standby “sleep” mode) when audio is absent and automatically turns on when needed. In this application, an RDL RLC10K Remote Level Control is provided to adjust the output level of the amplifier. This remote control is designed to be mounted in a standard US single gang electrical box (or RDL WB‑1U Universal Wall Box for international installations) with an RDL CP‑1 Cover Plate. Bass and Treble tone controls are provided on the amplifier front panel.
PRIORITIZED PAGING Paging from Multiple Locations
PRIORITIZED PAGING
Paging from Multiple Locations
AN-2016
Description:
This application provides multiple paging locations, with priority assigned to each location. Each location has a mic with a PTT (push‑to‑talk) momentary pushbutton that provides external switching contacts. The STM‑2 preamp for each microphone should be installed near the associated mic. Wiring between each STM‑2 output and the corresponding ST‑LCR1 is balanced, connected with shielded or unshielded twisted‑pair cable. When a PTT button associated with a microphone is depressed, the music fades down and paging becomes active. The highest priority mic overrides the lower priority mic(s). This arrangement may be carried out for an unlimited number of paging locations. If the background music source provides only unbalanced outputs, an STA‑1M Audio Line Amplifier may be used to provide a balanced signal at the proper level.

If solid state switching is preferred, an ST‑SSR1 Solid State Audio “Relay” may be substituted for each ST‑LCR1.

The FP‑PA20A 20 Watt Power Amplifier feeding 70 Volt speakers is used in this example. RDL offers a wide range of power amplifiers for paging and public address applications.
POWERING MULTIPLE SYSTEMS FROM ONE SUPPLY Remote ON/OFF Control Allows Users to Turn Systems On and Off
POWERING MULTIPLE SYSTEMS FROM ONE SUPPLY
Remote ON/OFF Control Allows Users to Turn Systems On and Off
AN-2172
Description:
The four separate sound systems are comprised of modules in the Equipment Rack powered by a single 24 Vdc power supply. Good engineering practice requires that the power wiring to each component originate at the power supply output. In this installation, the TX‑PD8X Switching Power Supply Distributor serves as the power source for the eight modules comprising the four systems. The TX‑PD8X is equipped with remote control terminals that provide for turning its eight outputs on or off. The wall‑mounted D‑RT2 Remote Control Selector allows users to control the TX‑PD8X, thereby turning the four systems on or off. Visual indication of the ON/OFF status is provided on the remote control. The TX‑PD8X is capable of distributing up to 2 Amps of 24 Vdc power to a maximum of eight dc power jacks from the corresponding RDL current‑limited switching power supply. A smaller RDL power supply may be used for systems with less total module current.
AUTOMATIC CONTROL OF RESTAURANT AV SYSTEM POWER Conserve Energy and Provide Unattended Operation
AUTOMATIC CONTROL OF RESTAURANT AV SYSTEM POWER
Conserve Energy and Provide Unattended Operation
AN-2107
Description:
The RDL FP‑ECC1 Energy Conservation Controller automatically powers up the electronics for this restaurant when needed and powers down the equipment when the restaurant is vacant to conserve energy and reduce operating costs. Motion sensors in the restaurant public areas trigger the FP‑ECC1 to switch on the system equipment power outlets. Continued activity in the seating areas will retrigger the FP‑ECC1 to keep the system turned on. After a switch‑selectable time period of 15, 30, or 60 minutes with no activity, the FP‑ECC1 will turn off the system electronics. No operator intervention is needed to turn the system on or off. An STM‑2 Microphone Preamplifier amplifies the reception desk paging microphone to line level. The associated push‑to‑talk switch causes the ST‑VP1 Voice‑Over/Paging Module to insert paging mic announcements through the house system. The D‑ECR1L Power On/Off Remote Control allows the system to be manually turned on and/or off. It also provides a system master level control to adjust the volume of the RU‑PA40D 40 Watt Stereo Power Amplifier.
BLUETOOTH WITH ADJACENT LINE INPUTS OVER CATx Format-A with CATx Cable Adds Separate Analog User Line Inputs to Wireless Bluetooth Source
BLUETOOTH WITH ADJACENT LINE INPUTS OVER CATx
Format-A with CATx Cable Adds Separate Analog User Line Inputs to Wireless Bluetooth Source
AN-2250
Description:
One Format‑A receiver is used to provide two mono line‑level signals to a local mixer‑amplifier in the equipment rack. Bluetooth audio is sent to the receiver on pair B. Pair C is used to receive mono‑summed audio through the Mini‑Jack or pair of RCA jacks mounted next to the Bluetooth receiver. Audio is connected from the Format‑A senders through CATx cable with standard RJ45 connectors. The use of Format‑A provides simple connection using CATx cable and the economy of a single receiver and power supply.
RF SUPPRESSION IN AUDIO OR CONTROL CIRCUITS RFI Suppressed on Six Signal Conductors
RF SUPPRESSION IN AUDIO OR CONTROL CIRCUITS
RFI Suppressed on Six Signal Conductors
AN-2177
Description:
The ST‑FS6 Ferrite Suppressor / RF Filter is used to attenuate excessive RF interference (RFI) induced in the wiring conductors by a nearby communications tower. The passive ST‑FS6 provides six isolated channels of highly effective ferrite RF suppression without capacitance to ground or series resistance. Two ground terminals are provided to be used as tie points for connecting cable shields (not pictured). The ground lugs have no internal connection to the suppression circuitry. Each of the six I/O terminals may be used independently for the suppression of RF on Audio, dc power or logic control signal conductors. RF interference on audio and control wiring causes unwanted audio noise or instability in control circuits. The ST‑FS6 is normally installed at the rack where signals are received. It is possible that interference may interfere with audio or control sending equipment, making it beneficial to install a suppressor module at both ends of the long interconnection lines.
PAGING DISTRIBUTION IN OFFICE COMPLEX Common Paging for Multi-Story Office Building
PAGING DISTRIBUTION IN OFFICE COMPLEX
Common Paging for Multi-Story Office Building
AN-2108
Description:
Installed UTP (unshielded CAT5, CAT6 or similar) cable can be used to distribute facility‑wide paging to multiple floors or zones. The facility paging source for this multiple story building is fed to the RDL TX‑TPS1A Active Single Pair Sender. Its output is fed to a twisted pair receiver on one floor, then in turn to additional receivers on the other floors. All connections use UTP terminated with RJ45 plugs. A TX‑TPR1A Active Single Pair Receiver on each floor delivers line‑level paging audio to the local amplifier. Each Format A twisted pair receiver bridges the UTP cable, allowing the source signal to continue on to multiple receivers. The receivers are powered from the TX‑TPS1A sender. (Note: If the total distances between the receivers exceeds the recommended cable length for the cable type used, one or more additional power supplies may be required. If needed, an additional power supply may be connected to any of the receiver modules. Consult the Format‑A twisted pair data, or RDL technical support for more information.)
AMPLIFICATION FOR OUTDOOR POLE-MOUNT SPEAKERS Pole Mounted Power Amp Operation in Extreme Temperatures
AMPLIFICATION FOR OUTDOOR POLE-MOUNT SPEAKERS
Pole Mounted Power Amp Operation in Extreme Temperatures
AN-2125
Description:
This outdoor parking area is equipped with speakers mounted in the lamp structures to provide music and paging coverage. Speakers in each pole are powered by an RDL FP‑PA18H 18 Watt Hi‑Temp Audio Amplifier. The amplifier module is mounted in an unventilated watertight enclosure at the base of each pole. The poles recieve direct sunlight causing the potential for high internal ambient air temperatures. The highly efficient FP‑PA18H is ideally suited to this environment. It is designed for operation in ambient temperatures up to 70 degrees Celsius (about 158 degrees Fahrenheit) and contributes negligible heat to the ambient temperature inside the pole. The amplifier’s integral compressor/limiter insures maximum intelligibility by keeping average power levels high and preventing clipping. The FP‑PA18H combines RDL's high audio performance standards with the capability of operation in harsh temperature environments. Notes: 1] If it is desired to monitor the operation of the complete system, the audio detector included in each FP‑PA18H can be wired back to the system audio rack to confirm that audio is being received and amplified at each pole. 2] If the FP‑PA18H is acquired with an RDL power supply, that supply must be located in an ambient environment not to exceed 40 degress C. FP‑PA18H modules are available without a power supply for use with high temperature supplies or in systems using distributed 24 Vdc power. Contact RDL Technical Support for more information.
DISTRIBUTED OUTDOOR SOUND User Audio Input Automatically Overrides House Audio in Local Zone
DISTRIBUTED OUTDOOR SOUND
User Audio Input Automatically Overrides House Audio in Local Zone
AN-2032
Description:
An unbalanced stereo audio signal from the house audio system is summed and converted to a balanced mono signal using the TX‑J2 Unbalanced Input Transformer. The ST‑ACR Audio Controlled Relay normally connects the house audio source to the FP‑PA20A 20 Watt Audio Power Amplifier which feeds 70 Volt outdoor loudspeakers in the patio seating area. The patio is equipped with a DS‑CIJ3 Consumer Input Jack plate to connect an unbalanced stereo audio source (RCA jacks or Mini‑jack, MP3 shown). When a source is connected and playing audio, the ST‑ACR2 detects the audio and switches the amplifier input from house audio to the connected source. The patio speakers will distribute the locally connected source as long as it is playing. When the local source is finished, the ST‑ACR2 switches back to the house audio. An FP‑PA20B 20 Watt 25 Volt Power Amplifier may be used in place of the FP‑PA20A if a 25 Volt system is desired.
PAGING DISTRIBUTION IN LARGE OFFICE COMPLEX Zoned Paging for Multi-Story Office Building
PAGING DISTRIBUTION IN LARGE OFFICE COMPLEX
Zoned Paging for Multi-Story Office Building
AN-2167
Description:
Installed UTP (unshielded CAT5, CAT6 or similar) cable is used to distribute facility‑wide paging to multiple floors or zones. The three paging sources for this multiple story building are fed to the RDL TX‑TPS3A Active Three Pair Sender. Its RJ45 output is fed to a twisted pair receiver on one floor, then in turn to additional receivers on the other two floors. By setting each TX‑TPR1A receiver to a different receive pair (A, B or C) each floor receives its own paging source. An All Call initiated at the main paging station will page all floors simultaneously. All connections use UTP terminated with RJ45 plugs. A TX‑TPR1A Active Single Pair Receiver on each floor delivers line‑level paging audio to the local amplifier. Each Format A twisted pair receiver bridges the UTP cable, allowing the source signal to continue on to multiple receivers. The receivers are powered from the TX‑TPS3A sender. (Note: If the total distances between the receivers exceeds the recommended cable length for the cable type used, one or more additional power supplies may be required. If needed, an additional power supply may be connected to any of the receiver modules. Consult the Format‑A twisted pair data, or RDL technical support for more information.)
DANTE INPUTS AND OUTPUTS IN THE WALL Meeting Room with Portable Active Loudspeakers
DANTE INPUTS AND OUTPUTS IN THE WALL
Meeting Room with Portable Active Loudspeakers
AN-2245
Description:
All audio processing in this meeting room is handled by a centrally‑located Dante‑enabled DSP. The RDL DD‑BN22 Bi‑Directional Mic/Line Dante Interface provides inputs for up to two microphones and analog outputs to feed the two portable active loudspeakers. Each XLR input provides three switches that are set from the front of the unit before the cover plate is installed. One switch enables or disables P48 phantom; the second switch selects the mic or line gain range; the third switch sets the gain. Rear‑panel switches set each XLR output to mic or line level.
FORMAT-A SOURCE SELECTOR & IN-WALL AMPLIFIER Distribute Three Audio Sources to Multiple Locations Over UTP Cable
FORMAT-A SOURCE SELECTOR & IN-WALL AMPLIFIER
Distribute Three Audio Sources to Multiple Locations Over UTP Cable
AN-2224
Description:
Three styles of music are distributed to various rooms in this facility over CAT 5 cable by an RU‑TPS4A Format‑A Active Sender / Distributor. A D Series‑TPRX3A Source Selector, D Series‑PA3 Audio Amplifier and D SERIES‑SP1A 8 Ohm loudspeaker installed in each room allow the occupants to listen to any of the three types of music provided or to listen to their own program material simply by plugging their MP3 player into the front‑panel input on the D‑PA3 amplifier. The front‑panel local input overrides the distributed audio. The D‑SP1A loudspeaker provides rich detailed sound in a compact Decora compatible format.
OFFICE AUDIO SYSTEM FOR ENHANCED PRODUCTIVITY Employee-Selectable Private (Headphone) or Public (Speaker) Monitoring of Two Office Sources
OFFICE AUDIO SYSTEM FOR ENHANCED PRODUCTIVITY
Employee-Selectable Private (Headphone) or Public (Speaker) Monitoring of Two Office Sources
AN-2170
Description:
Each office is equipped with two active stereo audio inputs that may be listened to via the overhead loudspeaker or through headphones. The local computer is connected to one input. The other input is available for a user‑supplied playback device, such as a Personal Media Player used for dictation, recorded meeting playback or music. Software alerts enabled on the computer will be heard along with the Personal Media Player playback because both audio inputs are active at all times. Confidential playback content remains private by turning off the overhead speaker and using the headphones powered by the DS‑HA1A Stereo Headphone Amplifier. Computer or Personal Media Player audio suited or intended to be heard in the whole office may be amplified to an appropriate listening level by the DS‑TPA1A 3.5 W Audio Power Amplifier.
DISTRIBUTED OUTDOOR SOUND User Audio Input And Level Control
DISTRIBUTED OUTDOOR SOUND
User Audio Input And Level Control
AN-2031
Description:
An unbalanced stereo audio signal (RCA jacks or Mini‑jack) from an external source (MP3 shown) is summed and converted to balanced mono using the DS‑CIJ3 Consumer Input Jack plate. An RDL FP‑PA20A 20 Watt Audio Power Amplifier feeds 70 Volt outdoor loudspeakers in the patio seating area. The wall‑mounted RLC10KS Remote Control allows users to adjust the audio level on the patio. The RLC10KS controls the ST‑VCA3 Voltage Controlled Amplifier which sets the audio input level to the power amplifier. An FP‑PA20B 20 Watt 25 Volt Power Amplifier may be used in place of the FP‑PA20A if a 25 Volt system is desired.
REMOTE SELECTION OF PRESET AUDIO LEVELS Retail Store
REMOTE SELECTION OF PRESET AUDIO LEVELS
Retail Store
AN-2093
Description:
The background music (BGM) audio for the retail store is connected to an ST‑VCA3 Voltage Controlled Amplifier that is controlled by an DS‑RLC3 Remote Level Control. The DS‑RLC3 features 4 preset levels, set by the installer, providing the retail staff with 4 different volume choices to accommodate varying ambient audio levels. The DS‑RLC3 is mounted in a single gang box with an RDL CP‑1S Stainless Steel Cover Plate. The audio from the ST‑VCA3 is routed to the FP‑PA35A Power Amplifier with Power Supply which powers the overhead speakers in the store. The FP‑PA35A features an integral audio compressor that controls clipping.
PASSIVE AUDIO COMBINING 10 KΩ Combiner Provides a Cost-Effective High-Impedance “Mixing” Solution
PASSIVE AUDIO COMBINING
10 KΩ Combiner Provides a Cost-Effective High-Impedance “Mixing” Solution
AN-2200
Description:
The STD‑10K Passive Divider / Combiner is used to combine the unbalanced stereo output of the media player to mono for connection to an unbalanced mono input on the mixer. The STD‑10K is a resistive branching network with four ports, each with RF filtering circuitry. Any port may be used as an input or an output. The impedance of each port on the STD‑10K is a nominal 10 kΩ. STD Divider / Combiner products may be wired for EITHER balanced or unbalanced operation. Balanced and unbalanced wiring may not be mixed on a single module.
NETWORKED AUDIO PAGING Multiple Paging Zones
NETWORKED AUDIO PAGING
Multiple Paging Zones
AN-2226
Description:
A Danteâ„¢ network is used to distribute several sources of facility‑wide paging to multiple buildings. Within each building (one is shown), networked audio is converted to RDL Format‑A for distribution to three floors using an RU‑NFD Network to Format‑A Interface/Distributor. Each paging source is routed to Format‑A Pair A, Pair B or Pair C through Dante Controller. The RU‑NFD provides three Format‑A output jacks that each send audio on pairs A, B & C to a twisted pair receiver on one floor, then in turn to additional receivers on the other two floors. By setting each TX‑TPR1A receiver to a different receive pair (A, B or C), each floor receives its own paging source. An All Call initiated at the main paging station will page all floors simultaneously. All connections use UTP terminated with RJ45 plugs. A TX‑TPR1A Active Single‑Pair Receiver on each floor delivers line‑level paging audio to the local amplifier. Each Format A twisted pair receiver bridges the UTP cable, allowing the source signal to continue on to multiple receivers. The receivers are powered from the RU‑NFD. (Note: If the total distances between the receivers exceeds the recommended cable length for the cable type used, one or more additional power supplies may be required. If needed, an additional power supply may be connected to any of the receiver modules. Consult the Format‑A twisted pair data, or RDL technical support for more information.)
AUDIO DISTRIBUTION OVER TWISTED PAIR Multi-Zone Paging w/BGM and Message Repeater
AUDIO DISTRIBUTION OVER TWISTED PAIR
Multi-Zone Paging w/BGM and Message Repeater
AN-2144
Description:

An RDL FP‑MR2 Message Repeater plays back pre‑recorded messages and provides ducking or muting of the BGM source during message playback. The message repeater can be programmed to repeat automatically or may be triggered manually. Two dynamic or condenser microphones are pre‑amplified to line‑level by an RDL HR‑MP2 Dual Microphone Preamplifier. All three audio sources (BGM/Message Repeater, Paging Mic 1, Paging Mic 2) are distributed to each of the three floors of an office or retail building over readily available CAT5 cabling utilizing an RDL RU‑TPS4A Active Sender/Distributor and three TX‑TPR3A Active Receivers (one per floor). Each Active Receiver provides line‑level audio to an RDL HD‑MA35A Mixer Amplifier. The BGM/Message Repeater signal connects to Input 2 of the mixer amplifier on each floor. Input 1 of each mixer amplifier is fed from the Receiver output that corresponds with the Paging Mic (1 or 2) that will be used to page on that floor. Input 1 is set to "duck" the other amplifier input(s) so paging will take priority.

The RDL Format‑A twisted pair products provide flexibility and expandability for this multi‑zone paging system. Additional floors may be added using additional receiving modules and amplifiers./

TWO ZONE PAGING SYSTEM Remote Switch at Paging Station Controls Solid-State Audio Routing to Proper Paging Zone
TWO ZONE PAGING SYSTEM
Remote Switch at Paging Station Controls Solid-State Audio Routing to Proper Paging Zone
AN-2192
Description:
The operator of the paging station can selectively page in either zone. The STM‑2X Switchable Low Noise Microphone Preamplifier amplifies the paging mic to line level. The preamp output is active only while the operator presses the mic push‑to‑talk button. The ST‑RX2 Audio Routing Switcher routes the line‑level audio signal to one of the two amplifiers. The NORMAL output feeds the Zone 1 amplifier; the SELECT output feeds Zone 2. The Audio Routing Switch at the operator’s station controls the ST‑RX2 TRIG terminal. When the ST‑RX2 TRIG control terminal is not connected to ground, audio is fed to the NORMAL output and the SELECT output is turned off. When the TRIG control terminal is grounded, the input audio is routed to the SELECT output and the NORMAL output is muted.
AUTOMATIC TIMED MESSAGE PLAYBACK Background Music With Message Repeater
AUTOMATIC TIMED MESSAGE PLAYBACK
Background Music With Message Repeater
AN-2142
Description:

The RDL FP‑MR2 Message Repeater stores a single recording up to one minute forty seconds in duration. The message is played back at regular intervals set on the front‑panel interval timer DIP switches.

An RDL TX‑J2 Unbalanced Input Transformer is used to sum and balance the stereo consumer output from the background music source. The TX‑J2 output is connected to the balanced music input of the FP‑MR2. When message playback is triggered, the music is faded down 20 dB or completely off (switch‑selectable on the FP‑MR2). At the conclusion of the message, the normal background music level is restored.

Amplification for 70V loudspeakers is provided by an RDL FP‑PA35A Audio Amplifier with compression. A computer or any other unbalanced line‑level source may be used to transfer a recorded message to the FP‑MR2.

COMMERCIAL PRIORITY PAGING SYSTEM Facility-wide Paging Interrupts Background Music System
COMMERCIAL PRIORITY PAGING SYSTEM
Facility-wide Paging Interrupts Background Music System
AN-2014
Description:
This system demonstrates how an auxiliary 70 V paging system can override the loudspeakers from a local 70 V background music system (BGM) using the TX‑PCR1 Paging Controlled Relay. In normal operation, the BGM 70 V speaker line will route through the normally closed contacts of the TX‑PCR1 to the local 70 V loudspeakers. The auxiliary 70 V system (in this case the Paging/Announcement System) feeds both the 70 V input and the normally open contacts on the relay unit (TX‑PCR1). When a signal is present on the auxiliary 70 V line, the relay unit senses the signal and throws the DPDT relay routing the auxiliary amplifier to the local loudspeakers.
BLUETOOTH® GYM AUDIO Separate Bluetooth Inputs in Two Zones Over Single CATx Cable Run
BLUETOOTH® GYM AUDIO
Separate Bluetooth Inputs in Two Zones Over Single CATx Cable Run
AN-2252
Description:
One Format‑A receiver is used to feed two independent zones of mono audio to two audio power amplifiers. The Bluetooth receiver in each zone sends audio to the Format‑A receiver through a daisy‑chained connection over CATx cable. Both Bluetooth interface modules are powered from the Format‑A receiver.
BACKGROUND MUSIC WITH MICROPHONE PAGING Simple Retail Space BGM System with Dual Microphone Paging
BACKGROUND MUSIC WITH MICROPHONE PAGING
Simple Retail Space BGM System with Dual Microphone Paging
AN-2135
Description:
In this application, an RDL HD‑MA35U 35 Watt Mixer Amplifier is used for background music and microphone paging. An RDL STD‑150 Passive Audio Combiner/Divider ‑ 150Ω combines signals from 2 dynamic or condenser microphones and feeds the paging input of the mixer amplifier. A background music source is inserted into any line‑level input. The Mixer Amplifier can be set to fade down (duck) the background music during a paging event. Automatic ducking is enabled usng the ducking selectors, sensitivity and release delay adjustments on the rear panel. An RDL RLC10K Remote Level Control is provided to adjust the output level of the amplifier. This remote control is designed to be mounted in a standard US single gang electrical box (or RDL WB‑1U Universal Wall Box for international installations) with an RDL CP‑1 Cover Plate. Bass and Treble tone controls are provided on the amplifier front panel.
LOCAL ZONE LEVEL CONTROL OF NETWORKED AUDIO Adapt Standard Audio Amplifiers to a Dante&trade Network
LOCAL ZONE LEVEL CONTROL OF NETWORKED AUDIO
Adapt Standard Audio Amplifiers to a Dante&trade Network
AN-2237
Description:
An FP‑NML2V Network to Mic/Line Interface with VCA receives two channels of Dante networked audio, one for each room or zone. The digital audio is converted to balanced audio to drive any standard amplifier. The FP‑NML2V incorporates a VCA in each audio output. Each VCA is controlled by a D‑RLC10 Remote Level Control in the zone. The D‑RLC10 is a rotary encoder style remote that provides a 0 to 10 Vdc control output. One FP‑PA35A Power Amplifier drives the speakers in each zone. The amplifier gain is fixed at the maximum level needed in the zone. Users adjust the audio level in the zone using the D‑RLC10. Because the level in the zone is adjusted by the FP‑NML2V, any standard audio amplifier may be used for each zone.
DANTE NETWORK INPUTS AND OUTPUTS IN THE WALL Briefing Room Mics and Near-Field Monitors
DANTE NETWORK INPUTS AND OUTPUTS IN THE WALL
Briefing Room Mics and Near-Field Monitors
AN-2247
Description:
All audio processing in this briefing room is handled by a centrally located Dante‑enabled DSP. The RDL DD‑BN2M Bi‑Directional Mic/Line Interface connects the two microphones and the two permanently installed D‑PSP1 Decora‑Style Active Loudspeakers to the Dante network. Each D‑PSP1 serves as a near‑field monitor and is fed from the line‑level outputs on the rear of the DD‑BN2M. Each XLR input provides three switches that are set from the front of the unit before the cover plate is installed. One switch enables or disables P48 phantom; the second switch selects the mic or line gain range; the third switch sets the gain.
DIFFERENT BGM SOURCES DISTRIBUTED TO 4 OFFICES Format-A Audio Distribution with Local Decora-Style Active Loudspeaker
DIFFERENT BGM SOURCES DISTRIBUTED TO 4 OFFICES
Format-A Audio Distribution with Local Decora-Style Active Loudspeaker
AN-2241
Description:
This multi‑source background music system uses RDL Format‑A products to simplify system design and installation. An RU‑TPS4A Active Sender / Distributor converts up to three conventional balanced or unbalanced analog audio signals to Format‑A and distributes the audio and operating power over a four pair UTP (CAT5 or better) cable to the four listening stations. Each listening station consists of a D SERIES‑PSP1A Decora‑Style Active Loudspeaker mounted in a single gang North American electrical box (or RDL WB‑1U international wall box). A rear‑panel switch set during installation selects which of the three audio sources is amplified by the powered speaker. The system is expandable to up to 160 listening stations using additional distribution amplifiers.
AUDIO INPUTS AND OUTPUTS IN THE PODIUM Networked with a Centrally-Located DSP
AUDIO INPUTS AND OUTPUTS IN THE PODIUM
Networked with a Centrally-Located DSP
AN-2246
Description:
The RDL DD‑BN2ML Wall‑Mounted Bi‑Directional Mic/Line Dante Interface provides all necessary audio connectivity for this meeting room and is networked with a centrally‑located Dante‑enabled DSP. The XLR input provides three switches that are set from the front of the unit before the cover plate is installed. One switch enables or disables P48 phantom; the second switch selects the mic or line gain range; the third switch sets the gain. The 3.5mm input sums the left and right channels of a stereo source to mono to feed one Dante network transmit channel. The two male XLR connectors on the D‑XLR2M wall plate are wired to the two line level outputs on the rear of the DD‑BN2ML to feed the two active loudspeakers. The DD‑BN2ML and D‑XLRM2 are shown mounted together in a triple‑gang RDL surface‑mounted box.
ROOM COMBINING IN FUNERAL HOME SPACE RCX-5C System Allows Flexible Use Of Facility
ROOM COMBINING IN FUNERAL HOME SPACE
RCX-5C System Allows Flexible Use Of Facility
AN-2001
Description:
An RCX Room Combining System allows independent audio systems in up to five separate zones to be combined as one single system or to be combined with one or more adjacent zones. The funeral home in this example has a public space that may be divided by partitions into two or three separate areas. Each of these three zones is equipped with an RCX‑2 Room Control to select between local audio sources or background music, and to adjust speaker volume in the zone. Local mic and/or line‑level audio sources connect through the RCX‑J3 Audio Input Plate. When partitions are opened, the RCX‑5C Controller is used to combine the audio inputs and controls to feed all the speakers in the combined area. The FP‑PA20A 20 Watt RMS Audio Power Amplifier drives 70 Volt speakers in each zone.
BLUETOOTH AND MICROPHONE INPUTS OVER CATx Format-A with CATx Cable Adds XLR Mic Input at Ideal Locations with Wireless Bluetooth Source
BLUETOOTH AND MICROPHONE INPUTS OVER CATx
Format-A with CATx Cable Adds XLR Mic Input at Ideal Locations with Wireless Bluetooth Source
AN-2251
Description:
One Format‑A receiver is used to provide two mono line‑level signals to a local mixer in the equipment rack. Bluetooth L + R summed mono audio is sent to the receiver on pair B. Pair C is used to receive line‑level audio from the Format‑A microphone preamplifier mounted in the room. Audio is connected from the Format‑A senders through CATx cable with standard RJ45 connectors. The use of Format‑A provides flexibility in the location of the senders, simple connection using CATx cable and the economy of a single receiver and power supply.
PRIORITIZED PAGING Automatic Ducking with Multiple Paging Locations
PRIORITIZED PAGING
Automatic Ducking with Multiple Paging Locations
AN-2062
Description:
This application provides multiple paging locations, with priority assigned to each location. Each location has a mic equipped with a PTT (push‑to‑talk) momentary pushbutton. The STM‑2 preamp for each microphone should be installed near the associated mic. Wiring between each STM‑2 output and the corresponding ST‑VP2 is balanced, connected with shielded or unshielded twisted‑pair cable. When any microphone is used, the music fades down and paging becomes active. The highest priority mic overrides the lower priority mic(s). This arrangement may be carried out for an unlimited number of paging locations.

The FP‑PA20A 20 Watt Power Amplifier feeding 70 Volt speakers is used in this example. RDL offers a wide range of power amplifiers for paging and public address applications.
STEREO AUDIO FORMAT CONVERSION Balanced Audio Amplification for Long Cable Runs between Unbalanced Equipment
STEREO AUDIO FORMAT CONVERSION
Balanced Audio Amplification for Long Cable Runs between Unbalanced Equipment
AN-2175
Description:
The STA‑1 Dual Balanced/Unbalanced Line Amplifier is used for conversion of an unbalanced stereo signal to balanced and to amplify the signal to a balanced +4 dBu for transmission over a long cable run. The STA‑1 is a dc coupled line‑level preamplifier that provides exceptional audio quality in any format conversion application. The TX‑A2D provides passive balanced to unbalanced conversion and transformer isolation of the stereo signal for connection to the ‑10 dBV inputs of a consumer amplifier.
PATIO AUDIO SYSTEM House Audio System with MP3 Player and 4 Outdoor Rock Loudspeakers
PATIO AUDIO SYSTEM
House Audio System with MP3 Player and 4 Outdoor Rock Loudspeakers
AN-2026
Description:
A stereo unbalanced audio signal from the house audio system is summed and converted to a balanced mono signal using the TX‑J2 Unbalanced Input Transformer. The patio is equipped with a DS‑CIJ3 Consumer Input Jack Decora® plate that provides connectivity for an MP3 music player or other stereo audio source. Source selection is controlled by the house audio system and volume is controlled using the house audio system and/or the MP3 player, if it’s in use. An RDL FP‑PA20A 20 Watt 70 Volt Audio Power Amplifier powers four 70 Volt outdoor rock speakers in a patio seating area. Each speaker is tapped at 5 Watts, for a total of 20 Watts. Using a 70 Volt system allows for the use of smaller cable sizes which reduce system costs and simplify the installation. An RDL FP‑PA20B 20 Watt 25 Volt Audio Power Amplifier may be used in place of the FP‑PA20A if a 25 Volt system is desired.
AUTOMATIC POWER CONTROL OF RETAIL AUDIO SYSTEM Conserve Energy and Save Cost by Automating System Power-Up and Power-Down
AUTOMATIC POWER CONTROL OF RETAIL AUDIO SYSTEM
Conserve Energy and Save Cost by Automating System Power-Up and Power-Down
AN-2109
Description:
To conserve energy and reduce operating costs, the RDL FP‑ECC1 Energy Conservation Controller is used to automatically power up the background music system in this retail store when needed and to power down the equipment when not needed. A magnetic switch on the door is used as a trigger to switch the system on. Once on, an occupancy sensor (motion detector) is used to monitor activity in the space and hold the system in a powered state. After a switch‑selectable time period of 15, 30 or 60 minutes of no activity (motion), the FP‑ECC1 will turn the BGM system off. No operator intervention is required to power the system on or off. A TX‑J2 is used to provide a balanced mono sum of the background music receiver output. The D‑ECR1L Power On/Off and Level Control Remote allows for manual power‑up/down operation of equipment controlled by the FP‑ECC1 and provides a convenient remote volume control for the RU‑PA40D 40 Watt Stereo Power Amplifier. Notes: 1] A larger audio amplifier may be used in larger systems; 2] If the RU‑PA40D is located with the BGM receiver, the TX‑J2 is not required.
AUDIO EQUALIZATION ENHANCES VOICE INTELLIGIBILITY AUDIO EQUALIZATION ENHANCES VOICE INTELLIGIBILITY
AUDIO EQUALIZATION ENHANCES VOICE INTELLIGIBILITY
AUDIO EQUALIZATION ENHANCES VOICE INTELLIGIBILITY
AN-2178
Description:
The ST‑EQ3 3 Band Equalizer shown in this paging system tailors the system for voice‑band intelligibility. The midrange control boosts the voice band (200 Hz to 7 kHz). Low and High band controls attenuate audio frequencies outside of the voice band. The center frequency of each of the three bands may be adjusted by +/‑ 12 dB. Note: The ST‑EQ3 is a cost‑effective module to enhance a variety of systems including adjustable “loudness” equalization for music in PA applications.
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