Active Single-Pair Receiver-Twisted Pair Format-A-XLR mic/line output

Ideal Use Cases

The RDL D-TPR1A is an active single-pair receiver for RDL Format-A twisted-pair audio systems. It fits installations that need to take one Format-A audio pair and deliver it as a balanced mic- or line-level signal through an XLR connection. A rear-panel selector chooses pair A, B, or C, allowing the required signal to be routed from a shared Format-A feed. The separate output-level switch selects mic or +4 dBu line level. RJ45 signal and power pass-through also supports layouts in which additional Format-A receivers are connected in a daisy chain.

Why Choose This Model

The D-TPR1A combines pair selection, level selection, active balanced conversion, pass-through, and powering options in one compact module. Its XLR output is 150 ohms balanced, while the selectable source pair avoids tying the receiver permanently to only one of the three Format-A audio pairs. Power may arrive remotely through the twisted-pair cable or locally through a detachable terminal block. When local power is used, a fused feed supplies connected modules. A blue LED provides a visible powered-state indication, helping confirm that power is present during setup or service.

Installation and Integration

For the D- model, the Format-A input uses RJ45, and the Format-A output uses RJ45 for onward connection. Select A, B, or C for the signal pair, choose mic or line output on the rear panel, and connect the destination through the XLR output. The module requires 24 Vdc at 45 mA plus the requirements of connected loads. Recommended supplies, which are not included, are the PS-24AS for the USA and PS-24AX for international use. Two power connection methods are identified: the detachable terminal block and RJ45. The minimum mounting-box depth for D- and DS- models is 2.4 inches. The module measures 1.6 inches wide, 4.11 inches high, and 1.89 inches deep. Its specified ambient operating range is 0 degrees C to 50 degrees C.

Performance Highlights

Studio-quality precision active balanced circuitry is complemented by detailed audio performance specifications. Frequency response is 10 Hz to 50 kHz within plus or minus 0.1 dB. THD+N is below 0.005 percent, and noise measured below +4 dBu is less than -90 dB. Headroom above +4 dBu exceeds 18 dB. Common-mode rejection is greater than 80 dB from 50 Hz to 150 Hz. These figures define the receiver’s specified bandwidth, distortion, noise, headroom, and rejection performance without relying on unspecified processing features.

What Makes It Different

The defining feature is its combination of one-pair reception and three-pair selection. The module extracts whichever of the A, B, or C signal pairs is selected while allowing signal and power pairs to continue through the RJ45 connections. That pass-through architecture permits another Format-A receiver to be added downstream rather than ending the twisted-pair path at this output. Local powering can also feed all connected modules through a fused connection, while remote powering keeps power delivery on the twisted-pair cable. The D-TPR1A is available in white, black, and stainless steel, providing finish choices for different installations.

Final Assessment

The D-TPR1A is specifically configured for converting a selected RDL Format-A pair to a balanced XLR mic- or line-level output. It brings together rear-panel A/B/C pair selection, switch-selectable output level, RJ45 pass-through, local or remote 24 Vdc powering, and active balanced circuitry. Its specifications include a 10 Hz to 50 kHz response, less than 0.005 percent THD+N, and more than 18 dB of headroom above +4 dBu. For systems built around Format-A transport and XLR-connected destinations, it provides the documented routing, powering, and daisy-chain functions in a 1.6-by-4.11-by-1.89-inch module.