Room Control Station for SourceFlex Distributed Audio System

The RDL D-SFRC8 is a single-room listening station for the SourceFlex distributed audio system. It brings source selection, level adjustment, line-level output, and local speaker amplification to an in-wall control point. A momentary SELECT button provides access to as many as eight audio sources, while a front-panel single-turn audio-taper control adjusts the listening level. Its red seven-segment display shows 1 through 8 for the selected channel, with 0 indicating off or Paging.

Ideal Use Cases

The D-SFRC8 is designed for office distributed sound systems carrying music and paging. It gives an individual room a dedicated listening station connected to a SourceFlex controller, allowing local source and volume control from the wall. This arrangement is suited to installations that need a compact control interface together with line-level and amplified audio outputs. The channel display keeps the selected source visible, while the 0 state clearly identifies either an off condition or Paging.

Why Choose This Model

This model consolidates several room-audio functions into one in-wall device. Users can select from up to eight sources with the channel SELECT pushbutton and adjust the level with a single-turn control. Two nominal line outputs support +4 dBu balanced or -10 dBV unbalanced operation. Line-output operation is switchable between fixed and variable, and the variable output follows the front-panel level control. The integrated amplifier also supplies a direct speaker output, eliminating the need to treat the station solely as a remote selector or line-level control.

The amplifier delivers up to 3.5 W RMS into 8 ohms or 6.5 W RMS into 4 ohms. High-efficiency Class D operation is paired with thermal and short-circuit protection. These features make the D-SFRC8 a focused SourceFlex room station for installations requiring both control and local audio output.

Installation and Integration

The D-SFRC8 mounts in a wall using a US single-gang electrical box or an RDL WB-1U. It is also compatible with other RDL wall plates and controls. The unit measures 4.13 inches high, 1.7 inches wide, and 2.05 inches deep, equivalent to 10.49 by 4.32 by 5.21 cm.

A 10-position detachable terminal block provides the input connection. The speaker output uses its own detachable terminal block, supporting installation and service without permanently attached wiring. Communication between the remote listening station and the SourceFlex controller uses dc control signals over the DISPLAY RAMP and CONTROL conductors.

Power is supplied by the SourceFlex controller at 24 Vdc. Current requirements are 30 mA while idle, 55 mA at one-eighth power during normal voice or music operation, and 225 mA when delivering 3.5 W into 8 ohms. The specified ambient operating range is 0 degrees C to 40 degrees C maximum, with 20 degrees C recommended.

Performance Highlights

At line level, frequency response is 20 Hz to 20 kHz within plus or minus 0.1 dB. Through the speaker output, response is 40 Hz to 20 kHz within plus or minus 1 dB. Line-level THD+N is below 0.1% from 20 Hz to 20 kHz, while speaker-output THD+N is below 0.25% at 1 kHz.

Specified line-level noise is below -85 dB relative to +4 dBu. Speaker-output noise is below -80 dB relative to 1 W RMS. Together with the fixed-or-variable line-output selection, these specifications let the station support line-level distribution as well as direct connection to a 4-ohm or 8-ohm speaker load.

What Makes It Different

The D-SFRC8 is more than a wall-mounted volume control. It combines eight-source selection, a numeric channel display, line-level connectivity, and Class D speaker amplification in a single-room station. Its variable line output tracks the same front-panel level control used for local adjustment, while fixed-output operation is also available. Balanced +4 dBu and unbalanced -10 dBV nominal line-output options support two common audio signal levels.

The detachable input and speaker terminal blocks, single-gang mounting format, and compatibility with other RDL wall plates and controls further distinguish it as an integrated part of a SourceFlex installation. Protection against thermal overload and output short circuits is built into the amplifier section.

Final Assessment

For a SourceFlex system serving office music and paging applications, the RDL D-SFRC8 provides a clearly defined room-control endpoint. It offers selection from up to eight sources, visible channel status, front-panel level control, two configurable line outputs, and up to 6.5 W RMS of local speaker power. Its in-wall format and controller-supplied power keep the station closely integrated with the distributed audio system.