Radio Design Labs RU-ASX4DR
4 In x 1 Out Remote Controlled Stereo Audio Selector with VCA


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The Radio Design Labs RU-ASX4DR is a four channel stereo audio selector with input gain adjustments and output level metering. The module is equipped with an internal stereo VCA for setting the output level. Source selection and level adjustment are by remote control. Each module may be remote controlled from a single or multiple locations. Rear-panel terminals provide flexible control options using a variety of RDL remote controls or OEM equipment. The inputs and output are connected on rear-panel detachable terminal blocks.

Each of the four stereo line level inputs accepts either a balanced or an unbalanced signal. Each input is equipped with a rear panel screwdriver-adjustable input gain trimmer. Input signal levels between -15 dBV and +8 dBu may be set to the proper operating level as indicated by a stereo dual-LED VU meter. This assures ample headroom at all normal operating levels. The module is equipped with two identical dual-led VU meters, one on the front panel, the other on the rear panel. The maximum input level is +25 dBu.

The RU-ASX4DR was designed for absolute silent switching of audio signals using only solid-state switching circuitry. Each of the VU-meters, left and right, is calibrated to read +4 dBu feeding the corresponding balanced output.

The audio output level is controlled by a remote 10 kOhms linear taper pot or by 0 to 10 Vdc. A single remote control location is possible using a remote 10 kOhm potentiometer. The RU-ASX4DR is compatible with RDL D SERIES-RLC10 rotary remote controls that provide user adjustment at single or multiple locations. Audio levels are controlled in 0.5 dB steps using noiseless zero-crossing digital attenuators for optimum reliability, precise tracking and long-term click-free service. The output is stereo line level. Each output channel may be connected balanced or unbalanced.

Inputs are selected by a sequential remote control such as an RDL D-RCS4, by a momentary remote control such as an RDL D-RC4M or by an external open-collector momentary closure to ground. The RU-ASX4DR may be remote controlled from a single or from multiple locations. When a source is selected, the RU-ASX4DR provides a 25 mA open-collector output to control other equipment or modules. A front-panel LED indicates the selected source. Only one source may be selected at a time. If the momentary input terminal for a selected source is triggered again, all inputs are turned off.

Rear-panel DIP switches are provided to set the VCA activity LEDs for momentary or continuous display, to select the remote control mode (sequential or individual source selection), and upon power-up a return to either a pre-programmed source or to the last source used. The pre-programmed source is stored when the module is installed.

The RU-ASX4DR offers exceptional headroom, very low distortion, excellent crosstalk isolation, wide flat frequency response and extremely low noise with very high common-mode signal rejection. It provides exceptional audio performance for the most critical applications in a professional audio environment.

The RU-ASX4DR operates from 24 Vdc connected through a rear-panel detachable terminal block.

NOTE: Radio Design Labs' PS-24AS power supply is NOT included but is required in order to power this product. Please click here for more information on the PS-24AS power supply.

Radio Design Labs RU-ASX4DR Features:

  • Remote Controlled Switching and Level Control
  • Multiple Remote Control Locations Possible
  • 4 Stereo Inputs to 1 Stereo Output
  • Line-Level Audio Switching
  • External Level Control Using 10 kOhms Potentiometer or 0 to 10 Vdc
  • 96 dB Attenuation Range in 0.5 dB Steps
  • Noiseless Zero-Crossing Adjustment Steps
  • Precise Level Tracking on Each Channel
  • Balanced or Unbalanced Inputs and Output
  • Gain Trim on Each Source
  • Controllable Using Various RDL Remote Controls
  • Open-Collector Output for Selected Input

Radio Design Labs RU-ASX4DR Specifications:

  • Audio Inputs (4):  Stereo, Line level on Detachable Terminal Block
  • Input Impedance:  > 20 kOhms balanced, > 10 kOhms unbalanced
  • Input Level (for +4 dBu output):  -15 dBV to +8 dBu, adjustable on rear-panel trimmers
  • Maximum Input Level:  +25 dBu
  • Common Mode Rejection:  > 60 dB (50 Hz to 120 Hz)
  • Headroom (above +4 dBu):  > 18 dB (unity gain)
  • Frequency Response:  10 Hz to 20 kHz (+/-0.2 dB)
  • Distortion (THD + N):  < 0.01% (20 Hz to 20 kHz)
  • Noise (below +4 dBu):  < -85 dB (with any input selected); < -95 dB (with no input selected)
  • Off Attenuation:  > 85 dB (1 kHz), > 70 dB (20 kHz)
  • Crosstalk:  < -80 dB (1 kHz); < -60 dB (20 kHz)
  • Front-Panel Indicators (11):  Power, Selected channel (4), VCA activity up/down (2), L and R Dual-LED VU meters (4)
  • Audio Output:  Stereo, Line level on Detachable Terminal Block
  • Output Impedance:  150 Ohms balanced, 75 Ohms unbalanced
  • Output Level:  +4 dBu balanced, unbalanced output 6 dB below balanced output level
  • Control inputs (6):  1 mA, pulled to ground (4, source selection); 1 mA, pulled to +15 Vdc (SEL); 0 to 10 Vdc (VCA)
  • Control outputs (5):  25 mA, open-collector to ground
  • VCA Control Input:  0 to 10 Vdc; or 0 to 10 kOhms linear potentiometer
  • Rear-Panel Indicators (4):  L and R Dual-LED VU meters
  • RDL Remote Control Compatibility:  D-RC4M, D-RCS4 (source selection); D-RLC10, D-RLC10M, D-RLC10K, D-RLC10KM, D-RLC3 (VCA)
  • Power Connection:  Detachable Terminal Block
  • Power Requirement:  24 Vdc @ 175 mA, Ground-referenced
  • Ambient Operating Environment:  0┬░ C to 55┬░ C
Remote Channel Selector - 4 ChannelsRadio Design Labs D-RCS4C Remote Channel Selector - 4 Channels

The RDL D-RCS4C is a remote channel selector for 4 channels. The D-RCS4C controls the RU-ASX4D/R.

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