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BASIC TWO ROOM COMBINING SYSTEM School Cafetorium Room Combining System with Automatic Audio Leveling Compression
BASIC TWO ROOM COMBINING SYSTEM
School Cafetorium Room Combining System with Automatic Audio Leveling Compression
AN-2124
Description:
This cafetorium can be used as one large room or as two smaller rooms formed by movable wall partitions. Each room has one mic and one mono or stereo line‑level input connection through a DS‑J3 input plate. EZ‑MCP1 Microphone Compressors provide consistent level and overload protection on the mic inputs. ST‑CL2 Compressor/Limiters provide the same benefits for the line inputs. The DS‑RCX2 Room Controls provide volume control in each room and allow selection of a common external source (typically background music). The RCX‑5C controls the audio system configuration, separating or combining the inputs and amplified audio to the speakers according to the room usage (one large room or two smaller rooms). The paging input overrides the audio in the entire cafetorium. Note: The RCX‑5C can be used for room combinations from two to five rooms. An HD‑PA35UA Audio Power Amplifier is used for each zone in this system to feed 70 Volt speakers. The HD‑PA35UA has an automatic sleep mode that shuts off the power amplifier when it is not in use. This offers significant energy savings for systems not operated by technical staff.
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./

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.
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.
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.
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.
MIX MIC SOURCES IN A ROOM TO ONE DANTE™ CHANNEL Expand the Capacity of a Single Dante Channel Using a Format-A Three-Pair Combiner
MIX MIC SOURCES IN A ROOM TO ONE DANTE™ CHANNEL
Expand the Capacity of a Single Dante Channel Using a Format-A Three-Pair Combiner
AN-2231
Description:
The TX‑TPSA1A Three‑Pair Combiner to Single‑Pair Sender is used to add up to two additional sources to one pair in a Format‑A system. Each of the three D‑TPS1A single‑pair microphone senders is set to feed a unique pair (A, B or C). These senders are daisy chained on one CATx cable run connected to the INPUT of the TX‑TPSA1A combiner where the three pairs are summed to feed Pair A. The TX‑TPSA1A output feeds an RDL RU‑FN Format‑A to Dante Interface. Microphones connected to any of the mic‑input senders will be sent on the first Dante output channel. Two D‑TPSL1A single‑pair senders (set to feed pairs B and C) are looped together on a second cable run connected to the LOOP IN of the combiner. These sources will be sent independently on the second and third Dante channels. DC power connected to the TX‑TPSA1A powers all five senders. Note: Up to three TX‑TPSA1A modules may be daisy chained on one cable run, permitting as many as nine senders to feed audio through a single Format‑A cable and to be sent on three Dante network channels.
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.
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.
PRESENTATION AUDIO Constant Voltage Distributed System
PRESENTATION AUDIO
Constant Voltage Distributed System
AN-2069
Description:
The constant voltage speaker system makes it easy to distribute audio throughout a facility. Speakers can be placed above the listeners tapped for appropriate power levels totalling up to the total amplifier capacity. The TX‑J2 is used to provide a balanced mono signal from the projector’s unbalanced stereo output. For this conference room, the FP‑PA20A constant‑voltage (70 or 100 Volt) amplifier provides up to 20 Watts RMS to speakers located directly above the seating area. The integral compressor/limiter allows high average power levels of audio free from clipping and distortion. The FP‑PA20A can be used in applications that previously would have required amplifiers rated for much higher power levels.

In this example, the amplifier is feeding four speakers at equal power levels. The 70 Volt system makes it easy to distribute audio so that clear, intelligible audio is available for all listeners.
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.
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.

NOISE MASKING WITH PAGING Constant Voltage System for Noise Masking and Overhead Paging
NOISE MASKING WITH PAGING
Constant Voltage System for Noise Masking and Overhead Paging
AN-2136
Description:
Random white noise generated by the ST‑NG1 White and Pink Noise Generator is fed to Input 2 of the HD‑MA35A Mixer Amplifier. A Paging Source is connected to Input 1 of the HD‑MA35A. The Mixer Amplifier can be programmed to attenuate (duck) the white noise by 25dB during a paging event. Ducking can be initiated either manually, from a contact closure on the paging device, or automatically by adjusting the Input 1 VOX sensitivity on the HD‑MA35A. The ST‑NG1 is powered directly from the 24 Vdc output on the rear of the HD‑MA35A.
DISTRIBUTE COMPUTER VIDEO SIGNALS TO MULTIPLE DISPLAYS 1x4 VGA through QXGA Distribution
DISTRIBUTE COMPUTER VIDEO SIGNALS TO MULTIPLE DISPLAYS
1x4 VGA through QXGA Distribution
AN-2079
Description:
Waiting rooms, airport terminals, dispatch centers, and operations hubs are just a few of the locations where multiple monitors of computer generated video are needed. The EZ‑VMD4 provides one local monitor plus three monitor outputs. Outputs offer wide RGB bandwidth for superb graphics reproduction and high resolution compatibility from VGA through QXGA. Front panel switches allow ID BIT selection and selection of TTL or Video 75 Ω sync. The compact size of the EZ‑VMD4 allows the use of this professional quality distribution amplifier even when equipment space is limited.

The EZ‑VMD4 is shipped with a high‑efficiency power supply that connects to a locking dc power jack.
COMBINE THREE SOURCES ON ONE FORMAT-A PAIR Expand the Capacity of a Format-A Cable Run Using a Three-Pair Combiner
COMBINE THREE SOURCES ON ONE FORMAT-A PAIR
Expand the Capacity of a Format-A Cable Run Using a Three-Pair Combiner
AN-2232
Description:
The TX‑TPSA1A Three‑Pair Combiner to Single‑Pair Sender is used to add up to two additional sources to one pair in a Format‑A system. Each of the three D‑TPS1A single‑pair microphone senders is set to feed a unique pair (A, B or C). These senders are daisy chained on one CATx cable run connected to the INPUT of the TX‑TPSA1A combiner where the three pairs are summed to feed Pair A. Two D‑TPSL1A single‑pair senders (set to feed pairs B and C) are looped together on a second cable run connected to the LOOP IN of the combiner. All three pairs are present at the OUTPUT which can be connected to any RDL Format‑A receiver, distributor or compatible Dante interface. DC power connected to the TX‑TPSA1A powers all five senders. Note: Up to three TX‑TPSA1A modules may be daisy chained on one cable run, permitting as many as nine senders to feed audio through a single Format‑A cable (three sources on each pair A, B and C)
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.
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.

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.
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.
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.
NEAR FIELD OR HEADPHONE SELECTED SOURCE MONITOR Courtroom Judge Selects from Three Sources to Feed Active Loudspeaker or Headphones
NEAR FIELD OR HEADPHONE SELECTED SOURCE MONITOR
Courtroom Judge Selects from Three Sources to Feed Active Loudspeaker or Headphones
AN-2229
Description:
The D SERIES‑PSP1 Decora‑Style Active Loudspeaker is ideal for use as a near field monitor in courtrooms, legislative chambers and conference facilities. In this courtroom the three main microphones, Prosecution, Defense and Witness, feed the courtroom’s audio system. Each mic source is preamplified to line level and fed into a TX‑TPS3A Format‑A three‑pair sender which sends the three signals to the judge’s bench over UTP cable. A D‑TPRX3A three‑pair selector receives the audio; the judge selects the desired source via the front‑panel pushbuttons. The D‑TPRX3A selector is mounted in a DC‑3W three‑gang Decora desktop chassis along with a D‑HPA3 3.5 watt power amplifier and a D‑SP1A loudspeaker. Speaker volume is adjusted using the front‑panel control on the amplifier. The D‑HPA3 can be set during installation to mute the speaker amplifier when headphones are plugged in. If the judge has difficulty hearing the speaker, headphones may be connected for better intelligibility and/or to block out unwanted noise.
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.
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.
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.
OBSERVATION ROOM AUDIO MONITOR Loudspeaker or Headphone Listening Station for Microphones Positioned in An Observation Room
OBSERVATION ROOM AUDIO MONITOR
Loudspeaker or Headphone Listening Station for Microphones Positioned in An Observation Room
AN-2218
Description:
Two microphones positioned in the observation room are preamplified and mixed by the ST‑MX2 audio mixer. The line‑level output of the mixer is amplified by the D‑HPA3 3.5 watt power amplifier to feed a wall‑mounted loudspeaker. The D‑HPA3 includes a separate headphone amplifier. The speaker amplifier is set (rear‑panel switch) to mute the speakers when headphones are connected. The front‑panel volume knob controls both the power amplifier and the headphone amplifier level. The high‑impedance bridging input on the D‑HPA3 allows the audio output of the mixer to also feed a recording device.
NEAR FIELD MONITORING OF SELECTED SOURCE Courtroom Judge Selects from Three Sources to Feed Active Loudspeaker
NEAR FIELD MONITORING OF SELECTED SOURCE
Courtroom Judge Selects from Three Sources to Feed Active Loudspeaker
AN-2230
Description:
The D SERIES‑PSP1 Decora‑Style Active Loudspeaker is ideal for use as a near field monitor in courtrooms, legislative chambers and conference facilities. In this courtroom the three main microphones, Prosecution, Defense and Witness, feed the courtroom’s audio system. Each mic source is preamplified to line level and fed into a TX‑TPS3A Format‑A three‑pair sender which sends the three signals to the judge’s bench over UTP cable. A D‑TPRX3A three‑pair selector receives the audio; the judge selects the desired source via the front‑panel pushbuttons. The D‑TPRX3A selector is mounted in a DC‑2W two gang Decora desktop chassis along with a D‑PSP1 active loudspeaker equipped with a front‑panel level control.
AUTOMATIC RAMP OF ALARM SIGNAL Voltage Controlled Attenuator Controls Alert Activation Tone Bursts and Receiver Noise
AUTOMATIC RAMP OF ALARM SIGNAL
Voltage Controlled Attenuator Controls Alert Activation Tone Bursts and Receiver Noise
AN-2042
Description:
The RU‑VCA2A Local/Remote Controlled Audio Attenuator has an internal ramp generator which makes it ideal for switch or relay‑operated level control. In this example, the ST‑ACR1 Line‑Level Audio Controlled Relay is used to operate the RU‑VCA2A so that the activation tones sent at the start of the fire dispatch transmission are fed at reduced volume to the speakers. Full volume is reached in time for the alert message. When an alert tone is first received, the ST‑ACR1 senses audio and causes the RU‑VCA2A to ramp up the audio level. After the message is finished, the audio level is returned to minimum. The RU‑VCA2A allows front‑panel setup of both ramp up and ramp down rates. The combination of the ST‑ACR1 and RU‑VCA2A prevents random receiver noise or activation tones from bursting at full volume through the fire station sound system.
CORPORATE CONFERENCE/PRESENTATION CENTER Laptop Audio, Wireless Mic System, 3 Channel Mixing with 20 Watt Amplifier
CORPORATE CONFERENCE/PRESENTATION CENTER
Laptop Audio, Wireless Mic System, 3 Channel Mixing with 20 Watt Amplifier
AN-2018
Description:
The EZ‑MXA20 provides a microphone preamp, mixer, limiter, tone control, and a stereo power amplifier in a package less than six inches wide. The EZ‑MXA20 handles sound reinforcement whether the audio source is a computer, CD player, live presenter or all three. The power amplifier provides 10 Watts per channel into 8 Ohm speakers or 8 Watts per channel into 4 Ohm speakers. Bass and treble tone controls provide equalization of source material. The limiter controls overloads from clipping the amplifier and an LED on the front panel of the EZ‑MXA20 indicates when the limiter is active.
PRESENTATION AUDIO Quality Audio System for Boardroom or Conference Room
PRESENTATION AUDIO
Quality Audio System for Boardroom or Conference Room
AN-2070
Description:
Many projectors incorporate source switching and audio level adjustment into their remote controls. They seldom offer a high quality audio power amplifier suitable for a large boardroom or conference room. The TX‑PA40D fills that need. A stereo amplifier with integral compressor/limiter, the TX‑PA40D is capable of maintaining high average audio power levels free from clipping and distortion. There is an input switch to sum the stereo inputs for those facilities where speaker placement does not allow for good stereo imaging.

In this example, the amplifier is feeding two pairs of 8 Ohm speakers so that four speakers can be used to evenly distribute the audio throughout the room. The compact footprint of the TX‑PA40D allows it to be mounted to the projector or other convenient location. This compact, professional amplifier may be mounted in just a few square inches of space.
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.
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.
SEND UNBALANCED AUDIO OVER A LONG DISTANCE Balanced Audio Connections Between Stereo Unbalanced Devices
SEND UNBALANCED AUDIO OVER A LONG DISTANCE
Balanced Audio Connections Between Stereo Unbalanced Devices
AN-2095
Description:
Unbalanced audio is not suited to long distance transmission due to susceptibility to hum and ground loops. This problem is avoided by balancing the audio source prior to transmission and by isolating the received signals with effective common mode (hum) rejection. This application uses an RDL STA‑2A Dual Line Amplifier to boost the unbalanced stereo source up to the standard +4 dBu level to drive a pair of balanced lines. The balanced lines may be shielded or unshielded (UTP) and may be up to several hundred feet long. An RDL TX‑A2D Dual Audio Converter receives the balanced audio, converts it to unbalanced and attenuates it to a standard ‑10 dBV level feeding RCA output jacks. Studio quality audio transformers in the TX‑A2D provide very high common‑mode hum rejection and galvanic isolation from the balanced lines. The received remote source is connected to one of the stereo unbalanced inputs of an RDL EZ‑MX4L stereo audio mixer that feeds the conference room amplifiers and speakers.
OBSERVATION ROOM AUDIO MONITOR Loudspeaker or Headphone Listening Station for Microphones Positioned in An Observation Room
OBSERVATION ROOM AUDIO MONITOR
Loudspeaker or Headphone Listening Station for Microphones Positioned in An Observation Room
AN-2223
Description:
Two microphones positioned in the observation room are preamplified and mixed by the ST‑MX2 audio mixer. The line‑level output of the mixer is amplified by the D‑HPA3 3.5 watt power amplifier to feed a D‑SP1A Decora‑Style loudspeaker. The D‑HPA3 includes a separate headphone amplifier. The speaker amplifier is set (rear‑panel switch) to mute the speakers when headphones are connected. The front‑panel volume knob controls both the power amplifier and the headphone amplifier level. The high‑impedance bridging input on the D‑HPA3 allows the audio output of the mixer to also feed a recording device.
DISTRIBUTED AUDIO IN MULTI-LINGUAL COURTROOM Participants Listen to Translations using SourceFlex System
DISTRIBUTED AUDIO IN MULTI-LINGUAL COURTROOM
Participants Listen to Translations using SourceFlex System
AN-2008
Description:
The RDL SourceFlexâ„¢ system distributes up to eight audio sources to any number of listening locations. The audio rack in this courtroom provides the sources of translated testimony and proceedings to feed the SourceFlex system inputs. Each SAS‑HC8 Headphone Amplifier allows a participant to select between the language being spoken or its simultaneous translation in another language and to adjust the listening volume to a comfortable level. Four listening stations (shown) may be connected directly to the SAS‑8i Audio Input Chassis. System expansion is easy using an RDL SAS‑8C 8 Station Audio Controller which supports eight more listening stations (not pictured). There is no practical limit to the total possible number of listening stations that can be connected in a single SourceFlex system. Connections to the listening stations are wired using a six conductor cable, avoiding the reliability and/or evesdropping issues of wireless distributed audio systems. The hard‑wired physically secure distribution limits use of the audio material to locations that are intentionally connected.
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).
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.
NOISE MASKING Two-Zone Noise Masking System for Office Space
NOISE MASKING
Two-Zone Noise Masking System for Office Space
AN-2039
Description:
This application shows the layout of a two zone noise masking system. The white noise line output from the RDL ST‑NG1 feeds the inputs of two RDL FP‑PEQ3 parametric equalizers. The FP‑PEQ3 equalizers allow the installer to flatten the noise spectrum in each zone. The line output of each FP‑PEQ3 is fed through RDL FP‑PA20A 20W, 70/100 V power amplifiers. The 70 V output of each FP‑PA20A feeds multiple 70 V speakers in its associated zone. Multiple equalizers and amplifiers may be added for larger systems with more zones.
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.
MEETING ROOM MIXER WITH NO SETUP REQUIRED Remote Controlled Mixer Provides User Adjustment in Multi-Purpose Space
MEETING ROOM MIXER WITH NO SETUP REQUIRED
Remote Controlled Mixer Provides User Adjustment in Multi-Purpose Space
AN-2085
Description:
The RDL FP‑TPX3A Remote Controlled Mixer makes setup easy for a wide variety of uses in this hotel meeting space. A visit to the AV closet is not required when shifting from one use to the next. The three FP‑TPX3A inputs are fed from any of the Format‑A twisted pair senders. Each Format‑A input module provides one balanced microphone input. (Line‑level Format‑A input modules are also available.) The three input modules are chained together and connected to the mixer using standard twisted pair cable with RJ45 connectors. A separate twisted pair cable connects the D‑RC3M Remote Mixing Control to the mixer. The D‑RC3M provides a separate level control and mute button for each of the three inputs. The wall mounted control is simple to use and easy to understand even for facility users with no technical background. The FP‑TPX3A provides a solution for flexible use of multi‑purpose rooms that does not require technically trained staff for setup.
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.)
CONSISTENT LEVELS FROM MEETING ROOM MICS Automatic Microphone Level Control for Enhanced Intelligibility with Untrained Presenters
CONSISTENT LEVELS FROM MEETING ROOM MICS
Automatic Microphone Level Control for Enhanced Intelligibility with Untrained Presenters
AN-2150
Description:
In this meeting room rack, three HR‑MCP2’s are connected between microphone inputs and the system’s DSP based microphone auto‑mixer to reduce demands on the DSP’s resources while providing consistent levels from each of the system’s six microphone inputs. The HR‑MCP2 improves sound quality and intelligibility by producing consistent audio levels and controlling overloads that produce distortion and clipping at the DSP inputs. The RDL HR‑MCP2 is a dual channel microphone compressor that produces consistent audio output levels over wide variations (up to 25 dB) in microphone input levels. Rear‑panel switches allow setting each output to mic or line level. Each channel can therefore be used as a mic‑level in‑line compressor or as a microphone preamplifier with compression. The HR‑MCP2 is compatible with dynamic and condenser microphones. Front‑panel switches are provided to enable low‑cut filters and 15 dB pads for each channel as well as global 48 Vdc phantom power. A CLIP LED flashes if a signal peak is within 1 dB of clipping. A seven LED metering string displays the instantaneous gain reduction in 3 dB increments.
MIXING THREE PHANTOM-POWERED MICROPHONES Simple Three Mic Mixing Solution
MIXING THREE PHANTOM-POWERED MICROPHONES
Simple Three Mic Mixing Solution
AN-2036
Description:
The mixing of multiple phantom‑powered mics is often required in various stage or public meeting room installations. The STD‑150 mixes the mic signals equally and passes phantom voltage generated by the mic preamp back to each of the mics. Each mic should have the same gain and should operate from a wide range of phantom voltage, as there is a small phantom voltage loss through the STD‑150. The STM‑3 works well in most applications but for critical, low noise installations the FP‑MP1 is recommended. The gain of the three microphones is set on the STM‑3. If individual mic gain adjustment is desired, use the RDL FP‑MX4 (4 channel ultra‑low‑noise mixer with switchable phantom and gain for each mic).
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.
TABLE-TOP PRESENTATION PERSONAL MONITOR SYSTEM Automatic Attenuation Avoids Feedback Between Pick-Up Mic and Monitor Speaker
TABLE-TOP PRESENTATION PERSONAL MONITOR SYSTEM
Automatic Attenuation Avoids Feedback Between Pick-Up Mic and Monitor Speaker
AN-2205
Description:
This sound system is designed to provide clear communication between two presenters and an assembled group. The two presenter positions are each equipped with a table‑top microphone and loudspeaker. The loudspeakers allow the presenters to clearly hear questions from the audience as well as each other. The audience microphone and the two presenter microphones are mixed in the rack; a line‑level signal feeds the amplifiers for the house and the table‑top loudspeakers. Each RDL ST‑GSP1 Gated Speech Preamplifier provides an automatically‑switched line‑level output from a microphone. When an ST‑GSP1 preamplifier is gated ON, the SLAVE (open‑collector) output mutes its associated ST‑MA2 Monitor Amplifier (and RU‑SP1 Monitor Speaker) and attenuates the adjacent monitor speaker, thereby preventing feedback. (Terminals on the ST‑MA2 can MUTE or provide 3 dB or 6 dB of attenuation while pulled to ground, permitting this wiring method to be expanded to multiple presenter stations.)
USE A CATX HOME RUN FOR EACH FORMAT-A SOURCE Power Inserter / Signal Breakout Module Permits Home Run Cabling to Dante™ Network
USE A CATX HOME RUN FOR EACH FORMAT-A SOURCE
Power Inserter / Signal Breakout Module Permits Home Run Cabling to Dante™ Network
AN-2233
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 RU‑FN format‑A to Network Interface. Each of the three sources will be transmitted on a separate Dante channel. All the Format‑A modules are powered by the external supply connected to the TX‑TP4PW.
ZONE AUTOMATIC PAGING LEVEL CONTROL Automatic Stepped Level Adjustment for Ambient Level Changes
ZONE AUTOMATIC PAGING LEVEL CONTROL
Automatic Stepped Level Adjustment for Ambient Level Changes
AN-2030
Description:
The circuit shown is ideal in applications where paging levels are normally sufficient, but at times high ambient noise levels make the paging impossible to hear. This is common in factories where heavy machinery is in use at some times, making higher sound system levels necessary while the machinery is operating, then restoring the normal level when the machinery is no longer running.

In this example, the STP‑1 Universal Audio Attenuator is used to set two audio levels (normal and high) for the line‑level audio feeding the power amplifier for the machinery room. A sensing microphone is oriented to pick up machinery noise but not paging audio. Machine noise triggers the ST‑ACR1M which switches the higher audio input level to the amplifier. In the absence of machine noise, the ST‑ACR1M switches back to the standard paging level. An RDL TX‑70A Speaker Level Interface can be added to obtain line‑level paging audio from a constant voltage speaker line.

An RDL FP‑PA20A Power Amplifier is used in this example.
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.
AUDIO DISTRIBUTION IN A LANGUAGE LAB Computer Audio, Instructor Microphone, Multiple Headphone Listening Stations
AUDIO DISTRIBUTION IN A LANGUAGE LAB
Computer Audio, Instructor Microphone, Multiple Headphone Listening Stations
AN-2019
Description:
In this system, a computer audio signal and a microphone signal are mixed using the RU‑MX4 Pro Audio Mic/Line Mixer. The mixed signal is distributed to multiple headphone listening stations in a language learning lab using an RU‑ADA4D Audio Distribution Amplifier. Each listening station features a D‑SH1 stereo headphone amplifier, which includes an integrated level control. Each D‑SH1 is mounted in a DC‑1G desktop chassis. The DC‑1G is constructed from steel and powder coated to provide years of durability in a classroom environment. The design of the D‑SH1 headphone amplifier makes it easy to create systems with an unlimited number of headphone listening stations. Either 1/4” or 1/8” (D‑SH1M) stereo headphone jack options are available. The system design is shown in mono but stereo configurations can be implemented just as easily.
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.
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