Government and Military

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.

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 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 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.

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 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 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.

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.

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.

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.

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.

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.

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.)

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.

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.

Description:

The RDL SourceFlex 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 eavesdropping issues of wireless distributed audio systems. The hard-wired physically secure distribution limits use of the audio material to locations that are intentionally connected.

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.

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.

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.

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.

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.