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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.
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.
KSU/PBX ZONE PAGING 2-Zone Paging System for Office Space
KSU/PBX ZONE PAGING
2-Zone Paging System for Office Space
AN-2063
Description:
This example shows how to utilize telephone line (input) ports on an existing KSU to add two zones of paging from the telephone system. The ST‑TC1 acts as a virtual phone line when interfaced with a KSU FX port. When either “line” is selected using any phone instrument connected to the KSU, the associated ST‑TC1 provides an audio path from the instrument mouthpiece to the paging amplifier. In this example two FP‑PA20A 70 volt amplifiers are powering 70 Volt loudspeakers in the two office areas. The ST‑TC1 provides relay contact closures when it is activated by a telephone instrument. The relay contacts can be used to provide additional functions when paging is active, including visual indicators or triggering a radio transmitter.
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.
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.
DANTE INPUTS AND OUTPUTS IN THE WALL Meeting Room with Portable Active Loudspeakers
DANTE INPUTS AND OUTPUTS IN THE WALL
Meeting Room with Portable Active Loudspeakers
AN-2245
Description:
All audio processing in this meeting room is handled by a centrally‑located Dante‑enabled DSP. The RDL DD‑BN22 Bi‑Directional Mic/Line Dante Interface provides inputs for up to two microphones and analog outputs to feed the two portable active loudspeakers. Each XLR input provides three switches that are set from the front of the unit before the cover plate is installed. One switch enables or disables P48 phantom; the second switch selects the mic or line gain range; the third switch sets the gain. Rear‑panel switches set each XLR output to mic or line level.
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.
AUDIO FORMAT CONVERSION Interfacing Consumer Components with a Balanced Professional Mixer
AUDIO FORMAT CONVERSION
Interfacing Consumer Components with a Balanced Professional Mixer
AN-2146
Description:
The RDL RU‑AFC2 Stereo Audio Format Converter provides bi‑directional interface between unbalanced consumer and balanced professional audio formats. The audio fidelity, low noise, low distortion and excellent crosstalk performance of the RU AFC2 are ideally suited to the most critical applications. The RU‑AFC2 receives the unbalanced stereo output from the CD player and converts it to professional balanced +4 dBu to feed a mixing console input. The balanced stereo mixer output is converted by the RU‑AFC2 to an unbalanced ‑10 dBV signal feeding the analog inputs of the digital audio recorder.
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.
FOUR FREQUENCY AUDIO TEST TONE SELECTION Selectable Audio Frequencies on aTechnician’s Workbench for Equipment Testing and Calibration
FOUR FREQUENCY AUDIO TEST TONE SELECTION
Selectable Audio Frequencies on aTechnician’s Workbench for Equipment Testing and Calibration
AN-2213
Description:
The ST‑OSC2A and ST‑OSC2B Dual Audio Oscillators are installed on this audio practitioner’s workbench to produce stable sine waves at four distinct frequencies. The RU‑ASX4D stereo 4X1 Audio Switcher provides the technician with a convenient means of selecting any of the 4 available tones which are used for level calibration and frequency response checks. The combination of the ST‑OSCA and ST‑OSCB provides tones at 100 Hz, 400 Hz, 1 kHz and 10 kHz. The level of each tone is adjustable between OFF and +14 dBu and is accurately maintained by integral AGC circuits. The output may be connected to balanced or unbalanced loads.
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.
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.
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.
HIGH QUALITY HEADPHONE LISTENING STATION Professional Stereo Headphone Amplifier with Level Control
HIGH QUALITY HEADPHONE LISTENING STATION
Professional Stereo Headphone Amplifier with Level Control
AN-2191
Description:
Two RDL ST‑VCA3 Voltage Controlled Amplifiers are used to adjust the audio level using an RDL AMS‑10K Linear Potentiometer at the listening location. Audio does not pass through the potentiometer, assuring years of scratch‑free adjustment. The RDL ST‑SH2 Stereo Headphone Amplifier drives headphones of any impedance (8 ohms or high impedance) from consumer or professional audio sources. The exceptional low noise (better than 100 dB below operating level), low distortion, audio clarity and excellent crosstalk performance makes this module ideally suited to a wide variety of demanding audio applications. The AMS‑1/4F is a female ¼” stereo phone jack which is mounted together with the AMS‑10K to an RDL D‑D2 Double Plate installed in an RDL DC‑1G Surface Mount Box. The installation is completed with an RDL CP‑1 Cover Plate.
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.
INDIVIDUAL PERSONAL AUDIO MONITORS Headphone Distribution in Broadcast and Voice-Over Studios
INDIVIDUAL PERSONAL AUDIO MONITORS
Headphone Distribution in Broadcast and Voice-Over Studios
AN-2164
Description:
RDL Format‑A series twisted pair products simplify the distribution of stereo audio to multiple headphone monitors in the broadcast studio. A single (standard 4 pair) UTP cable run allows the TX‑TPS3A to feed stereo audio and power to the D‑HA1A Headphone Amplifiers. Up to six D‑HA1A may be connected to one TX‑TPS3A Audio Sender. In this system the Headphone Amplifiers are housed in DC‑1G Desktop Chassis’. The all‑steel DC‑1G and CP‑1Cover Plate sport a durable powder‑coated finish for a handsome appearance over many years of service.
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.
BROADCAST QUALITY DIGITAL AUDIO DISTRIBUTION News Room Announce Microphone Digitally Distributed to Four Control Rooms
BROADCAST QUALITY DIGITAL AUDIO DISTRIBUTION
News Room Announce Microphone Digitally Distributed to Four Control Rooms
AN-2151
Description:
The four broadcast studio control rooms located in the same building all receive a news feed from the local “News Room Studio” announce booth. The RDL HR‑MP2 Dual Channel Microphone Preamplifier produces line‑level audio from the news room microphone(s) to feed the RDL HR‑ADC1 Analog to Digital Audio Converter. Its digital output is connected to the RDL HR‑DDA4 Digital Audio Distributor which delivers an isolated digital audio feed to each control room. The format of each digital output is switch‑selectable AES/EBU, S/PDIF coaxial, or AES‑3ID. The HR‑ADC1, HR‑DDA4 and HR‑MP2 are rack mountable using optional RDL rack adapters. All three units may be powered from the same RDL 1000 mA 24 Vdc supply. Note that if stereo microphones are used in the announce booth, the equipment shown can preamplify and distribute both channels to the four control rooms.
DANTE NETWORK INPUTS AND OUTPUTS IN THE WALL Briefing Room Mics and Near-Field Monitors
DANTE NETWORK INPUTS AND OUTPUTS IN THE WALL
Briefing Room Mics and Near-Field Monitors
AN-2247
Description:
All audio processing in this briefing room is handled by a centrally located Dante‑enabled DSP. The RDL DD‑BN2M Bi‑Directional Mic/Line Interface connects the two microphones and the two permanently installed D‑PSP1 Decora‑Style Active Loudspeakers to the Dante network. Each D‑PSP1 serves as a near‑field monitor and is fed from the line‑level outputs on the rear of the DD‑BN2M. Each XLR input provides three switches that are set from the front of the unit before the cover plate is installed. One switch enables or disables P48 phantom; the second switch selects the mic or line gain range; the third switch sets the gain.
STUDIO HEADPHONE MONITOR DISTRIBUTION Four Channel Audio Distribution for Individual Audio Monitoring via Headphones
STUDIO HEADPHONE MONITOR DISTRIBUTION
Four Channel Audio Distribution for Individual Audio Monitoring via Headphones
AN-2053
Description:
This example shows a four channel audio distribution system. The system uses a compact, studio quality, stereo audio distribution amplifier to feed four separate headphone amplifiers. The headphone amplifiers have individual volume controls for easy user adjustablility. The output amplifiers deliver more than 50 mW into either high or low impedance headphones through a durable, metal ¼" (6.3 mm) headphone jack.
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.
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./

OFFICE AUDIO SYSTEM FOR ENHANCED PRODUCTIVITY Employee-Selectable Private (Headphone) or Public (Speaker) Monitoring of Two Office Sources
OFFICE AUDIO SYSTEM FOR ENHANCED PRODUCTIVITY
Employee-Selectable Private (Headphone) or Public (Speaker) Monitoring of Two Office Sources
AN-2170
Description:
Each office is equipped with two active stereo audio inputs that may be listened to via the overhead loudspeaker or through headphones. The local computer is connected to one input. The other input is available for a user‑supplied playback device, such as a Personal Media Player used for dictation, recorded meeting playback or music. Software alerts enabled on the computer will be heard along with the Personal Media Player playback because both audio inputs are active at all times. Confidential playback content remains private by turning off the overhead speaker and using the headphones powered by the DS‑HA1A Stereo Headphone Amplifier. Computer or Personal Media Player audio suited or intended to be heard in the whole office may be amplified to an appropriate listening level by the DS‑TPA1A 3.5 W Audio Power Amplifier.
DISTRIBUTED LINE LEVEL FROM STUDIO MIC PREAMP Three Distributed Line-Level Outputs from a Single Microphone in a Voice-Over Studio
DISTRIBUTED LINE LEVEL FROM STUDIO MIC PREAMP
Three Distributed Line-Level Outputs from a Single Microphone in a Voice-Over Studio
AN-2183
Description:
The STM‑LDA3 Studio Quality Mic Preamp with Distributed Outputs is used in this voice‑over studio to bring the microphone signal to line level and distribute it to several different pieces of equipment. Designed for use in applications such as broadcast, recording and professional sound reinforcement, the STM‑LDA3 provides low‑noise, low‑distortion performance in a small, economical package. The 1200 Ω balanced input accepts a wide variety of microphone input levels from professional, low‑impedance dynamic and condenser microphones without loading the microphone. A multi‑turn trimmer provides for precise gain adjustment which is simplified with th
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.
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).
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.
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.
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.
PASSIVE AUDIO COMBINING 10 KΩ Combiner Provides a Cost-Effective High-Impedance “Mixing” Solution
PASSIVE AUDIO COMBINING
10 KΩ Combiner Provides a Cost-Effective High-Impedance “Mixing” Solution
AN-2200
Description:
The STD‑10K Passive Divider / Combiner is used to combine the unbalanced stereo output of the media player to mono for connection to an unbalanced mono input on the mixer. The STD‑10K is a resistive branching network with four ports, each with RF filtering circuitry. Any port may be used as an input or an output. The impedance of each port on the STD‑10K is a nominal 10 kΩ. STD Divider / Combiner products may be wired for EITHER balanced or unbalanced operation. Balanced and unbalanced wiring may not be mixed on a single module.
AUDIO INPUTS AND OUTPUTS IN THE PODIUM Networked with a Centrally-Located DSP
AUDIO INPUTS AND OUTPUTS IN THE PODIUM
Networked with a Centrally-Located DSP
AN-2246
Description:
The RDL DD‑BN2ML Wall‑Mounted Bi‑Directional Mic/Line Dante Interface provides all necessary audio connectivity for this meeting room and is networked with a centrally‑located Dante‑enabled DSP. The XLR input provides three switches that are set from the front of the unit before the cover plate is installed. One switch enables or disables P48 phantom; the second switch selects the mic or line gain range; the third switch sets the gain. The 3.5mm input sums the left and right channels of a stereo source to mono to feed one Dante network transmit channel. The two male XLR connectors on the D‑XLR2M wall plate are wired to the two line level outputs on the rear of the DD‑BN2ML to feed the two active loudspeakers. The DD‑BN2ML and D‑XLRM2 are shown mounted together in a triple‑gang RDL surface‑mounted box.
CONSISTENT LEVELS FROM STUDIO MICROPHONES Automatic Microphone Level Control in Broadcast and Voice-Over Studios
CONSISTENT LEVELS FROM STUDIO MICROPHONES
Automatic Microphone Level Control in Broadcast and Voice-Over Studios
AN-2148
Description:
One channel of the RDL HR‑MCP2 Dual Microphone Compressor is connected in‑line between each talent studio microphone and the mixer. The HR‑MCP2 automatically adjusts the volume for best intelligibility for a wide range of presenters’ speaking styles, from soft‑spoken to excited. Phantom voltage (IEC Standard 48 Volt) may be provided by the HR‑MCP2 to power any condenser microphone. The HR‑MCP2 provides transparent audio level adjustment and compression over a 25 dB range. It insures freedom from clipping and overload distortion, providing consistent audio levels throughout a broadcast and/or from one guest to the next. A single HR‑MCP2 provides automatic gain reduction for the two separate microphones, host and guest. Front‑panel LED metering strings simplify proper gain adjustment to produce the desired amount of normal and overload gain reduction. Without the HR‑MCP2, dynamic level extremes caused by untrained guests who become excited or suddenly approach the microphone can cause clipping in the mixer and require adjustment by the board operator. Installation of an HR‑MCP2 ahead of the mixer input prevents overload clipping and provides consistent levels to the mixer. The HR‑MCP2 is ideal for studio use as well as for crowd and audience microphones. The output of each HR‑MCP2 channel may be set to provide either mic or line level to the 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.
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.
RENTAL STAGING Four Channel Microphone Mixing on Portable Cart
RENTAL STAGING
Four Channel Microphone Mixing on Portable Cart
AN-2054
Description:
This system uses an RU‑MX4 four‑channel studio‑quality mic/line mixer for rental staging applications. A cart is used for moving the mixer, microphones, and other AV gear to the location where they are required. The mixer output feeds a high quality XLR wall plate that is directly wired into the house audio system. The mixer provides user‑adjustable input gain for level matching as well as an output trim and level meter for total adjustability in a compact package. The RU‑MX4 provides phantom power for condenser microphones and has a switchable soft‑knee compressor to avoid transient overloads.
KSU/PBX PAGING WITH BGM OVERRIDE Paging System for Office Space with BGM Override
KSU/PBX PAGING WITH BGM OVERRIDE
Paging System for Office Space with BGM Override
AN-2064
Description:
This example shows how to utilize a telephone line (input) port on an existing KSU to add paging from the telephone system to a background music (BGM) system. The ST‑TC1 acts as a virtual telephone line when connected to a KSU FX port. When that “line” is selected using any phone instrument connected to the KSU, the ST‑TC1 provides audio from the instrument mouthpiece to the ST‑VP2 Automatic Ducking Module. The ST‑VP2 automatically ducks the background music audio for the duration of the page, then ramps up the music at the end of the page. In this example an FP‑PA20A 70 volt amplifier is powering 70 volt loudspeakers in the office area. The ST‑TC1 provides relay contact closures when it is activated by a telephone instrument. The relay contacts can be used to provide additional functions when paging is active, including visual indicators or triggering a radio transmitter.
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