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USE A CATX HOME RUN FOR EACH FORMAT-A SOURCE Power Inserter / Signal Breakout Module Permits Home Run Cabling
USE A CATX HOME RUN FOR EACH FORMAT-A SOURCE
Power Inserter / Signal Breakout Module Permits Home Run Cabling
AN-2236
Description:
In this Format‑A installation, it was not practical to loop CATx cable between the senders in different rooms. A home run from each microphone sender was pulled to the equipment rack. The TX‑TP4PW Power Inserter / Signal Breakout module is used to connect Pairs A, B and C to a single cable run and to insert power. The sources sent on pairs A, B and C are all present on the cable that connects the TX‑TP4PW to the RJ45 input of the TX‑TPR3A Line‑Level Format‑A Receiver. All the Format‑A modules are powered by the external supply connected to the TX‑TP4PW

POWER 3 ACTIVE SPEAKERS ON FORMAT-A CABLE RUN Power Inserter / Signal Breakout Module Permits Home Run Cabling From a Dante™ Network
POWER 3 ACTIVE SPEAKERS ON FORMAT-A CABLE RUN
Power Inserter / Signal Breakout Module Permits Home Run Cabling From a Dante™ Network
AN-2234
Description:
Each Format‑A active loudspeaker requires 100 mA of supply current. A TX‑TP4PW Power Inserter / Signal Breakout module provides up to 200 mA to each D‑PSP1A active loudspeaker. The TX‑TP4PW Power Inserter / Signal Breakout module is used to receive Pairs A, B and C from a single cable run connected to the RJ45 output of the RU‑BNF Format‑A Bi‑Directional Network Interface. The RU‑BNF converts 3 Dante sources to Format‑A. Those sources on pairs A, B and C are all passed through to each home run cable that connects to the RJ45 input of each D‑PSP1A Format‑A loudspeaker. A rear‑panel switch set during installation selects which of the three audio sources is amplified by the powered speaker. All D‑PSP1A loudspeakers may be set to the same pair if desired. All the Format‑A modules are powered by the external supply connected to the TX‑TP4PW. This setup can be replicated for the remaining two Format‑A outputs from the RU‑BNF. Additionally, the Format‑A input on the RU‑BNF may be used to convert three Format‑A sources onto the Dante network (not shown).

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.

CUSTOMERS PLAY PERSONAL AUDIO IN PUBLIC HOUSE BGM Audio System with Wall-Mounted Customer Input for Personal Audio Player CUSTOMERS PLAY PERSONAL AUDIO IN PUBLIC HOUSE
CUSTOMERS PLAY PERSONAL AUDIO IN PUBLIC HOUSE
BGM Audio System with Wall-Mounted Customer Input for Personal Audio Player CUSTOMERS PLAY PERSONAL AUDIO IN PUBLIC HOUSE
AN-2182
Description:
This establishment normally provides patrons with background music from a consumer CD player. Two inputs of the ST‑MX3 Line Level Mixer are used to combine the left and right channels of the CD player’s unbalanced stereo output. On special occasions, customers are encouraged to play music from their personal media players through the house system using a wall‑mounted D‑CIJ3 Consumer Input Jack Panel. The D‑CIJ3 combines the customer’s stereo source to a balanced mono signal that feeds the third balanced input of the mixer module. The local CD player is simply turned off (or paused) when the personal media player is in use.

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.

AUDIO FOR DIGITAL SIGNAGE Conversion of Speaker Circuits to Line Level for High Fidelity Amplification
AUDIO FOR DIGITAL SIGNAGE
Conversion of Speaker Circuits to Line Level for High Fidelity Amplification
AN-2147
Description:
Video monitors in public spaces often include speakers with insufficient fidelity and/or volume. Such flat panels typically offer only speaker level outputs. This application couples good quality speakers with RDL modules to fill the space with full fidelity audio. The only audio outputs on the flat screen are speaker‑level outputs. Each output channel is fed to the input of an RDL TX‑8A Adjustable Line Transformer which attenuates the signal to a standard balanced (or unbalanced) line level. The line‑level signals are amplified by a pair of ST‑PA18 18 W RMS Power Amplifiers to drive quality loudspeakers. The loop out of each ST‑PA18 is fed to one of the summing inputs on the ST‑CX2S Subwoofer Filter. The ST‑CX2S combines the left/right channels and applies the subwoofer low‑pass crossover. The ST‑CX2S output feeds an ST‑PA18 which is used to drive a subwoofer. This application is often installed on flat panels that have audio amplifier power ratings that should be sufficient for the space if they applied to each channel and were usable RMS power. The ST‑PA18 modules employ integral aurally transparent compression to deliver more of the modules’ average power to the speakers, often producing astounding fidelity when compared against the amplifier/speaker combination in the source flat panel.

MEDIA FEED DISTRIBUTION Buffering Multiple High Quality Audio Feeds
MEDIA FEED DISTRIBUTION
Buffering Multiple High Quality Audio Feeds
AN-2140
Description:
Speeches, government meetings, product announcements and other media events covered by reporters require multiple high quality audio feeds in the press room. The recording equipment may require a balanced or unbalanced line level or mic‑level signal. Each output feed must be isolated so that if one output is accidentally shorted or back‑fed, all other feeds and the public address system remain unaffected. An RDL RU‑ADA4D Audio Distribution Amplifier provides isolated audio output signals that drive a variety of audio jacks on a "Media Panel." An RDL RU‑MX4 Professional 4‑Input Mixer with selectable compressor is used to mix the audio sources. The line‑level mix is distributed by the RU‑ADA4D to up to 8 line‑level outputs on RCA, 1/4" phone, or XLR jacks. Three of its outputs are padded down to mic level using RDL TX‑LM2 line‑level to microphone‑level transformers. All jacks shown are on Decora® compatible wall plates. These jacks are also available in the RDL AMS series should a custom rack or tabletop configuration be preferred. Video distribution may be added using RDL composite and VGA/XGA distribution amplifiers.

SIMPLE MIC SWITCH FOR ANNOUNCE BOOTH TALENT Push-to-Talk and ON AIR Indicator Controlled by a Single Pushbutton
SIMPLE MIC SWITCH FOR ANNOUNCE BOOTH TALENT
Push-to-Talk and ON AIR Indicator Controlled by a Single Pushbutton
AN-2188
Description:
The talent can easily and silently switch the microphone on or off in the announce booth. The ST‑LCR2 Alternate Action Relay is triggered by a Momentary Pushbutton Control Switch to turn the microphone on and to control the visual indicator. A single push of the button latches the ST‑LCR2 relay ON and a second push turns it OFF. One set of the dry relay contacts is used to turn the “ON AIR” sign ON/OFF while the second set may be used to control other indicators or functions. The SLAVE output of the ST‑LCR2 is connected to the CTRL input of the STM‑2X to activate the preamplifier output. Note that an STM‑2X output may be connected to either the mic or line input of the studio mixer.

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.

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.

REMOTE CONTROLLED MIXING IN A SPORTS ARENA Mixer Input Levels Are Remote-Controlled From Timekeeper's Box
REMOTE CONTROLLED MIXING IN A SPORTS ARENA
Mixer Input Levels Are Remote-Controlled From Timekeeper's Box
AN-2028
Description:
RDL’s Twisted Pair Connector Plates and Remote Controlled Mixer are ideal for this hockey rink or other sports arenas announcement system. The straightforward design makes the system easy to understand and operate for the timekeeper. RDL D‑TPS1A and D‑TPS7A input plates located inside the timekeeper’s box send a local microphone and a line level audio source (Computer, MP3, CD or DVD player) to the first two channels of the FP‑TPX3A Remote Controlled Mixer in the amplifier rack. The third mixer channel is fed from another D‑TPS1A located near the ice, providing a microphone input close to the action. Installing the D‑RC3M Remote Mixing Control within arm’s reach allows the timekeeper to easily adjust levels and mute any of the sources. The FP‑TPX3A incorporates an audio detector and timer that can be used to turn off the power amplifiers when the system is not being used, resulting in substantial energy savings. The mixer inputs and the remote control are all connected using common UTP cable such as CAT5 with standard RJ45 connectors.

KARAOKE SYSTEM Microphone Compressor and Power Amplifier
KARAOKE SYSTEM
Microphone Compressor and Power Amplifier
AN-2139
Description:
This example shows the use of the RDL EZ‑MCP1 Microphone Compressor and the RDL HD‑PA35U Power Amplifier in a Karaoke system. The EZ‑MCP1 is an in‑line device that connects between a dynamic or condenser microphone and the mic‑level input of the Karaoke machine. When properly adjusted, it will produce consistent audio levels despite wide variations of up to 30 dB from the microphone and will control signal overloads that cause distortion and clipping. The output of the HD‑PA35U Power Amplifier is rated at 35 W RMS into a 4Ω or 8 Ω load. The included analog compressor/limiter allows the amplifier to produce audio output levels and clarity normally expected from amplifiers with a much higher output rating. Additionally, the amplifier includes Sleep Mode circuitry that puts the amplifier into standby mode after a predetermined period of time with no audio at the input. The presence of signal at the input causes the HD‑PA35U to return to full operation.

ISOLATED MEDIA FEEDS Buffering Multiple High Quality Audio Feeds
ISOLATED MEDIA FEEDS
Buffering Multiple High Quality Audio Feeds
AN-2009
Description:
Speeches, government meetings, product announcements and other media events are occasions where a number of reporters in the electronic press require a high quality audio feed from the event organizers. The recording equipment in use might require a mic, balanced line level or unbalanced line‑level signal. It is critical that each feed is isolated so that if one feed is accidentally shorted or back‑fed, no other feed will be affected nor will the public address system. This example uses RDL STICK‑ONs® to provide isolated audio output signals driving a variety of audio jacks on a "Media Panel." An RDL RU‑MX4 Pro 4‑Input Mixer is used as the audio source. The line‑level source is distributed through an ST‑DA3 Audio Distribution Amplifier to line‑level outputs on RCA, 1/4¨ phone, and XLR jacks. The same source is padded down to mic level using an STP‑1 Attenuator and distributed through an STM‑DA3 Microphone Distribution Amplifier to the mic outputs. All jacks shown are on Decora® wall plates. These jacks are available in the RDL AMS series should a rack or tabletop mount be preferred. Distribution of video at these events can also be added using RDL composite and VGA/XGA distribution 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.

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.

LIVE SOUND Distribution of Digital Audio to Digital Amps in a Live-Sound Venue
LIVE SOUND
Distribution of Digital Audio to Digital Amps in a Live-Sound Venue
AN-2055
Description:
This system uses a digital audio distributor to route the venue audio out to multiple digital amplifiers. Any of the outputs of the HR‑DDA4 can be switched to provide S/PDIF (coaxial or optical), AES/EBU, or AES3ID formats.

DISTRIBUTED VGA VIDEO TO MULTIPLE MONITORS Hotel Provides Multiple Video Monitors that Display Daily Schedule of Events
DISTRIBUTED VGA VIDEO TO MULTIPLE MONITORS
Hotel Provides Multiple Video Monitors that Display Daily Schedule of Events
AN-2090
Description:
The daily Calendar of Events listing at this hotel is generated from an office computer. An RDL EZ‑VM14 distributes the VGA signal of the schedule display to three monitors located near the entrances of the hotel meeting rooms. The wide bandwidth of the EZ‑VM14 insures that the same high resolution image seen at the local monitor is seen at each hotel monitor.

KIOSK SOUND SYSTEM Amplified Audio for Indoor or Outdoor Information Booth
KIOSK SOUND SYSTEM
Amplified Audio for Indoor or Outdoor Information Booth
AN-2112
Description:
An RDL TX‑J2 Unbalanced Input Transformer provides a balanced mono audio source from the computer in this information kiosk. The FP‑PA18H 18 Watt Mono High Temperature Audio Amplifier provides ample power to drive the 8 Ohm speaker. Its integral compressor/limiter provides consistent levels for enhanced intelligibility without clipping. The ST‑PA18H is rated for operation between 0 and 70 degrees C (158 degrees F) so that it can operate comfortably when used in a space that is not temperature controlled.

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.

DIGITAL SIGNAGE Audio and Video Distribution for Digital Signage Applications over CAT5
DIGITAL SIGNAGE
Audio and Video Distribution for Digital Signage Applications over CAT5
AN-2060
Description:
This RDL Format‑C twisted pair system allows for the distribution of both audio and composite video over a standard CAT5 cable. This simplifies and speeds up system installation by allowing one economical cable to deliver both audio and video signals. The Format‑C sender in the data closet feeds the audio and video to receivers mounted behind each flat panel display. Twisted pair cables loop from one receiver to the next. A Format‑C distributor would allow for configurations with multiple distribution branches.

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

7.1 SURROUND SOUND REMOTE LEVEL CONTROL Multi-Channel Level Control for Theater or Control Room
7.1 SURROUND SOUND REMOTE LEVEL CONTROL
Multi-Channel Level Control for Theater or Control Room
AN-2160
Description:
The RU‑VCA6A (6 channel) and RU‑VCA2A (2 channel) Digitally Controlled Attenuators are arranged in a MASTER/SLAVE configuration to allow single point level control of the 7.1 surround sound source feeding the amplifiers. Either VCA module may serve as master. This application uses an RLC10K Remote Level Control to control the RU‑VCA6A. The RU‑VCA6A control output port is connected to the control input of the RU‑VCA2A, which is set to slave mode. The RU‑VCA2A follows the level setting of the RU‑VCA6A. Multiple VCA modules may be slaved from a single master module. The RU‑VCA6A and RU‑VCA2A offer clickless level adjustment, accurate tracking and outstanding wide‑band, low‑noise studio quality performance. They can be operated remotely by a variety of RDL single or multi‑point controls, third party controllers and/or locally via front‑panel pushbuttons. Each audio input and output may be wired balanced or unbalanced. The RU‑VCA6A and the RU‑VCA2A may be used independently in 5.1 surround and stereo systems.

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.

SOURCEFLEX SYSTEM FOR ARENA BOX SEATING Distributed Audio System Provides Source Selection In Multiple Zones
SOURCEFLEX SYSTEM FOR ARENA BOX SEATING
Distributed Audio System Provides Source Selection In Multiple Zones
AN-2007
Description:
Attendees select the audio source and listening level in their seating box using a wall‑mounted SAS‑RC8 Room Control Station. Three sources are available for selection in each seating box: Stadium Broadcast Audio, MP3 music or the Press Feed. The SourceFlex system accommodates a maximum of 8 possible sources, plus one paging input. Mono sources are connected to the rack‑mounted SAS‑8i Audio Input Chassis. Stereo sources are converted to mono using RDL TX‑J2 modules. All control, power and audio signals connect through a single wiring cable between each SAS‑RC8 and the SAS‑8i. A line‑level output from each wall control is amplified by an FP‑PA20A 20 Watt Power Amplifier to two or more 70 V loudspeakers. An internal amplifier in the SAS‑RC8 may be used to drive 8 Ohm speakers in seating requiring up to 1.5 Watts. The SAS‑8i supports a maximum of four separate seating box zones and provides connection of multiple expansion chassis: SAS‑82 Two Station Controllers and SAS‑8C Eight Station Controllers. There is no practical limit to the number of possible zones. SourceFlex wall controls are available in several styles to match any décor.

LONG DISTANCE TWISTED-PAIR VIDEO MONITORING Camera at Top of Ski Lift Monitored at Ski Lodge Security Office
LONG DISTANCE TWISTED-PAIR VIDEO MONITORING
Camera at Top of Ski Lift Monitored at Ski Lodge Security Office
AN-2114
Description:
The security camera at the top of the ski lift feeds an RDL TX‑TPS1C Active Three Pair Sender. At the end of about one mile of twisted pair cable, a TX‑TPR3C Twisted Pair Receiver feeds the video monitor in the security office. The TX‑TPR3C is set to terminate the twisted pair cable. GAIN and EQ controls are adjusted to compensate for cable losses. Note: Two audio pairs are also available on the RDL Format C modules. No audio is shown in this application; the audio channels could be used to provide talk‑back capability from the upper lift operator station.

5.1 SURROUND SOUND REMOTE LEVEL CONTROL Multi-Channel Level Control for Theater or Control Room
5.1 SURROUND SOUND REMOTE LEVEL CONTROL
Multi-Channel Level Control for Theater or Control Room
AN-2159
Description:
The RU‑VCA6A Six Channel Digitally Controlled Attenuator and RLC10K Remote Level Control are used to increase and decrease the level of the 5.1 Surround Sound source feeding the amplifiers. The RU‑VCA6A 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‑VCA6As and/or RU‑VCA2As may be linked together for single‑point level control of 7.1, 10.2 or 22.2 surround sound systems.

LINE LEVEL MEDIA FEED DISTRIBUTION Buffering High Quality Audio Feeds
LINE LEVEL MEDIA FEED DISTRIBUTION
Buffering High Quality Audio Feeds
AN-2141
Description:
Speeches, government meetings, product announcements and other media events covered by reporters require multiple high quality audio feeds in the press room. The recording equipment may require a balanced or unbalanced line level or mic‑level signal. Each output feed must be isolated so that if one output is accidentally shorted or back‑fed, all other feeds and the public address system remain unaffected. An RDL RU‑ADA8D Audio Distribution Amplifier provides isolated audio output signals that drive a variety of audio jacks on a "Media Panel." An RDL RU‑MX4 Professional 4‑Input Mixer with selectable compressor is used to mix the audio sources. The line‑level mix is distributed by the RU‑ADA8D to up to 16 line‑level outputs on RCA, 1/4" phone, or XLR jacks. Any of these outputs could be padded down to mic level using RDL TX‑LM2 line‑level to microphone‑level transformers. All jacks shown are on Decora® compatible wall plates. These jacks are also available in the RDL AMS series should a custom rack or tabletop configuration be preferred. Video distribution may be added using RDL composite and VGA/XGA distribution amplifiers.

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.

REMOTE SWITCHING OF SPEAKER-LEVEL SIGNALS Noise Mitigation at an Outdoor Restaurant Patio
REMOTE SWITCHING OF SPEAKER-LEVEL SIGNALS
Noise Mitigation at an Outdoor Restaurant Patio
AN-2174
Description:
At this restaurant, the outdoor patio loudspeakers are required to be turned off when no customers are seated there. The ST‑LCR1H High Power Logic Controlled Relay is capable of switching up to 500 W of amplified audio. The D Series‑RT2 Remote Control Selector is used to operate the ST‑LCR1H from a secure location. The ST‑LCR1H connects or disconnects the outdoor speakers. The D‑RT2 provides visual ON and OFF indication of the outdoor speakers.

JUKEBOX OVERRIDES BACKGROUND SOURCE Line-Level Controlled Relay Provides Automatic Operation
JUKEBOX OVERRIDES BACKGROUND SOURCE
Line-Level Controlled Relay Provides Automatic Operation
AN-2024
Description:
One of the common uses for the ST‑ACR2 Audio Controlled Relay is to provide switching when a priority audio source is active. In this example the priority source is the jukebox which shares the same audio system as the background music source. The ST‑ACR2 samples line level audio from the jukebox and switches the audio input to the power amplifier from the jukebox when it senses audio from the jukebox.

The RDL TX‑PA40D 40 W Stereo Audio Power Amplifier is shown in this system.

AMUSEMENT PARK ATTRACTION AUDIO Real-Time Audio Special Effect Playback and Amplification
AMUSEMENT PARK ATTRACTION AUDIO
Real-Time Audio Special Effect Playback and Amplification
AN-2155
Description:
In an amusement park's Haunted Mansion ride, pre‑recorded screams on the FP‑MR2 Message Repeater are triggered by a motion sensor's contact closure in real time when the "victims" enter a particular room. The eerie background music is ducked when the message is played and restored after completion. The FP‑MR2 is fed into an RU‑PA40D Power Amplifier. The amplifier feeds two loudspeakers. Volume is adjusted by an RLC10KS Level Control.

3 CHANNEL SELECTABLE BGM Audio Distribution with Source Selection and Local Decora-Style Active Loudspeaker
3 CHANNEL SELECTABLE BGM
Audio Distribution with Source Selection and Local Decora-Style Active Loudspeaker
AN-2242
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 one D SERIES‑TPRX3A Three‑Input Format‑A Source Selector and one D SERIES‑PSP1 Decora Style Active Loudspeaker. Both products are mounted in a dual‑gang North American electrical box (or RDL WB‑2U international wall box). The system is expandable to up to 160 listening stations using additional distribution amplifiers.

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.

4 x 1 STEREO AUDIO SOURCE SELECTION Remotely Select From Four Stereo Audio Sources and Control Level in Lounge or Restaurant
4 x 1 STEREO AUDIO SOURCE SELECTION
Remotely Select From Four Stereo Audio Sources and Control Level in Lounge or Restaurant
AN-2210
Description:
The RU‑ASX4DR Remote Controlled Audio Selector allows patrons of this establishment to enjoy a variety music sources or the opportunity to watch and listen to television broadcasts. The D‑RC4M Four Channel Remote Control and D‑RLC10M Remote Level Control allow the staff to select the desired program source and to adjust the audio level. Sources may be muted by simply de‑selecting the active input at the D‑RC4M or by pressing the MUTE button on the D‑RLC10M. The D‑CIJ3D Consumer Input Jack panel is used to balance the stereo signal of an MP3 player and to provide galvanic isolation.

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.)

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.

PRIORITIZED PAGING Automatic Ducking with Multiple Paging Locations
PRIORITIZED PAGING
Automatic Ducking with Multiple Paging Locations
AN-2080
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.

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.

ELIMINATE HUM BARS AT A REMOTE VIDEO MONITOR Galvanic Isolation for Composite Video “Ground Loop”
ELIMINATE HUM BARS AT A REMOTE VIDEO MONITOR
Galvanic Isolation for Composite Video “Ground Loop”
AN-2097
Description:
A video source distributed to remote viewing areas such as public transport waiting areas or overflow meeting rooms is easily degraded by “ground loops”. The difference in ground voltage between the video source and monitoring locations can create herringbone patterns or rolling hum bars. Small “ground loop” voltages can easily impair the quality of a 1 Volt video signal. The RDL EZ‑HK2 at the monitor location removes the “ground loop” using a high quality video transformer in a shielded metal enclosure. The input jack is ground‑isolated. A ground‑lift switch allows the output jack shield to be lifted from the metal chassis if required.

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