Three Input Format-A Source Selector-SS

The RDL DS-TPRX3A is a three-input source selector designed for remote selection among sources carried on three RDL Format-A signal pairs. Three front-panel momentary pushbuttons provide direct, single-button source selection, while corresponding indicators identify the selected channel. The unit delivers a nominal +4 dBu line-level balanced output through a detachable terminal block and provides an RJ45 Format-A loop-through connection.

Ideal Use Cases

This model is suited to installed audio systems that require a straightforward way to select among three sources corresponding to Format-A pairs A, B and C. Its compact dimensions and 2.4-inch minimum mounting-box depth support integration where wall-mounted source control is required. The combination of front-panel selection, visible channel indication and a balanced line-level output makes it appropriate for systems built around RDL Format-A signal distribution.

The display remains bright during adjustment and dims afterward, keeping the selected source visible without maintaining full display brightness continuously. Available stainless steel, black and white versions allow the selector to be matched to different installation finishes.

Why Choose This Model

The DS-TPRX3A combines source selection, active balanced audio circuitry and power distribution functions in one all-metal assembly. Each of the three inputs has its own momentary pushbutton, avoiding multi-step source navigation. Three front-panel indicators show the selected channel, giving the operator immediate confirmation of the active source.

Remote powering is supported through twisted-pair cable. The unit also has a local 24 Vdc power input on a detachable terminal block, and its fused local power feed can supply connected modules. This flexibility allows power to be introduced through the RJ45 connection or through the local terminal-block connection according to the system design.

Installation and Integration

The input is RDL Format-A on an RJ45 connector, with signal pairs A, B and C used for the three selectable sources. A second RJ45 connection provides Format-A loop-through capability. The selected audio is presented as a 150 Ω balanced output on a detachable terminal block at a nominal +4 dBu line level.

Two power connection methods are provided: a detachable terminal block and RJ45. The power requirement is 24 Vdc at 45 mA plus connected loads. Recommended supplies are the RDL PS-24AS for the USA and PS-24AX for international applications. The unit measures 1.6 inches wide by 4.11 inches high by 1.89 inches deep and requires a mounting box with a minimum depth of 2.4 inches.

Performance Highlights

The precision active balanced circuitry provides a frequency response of 10 Hz to 20 kHz within ±0.5 dB. THD+N is less than 0.005% at 1 kHz, while noise below +4 dBu is specified at less than -85 dB. Headroom above the nominal +4 dBu output exceeds 18 dB.

Common-mode rejection is greater than 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 from 20 Hz to 20 kHz. The specified ambient operating range is 0° C to 55° C.

What Makes It Different

The DS-TPRX3A is specifically organized around three Format-A pairs rather than conventional standalone analog input connectors. Its one-button-per-source interface keeps operation direct, while the RJ45 loop-through preserves the Format-A connection for downstream integration. Remote twisted-pair powering, a fused local power feed for connected modules and a separate local power input provide several ways to accommodate the power architecture of an installed system.

All-metal construction supports permanent installation, and the detachable terminal blocks simplify output and local power wiring. The compact faceplate dimensions allow these selection and distribution functions to be installed in a narrow physical footprint.

Final Assessment

The RDL DS-TPRX3A provides focused control for three-source Format-A systems. It pairs direct front-panel selection with clear channel indication, a balanced +4 dBu output, loop-through connectivity and flexible power connections. Its specified audio performance, compact dimensions and all-metal construction make it a purpose-built choice when three Format-A source pairs must be selected from a remote wall-mounted control point.