Active Three-Pair Receiver-Twisted Pair Format-A-XLR and stereo phono outputs

Ideal Use Cases

The RDL D-TPR3A is designed for audio systems that need to receive all three signal pairs from an RDL Format-A feed. Pair A is delivered through a balanced XLR output, while pairs B and C are routed to left and right unbalanced RCA phono outputs. This configuration supports installations requiring one selectable balanced microphone- or line-level signal alongside a stereo -10 dBV output. Remote powering through the twisted-pair cable and a local 24 Vdc power option provide flexibility when planning system power distribution.

Why Choose This Model

The D-TPR3A combines three Format-A receiver paths in a compact module. Its XLR output can be switched on the rear panel between -45 dBu microphone level and +4 dBu line level, allowing the balanced output to match different downstream equipment. Two RCA phono jacks provide fixed -10 dBV unbalanced outputs for the left and right channels. Studio-quality precision active balanced circuitry supports dependable signal handling, while a blue LED provides an immediate indication that the module is powered.

The module also offers practical power-management capabilities. It can receive power remotely through its twisted-pair connection or accept local power through a detachable terminal block. When locally powered, its fused power feed supplies connected modules. The specified requirement is 24 Vdc at 45 mA plus the requirements of any connected loads.

Installation and Integration

The input is RDL Format-A, with the D-TPR3A using an RJ45 connection. All three Format-A signal pairs—A, B, and C—are utilized. Pair A feeds the balanced XLR connector, and pairs B and C feed the left and right RCA phono jacks respectively. This defined routing makes it straightforward to identify each received signal during installation and system commissioning.

Power connections are available through both the RJ45 interface and a detachable terminal block. Recommended power supplies, which are not included, are the PS-24AS for the USA and PS-24AX for international use. The module measures 1.6 inches wide, 4.11 inches high, and 1.89 inches deep. D- and DS-series installations require a mounting box with a minimum depth of 2.4 inches. The specified ambient operating range is 0 degrees C to 55 degrees C.

Performance Highlights

The D-TPR3A provides a frequency response of 10 Hz to 50 kHz within ±0.1 dB. Total harmonic distortion plus noise is specified at less than 0.005%, and noise below a +4 dBu output is less than -90 dB. Headroom above +4 dBu exceeds 18 dB, supporting the selectable line-level output with additional operating margin.

Common-mode rejection exceeds 80 dB from 50 Hz to 150 Hz. Crosstalk is specified at less than 90 dB at 1 kHz and less than 75 dB across 20 Hz to 20 kHz. The balanced output impedance is 150 ohms, while the unbalanced output impedance is 100 ohms. Together, these specifications document the module’s active audio performance across its balanced and unbalanced outputs.

What Makes It Different

This model receives and assigns every available Format-A pair to a dedicated output: a balanced XLR from pair A and stereo RCA phono outputs from pairs B and C. The rear-panel level selection gives the XLR path a choice of microphone or professional line level without changing the two fixed -10 dBV outputs. Remote or local powering, a fused feed for connected modules, and visible power indication bring signal reception and power distribution into the same compact module.

Final Assessment

The RDL D-TPR3A is a focused three-pair Format-A receiver for installations requiring balanced XLR and stereo unbalanced RCA connectivity. Its selectable -45 dBu or +4 dBu XLR level, 10 Hz to 50 kHz response, low THD+N specification, dual powering methods, and clearly assigned signal pairs provide a well-defined integration path. It is particularly appropriate when all three Format-A pairs must be recovered through separate balanced and stereo outputs.