Radio Design Labs FP-BUC2
Balanced to Unbalanced Converter


Radio Design Labs' FP-BUC2 is a great choice for connectorized conversion from balanced to unbalanced audio. This module features two identical active (transformerless) channels. Gold contact XLR jacks are utilized for the balanced input channels. Each output is unbalanced, connected through a gold-plated phono jack. A level trim potentiometer is provided for each channel.

The FP-BUC2 circuitry features low noise and distortion, excellent headroom and crosstalk performance and the superior audio clarity for which RDL products are known. The FP-BUC2’s low profile and compact size permit mounting in confined spaces and in various locations in equipment racks.

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


  • Stereo Balanced to Unbalanced Audio Conversion
  • Connectorized Audio Converter
  • Output Level Trim
  • Low-Noise and Low-Distortion Conversion
  • Cabinet, Shelf or Rack Mounting
  • Convenience of RDL® FLAT-PAKs™


  • Amps per FP-BUC2: 2 identical circuits (stereo or dual mono operation)
  • Gain: +/- 6 dB (adjustable relative to –10 dBV output for +4 dBu input); (separate controls for each channel)
  • Input Level: –2 dBu to +10 dBu (for -10 dBV output)
  • Input Impedance: 20 kOhm
  • Input Configuration: Balanced bridging
  • Output Level: -10 dBV
  • Output Impedance: 75 Ohm (drives 600 Ohm or 10 kOhm unbalanced lines)
  • Output Configuration: Unbalanced
  • Frequency Response: 10 Hz to 40 kHz (+/- 0.1 dB)
  • THD+N: < 0.005% (10 Hz to 40 kHz)
  • IMD: < 0.005%
  • Headroom: > 18 dB (at rated output level of -10 dBV)
  • Noise:
    < -90 dB (referred to -10 dBV, 20 Hz to 20 kHz)
    Typ. –95 dB (rel. –10 dBV, “A-Weighted”)
  • CMRR: > 50 dB (20 Hz to 5 kHz)
  • Crosstalk: Better than -90 dB (20 Hz to 20 kHz)
  • Power Requirement: GROUND-REFERENCED, 24 Vdc @ 50 mA
  • Dimensions: 1.29" H x 3.25" W x 4.07" L (3.28 x 8.26 x 10.34 cm)

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