Audio Selector for SourceFlex Distributed Audio System

The RDL D-SFRC8L is a single-room listening station for a SourceFlex distributed audio system. Installed in a wall, it gives users pushbutton selection from as many as eight audio sources and identifies the active channel on a red 7-segment LED display. Two nominal line outputs support +4 dBu balanced and -10 dBV unbalanced audio. The station is intended for office distributed sound systems that combine music and paging.

Ideal Use Cases

The D-SFRC8L is designed for offices and other single-room locations that need access to multiple sources within a distributed sound system. A user can select from up to eight audio sources at the wall using the momentary channel SELECT button. The numerical display provides immediate source identification: channels 1 through 8 indicate the selected source, while 0 represents either the off state or Paging. This operating format is particularly relevant to installations where background music and paging share the same SourceFlex system.

Why Choose This Model

This listening station combines in-wall source selection, a visible channel display, and line-level audio output in one compact control. Its two line outputs accommodate +4 dBu balanced and -10 dBV unbalanced nominal levels, providing both balanced and unbalanced output options. Power is supplied by the SourceFlex controller at 24 Vdc and 30 mA. The station also communicates with the controller through dc DISPLAY RAMP and CONTROL conductors, keeping its selection and display functions integrated with the SourceFlex system.

Installation and Integration

The D-SFRC8L mounts in a standard US single-gang electrical box or an RDL WB-1U. It is also compatible with other RDL wall plates and controls, allowing it to be incorporated into a coordinated wall-control installation. Connections are made through a 10-position detachable terminal block. The panel measures 4.13 inches high, 1.7 inches wide, and 2.05 inches deep, equivalent to 10.49 by 4.32 by 5.21 centimeters. Its specified ambient operating range is 0 degrees C to 50 degrees C maximum, with 20 degrees C recommended.

Performance Highlights

Published audio performance covers a frequency response of 20 Hz to 20 kHz within ±0.1 dB. THD+N is specified at less than 0.1% across the same 20 Hz to 20 kHz range. Noise is specified below -85 dB relative to +4 dBu. The two nominal line outputs are rated for +4 dBu balanced and -10 dBV unbalanced operation. Together, these specifications define the station’s audio bandwidth, distortion, noise, and output-level capabilities without requiring a separate source selector at the listening location.

What Makes It Different

The D-SFRC8L brings several SourceFlex room functions into a single-gang in-wall station. Rather than providing source selection alone, it pairs an eight-source momentary selector with a clear red numerical display and balanced or unbalanced line-level output. Its display logic also accounts for paging and the off state through the 0 indication. Compatibility with RDL wall plates and controls makes the unit suitable for installations that use multiple coordinated control panels within the same room.

Final Assessment

Choose the D-SFRC8L when a SourceFlex installation requires wall-mounted selection of up to eight audio sources together with a line-level output. It provides a direct momentary-button interface, visible channel confirmation, controller-supplied 24 Vdc power, and both +4 dBu balanced and -10 dBV unbalanced nominal output levels. Its single-gang mounting options and compact dimensions make it a focused solution for office music and paging systems that need source control at the listening location.