Radio Design Labs D-TPR3A
Active Three-Pair Receiver


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The Radio Design Labs D SERIES-TPR3A modules are three-pair audio receiving modules compatible with RDL® Format-A twisted pair products. These modules are designed to be mounted in wall boxes, cabinets or other enclosures that allow users to connect external equipment. The -TPR3A models mount in RDL WB-1U and WB-2U wall boxes, or in standard U.S. electrical boxes. The D-TPR3A features a white front-panel laminate with gray lettering that matches RDL Decora©-style remote controls. The DB-TPR3A features a black front-panel laminate. The DS-TPR3A is constructed of stainless steel to coordinate with RDL Decora-style stainless steel remote controls in commercial/industrial installations.

The D SERIES-TPR3A modules feature an XLR audio output and two RCA phono jack outputs, one for the left channel and one for the right channel. The audio signal received from pair A of the RJ45 INPUT jack feeds the XLR audio output jack. The output level from the XLR jack is set to either MIC or LINE level during installation using a rear-panel switch. The audio signals received from pairs B and C of the twisted pair cable are buffered to drive the RCA output jacks at the standard -10 dBV consumer level.


Although the D SERIES-TPR3A modules access signals from all three cable pairs, additional receivers may be connected to the same twisted pair feed. The bridging input circuits used in all FORMAT-A twisted pair receivers allow connection of up to 10 receiver outputs for each cable pair. The possibility of multiple receiver locations adds enormous flexibility in the design of audio routing systems using RDL FORMAT-A products.

The D SERIES-TPR3A may be powered directly from a 24 Vdc power supply using the rear-panel detachable terminal block. Local power connected to the module is also fed to all connected remote modules. The -TPR3A may be remotely powered through the twisted pair cable from any other module, signal distributor or RDL power inserter connected to the same twisted pair cable. Module power is indicated by a front-panel LED.

RDL FORMAT-A features superior audio performance that rivals or exceeds shielded wiring. Simplicity, ease of installation, unsurpassed flexibility, automatic fused power, exceptional hum rejection, low noise, and low distortion provide installers the optimum choice in twisted pair products.

Recommended Power Supply:
PS-24AX (International)

Radio Design Labs D-TPR3A Features:

  • Balanced Mic or Line Level XLR Output
  • Switch-Selectable Output Level on Rear Panel
  • Two Unbalanced -10 dBV Phono Jack Audio Outputs
  • XLR From Pair A; L From Pair B; R From Pair C
  • Remote Powering through Twisted Pair Cable
  • Fused Local Power Feeds all Connected Modules
  • Local Power Input on Terminal Block
  • Blue LED Indicates Module is Powered
  • Utilizes All Three Format-A Pairs
  • Studio-Quality Precision Active Balanced Circuitry

Radio Design Labs D-TPR3A Specifications:

  • Input: RDL FORMAT-A
  • Input Connection: RJ45 (Models D-, DS-); Detachable Terminal Block (Model EM-)
  • Format-A Signal Pairs Used (3): A, B, C
  • Outputs (3): 150 O balanced; 100 Ohm unbalanced
  • Output Connection: XLR (balanced Mic or Line); RCA Phono Jack (2)
  • Output Level:
    • XLR: -45 dBu Mic or +4 dBu Line Level, Switch-selectable on rear panel;
    • RCA phono: -10 dBV
  • Frequency Response: 10 Hz to 50 kHz (± 0.1 dB)
  • THD+N: < 0.005%
  • Noise below +4 dBu: < -90 dB
  • Crosstalk: < 90 dB (1 kHz); < 75 dB (20 Hz to 20 kHz)
  • Headroom above +4 dBu: > 18 dB
  • CMRR: > 80 dB (50 Hz to 150 Hz)
  • Indicator: Power In
  • Power Connections (2): Detachable terminal block; RJ45
  • Ambient Operating Environment: 0° C to 55° C
  • Power Requirement: 24 Vdc @ 45 mA plus connected loads
  • Dimensions: 1.6" (4.06 cm) W; 4.11" (10.45 cm) H; 1.89" (4.8 cm) D
  • Mounting Box Minimum Depth: 2.4" (Models D-, DS-); 39 mm (Model EM-)
  • Package Type: Cardboard Box
  • Package Dimensions: 3.625 x 4.625 x 2.125 in.
  • Shipping Weight: 0.39 lbs.
  • WEEE weight: 0.245 lbs.
  • Tariff code: 8517.18.0000
24 VDC 500mA Switching Power SupplyRadio Design Labs PS-24AS 24 VDC 500mA Switching Power Supply

Radio Design Labs' PS-24AS is a 24 Vdc switching power supply with a North American AC plug.  500 mA, dc plug.Specifications: Input: 100 to 240 VACOutput: 24 Vdc, 500 mA (UL, CSA)Dimensions: 1.65" x 2.75" x 1.45" (4.2 x 7 x 3.7 ...

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