Three Input Format-A Source Selector-Black

Ideal Use Cases

The black RDL DB-TPRX3A is designed for audio installations that require remote selection among three sources carried on three RDL Format-A signal pairs. It uses pairs A, B, and C and routes the selected source to a balanced, line-level output. This makes it suited to systems where an operator needs straightforward front-panel source control while the Format-A connection, output wiring, and power infrastructure remain integrated behind the panel. Its RJ45 loop-through also allows the Format-A connection to continue to another module.

Why Choose This Model

Each input has its own momentary pushbutton, so source selection does not require navigating menus or using a shared control. Three front-panel indicators identify the selected channel. The display remains bright during adjustment and dims afterward, preserving clear visual feedback when a change is made. Internally, the selector uses studio-quality precision active balanced circuitry. Its all-metal construction provides a durable physical platform, while the black finish matches the specified DB-TPRX3A configuration.

Installation and Integration

The DB-TPRX3A accepts an RDL Format-A input through an RJ45 connection and uses all three available signal pairs: A, B, and C. A second RJ45 connection provides Format-A loop-through. The selected audio is delivered through a detachable terminal block as a 150 Ω balanced output at a nominal +4 dBu line level.

Power can arrive remotely through the twisted-pair RJ45 cable or locally through the detachable terminal block. When local power is used, a fused feed supplies connected modules. The specified requirement is 24 Vdc at 45 mA plus the requirements of connected loads. RDL lists the PS-24AS as the recommended USA power supply and the PS-24AX for international use.

The unit measures 1.6 inches wide, 4.11 inches high, and 1.89 inches deep. Installation requires a mounting box with a minimum depth of 2.4 inches. These dimensions and the dual power-connection options should be considered when planning the mounting location, terminal-block wiring, RJ45 cable routing, and any downstream modules drawing power from the local feed.

Performance Highlights

The active balanced audio path provides a frequency response of 10 Hz to 20 kHz within ±0.5 dB. THD+N is specified at less than 0.005% at 1 kHz, while noise below a +4 dBu output is specified at less than -85 dB. Available headroom is greater than 18 dB above +4 dBu. Common-mode rejection exceeds 80 dB from 50 Hz to 150 Hz.

Off attenuation is specified at less than 90 dB at 1 kHz and less than 70 dB across 20 Hz to 20 kHz. Together with the nominal +4 dBu output and 150 Ω balanced interface, these published figures define how the selector integrates into a line-level balanced audio path. The supported ambient operating range is 0° C to 55° C.

What Makes It Different

The DB-TPRX3A combines three-source selection, visible channel status, balanced line-level conversion, Format-A loop-through, and flexible powering in one compact module. The dedicated button-and-indicator arrangement gives every source an immediately identifiable control. Remote powering reduces the need for power at the control location, while the local input and fused feed provide another integration path when connected modules also require power. Detachable terminal blocks simplify access to the balanced output and local power connections.

Final Assessment

For a system built around three RDL Format-A audio pairs, the DB-TPRX3A provides a focused method of selecting pairs A, B, or C and presenting the chosen source as a nominal +4 dBu balanced output. Its dedicated controls, LED indication, dimming display, RJ45 loop-through, two power-connection methods, and documented audio performance make its capabilities clear before installation. The result is a compact black source selector centered on direct operation and defined Format-A integration.