Radio Design Labs FP-UBC2
Unbalanced to Balanced Converter


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List Price: $237.84
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Radio Design Labs'  FP-UBC2 is the ideal choice for connectorized conversion from unbalanced to balanced audio. This module features two identical channels. Gold-plated phono jacks are utilized for each unbalanced input channel. Each output is balanced, connected through an XLR jack. A gain trim potentiometer is provided for each channel.

The normal gain setting is indicated for the trimming potentiometer. This setting produces a +4 dBu balanced output for a –10 dBV unbalanced input. The gain is adjustable –5 dB to +10 dB from the normal gain. Therefore, a +4 dBu output signal is possible from input signals ranging from –20 dBV to –5 dBV.

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 Unbalanced to Balanced 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-UBC2: 2 identical circuits (stereo or dual mono operation)
  • Gain: -5 dB to +10 dB (adjustable relative to +4 dBu output for –10 dBV input); (separate controls for each channel)
  • Input Level: -20 dBV to -5 dBV (for +4 dBu output)
  • Input Impedance: 10 kO
  • Input Configuration: Unbalanced Output Impedance: 150 O balanced, drives 600 O or 10 kO lines
  • Output Configuration: Balanced or unbalanced
  • Frequency Response: 20 Hz to 40 kHz (+/- 0.25 dB)
  • THD+N: < 0.05%; typ. 0.01% (1 kHz)
  • IMD: < 0.02%
  • Output Level: +4 dBu
  • Headroom: > 18 dB (at rated output level of +4 dBu)
  • Noise: < -85 dB referred to +4 dBu (20 Hz to 20 kHz)
  • Crosstalk: Better than 70 dB (20 Hz to 20 kHz);<-80 dB (typ. 1 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)
24 VDC 500mA Switching Power SupplyRadio Design Labs PS-24AS 24 VDC 500mA Switching Power Supply

Radio Design Labs' PS-24AS is a 24 Vdc switching power supply with a North American AC plug.  500 mA, dc plug.Specifications: Input: 100 to 240 VACOutput: 24 Vdc, 500 mA (UL, CSA)Dimensions: 1.65" x 2.75" x 1.45" (4.2 x 7 x 3.7 ...

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Pole Mount Tray for RDL Module Radio Design Labs PM-1T Pole Mount Tray for RDL Module

The PM-1T is a tray that mounts above a projector using a standard (1.5" I.D.) round projector pole or any smaller round or rectangular pole. The tray accommodates up to two FP-PA20 Audio Power Amplifiers (for stereo operation) and two ...

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Our Price:$80.35List Price: $107.48You save 25%!

Din Rail Mounting BracketRadio Design Labs DRA-35F Din Rail Mounting Bracket

The DRA-35F is a DIN rail mounting bracket that provides positive mounting for any RDL FLAT-PAK™ module. DIN rail mounting is ideal in locations subject to vibration, in confined spaces or where traditional rack mounting is not desired. ...

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Our Price:$10.34List Price: $12.21You save 15%!

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