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SPDIF 4x1 Input Selector



  • Selection of SPDIF Signals (4 x 1)
  • Operation Up to 24 bits, 96 kHz
  • Exclusive Sure-Lok Auto-Recovery Sentinel
  • Transformer Isolated Input / Outputs
  • Digital Signal Reclocking
  • Signal Locked or Error Indication

APPLICATION: The RDL-RU-SPX4 is the ideal choice in installations requiring high quality source selection between digital SPDIF or AES-3ID signals. Solid-state switching is used to select one of four transformer-isolated electrical or optical SPDIF inputs. The selected input is decoded, reclocked and retransmitted to the transformer-isolated electrical SPDIF output and optical output. Each input channel in the RDL-RU-SPX4 features two electrical inputs (phono and BNC) and one optical input. The electrical inputs are 75 Ω terminated. Any one of the three input jacks may be used. The output is available on a phono jack, BNC jack or optical connector. The RDL-RU-SPX4 is powered from 24 Vdc which may be connected through the barrier block or through the dc power jack. A front-panel power switch is provided. All inputs and outputs are available on the rear panel. The RU-SPX4 front-panel selected channel LED flashes whenever the module is not locked to a valid SPDIF digital source. A front-panel LOCAL/REMOTE toggle switch activates either the front-panel buttons or a rear-panel connected remote control.

Sure-Lok auto-recovery circuitry included in the RU-SPX4 monitors the most frequent causes of latch-up and reinitiates digital signal lock, bringing a new higher level of stability to digital audio signal selection under the variety of conditions encountered in professional environments.

Part # Description Get Quote
RDL-RU-SPX4 RU-SPX4 - Digital Audio Selector  SPDIF - 4X1




Inputs (4):

75 Ω SPDIF phono, BNC (transformer isolated), or optical


75 Ω SPDIF phono, BNC (transformer isolated), or optical

Sample Rate:

32 kHz to 96 kHz


16 to 24 bits

Indicators (6):

4 Source LEDs (flashing when source selected and not locked; continuous when source selected and locked)


IEC958, S/PDIF and EIAJCP340/1201

Power Requirement:

GROUND-REFERENCED, 24 to 33 Vdc @ 140 mA


Data / Installation






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