Unbalanced to Balanced Amplifier - 2 channel

  • Convert Stereo IHF Levels to Stereo PRO
  • Additional Summed MONO OUT
  • Independently Adjustable Gain
  • Ground-Referenced Conversion Module
  • Dual-LED VU Metering for Each Channel Included
  • Unparalleled Audio Performance
Recommended Power Supply ( Not Included )
PS-24AS (USA)PS-24AX (International)


The ST-UBA2 is used in any application requiring conversion from unbalanced consumer format signals to professional +4 dBu. It may be used to balance audio from CD players, cassette decks, computer sound cards, televisions, and a wide variety of other unbalanced sources. The mono sum output may be used to drive patch-bay jacks, monitors or subwoofer amplifiers.

Separate Dual-LED VU metering is provided for the left and right outputs. A green LED illuminates at 15 dB below +4 dBu. The intensity of the green LED progresses from minimum at -11 dBu to full intensity at +4 dBu. The adjacent red LED illuminates at +4 dBu.

The audio clarity, low-noise, low-distortion and excellent crosstalk performance makes this module ideally suited to a wide variety of demanding audio applications. Use this module in conjunction with other RDL® modules as part of a high quality, flexible audio/video system.


Package Type:Cardboard Box
Power Requirement:GROUND-REFERENCED, 24 Vdc @ 75 mA
Ambient Operating Environment:0° C to 55° C
Headroom:> 18 dB above +4 dBu
Crosstalk< -75 dB @ 1 kHz
< -60 dB @ 10 kHz
IMD:< 0.004%
Indicators(4):1 green LED per channel indicating 15 dB range below +4 dBu output level output level
Noise:< -85 dB (referred to +4 dBu)
Frequency Response:20 Hz to 20 kHz (± 0.2 dB)
THD+N:< 0.02% (20 Hz to 20 kHz)
Package Dimensions:2 x 2 x 4 in.
Gain:2 dB to 22 dB (adjustable)
Shipping Weight:0.205 lbs.
Outputs (3):+4 dBu balanced (left, right, mono sum)
WEEE weight:0.155 lbs.
Tariff code:8543.70.9860
Input Impedance:10 kΩ
Output Impedance:150 Ω
Inputs (2):Unbalanced line-level
Input Signal Range:-20 dBV to -10 dBV

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CAD FilesUnitsFormat
Engineering Functional BlockAmericanDXF
Panel Diagram - EndAmericanDXF
Panel Diagram - FrontAmericanDXF
Panel Diagram - EndMetricDXF
Panel Diagram - FrontMetricDXF
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