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Interface Amplifier, Unbalanced to Balanced


The Radio Design Labs STU-BA2 two-channel interface amplifier 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.

PS24AS power supply not included.

Main Features:
• 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

• Inputs (2): Unbalanced line-level
• Input Impedance: 10 kΩ
• Input Signal Range:-20 dBV to -10 dBV
• Outputs (3): +4 dBu balanced (left, right, mono sum)
• Gain: 2 dB to 22 dB (adjustable)
• THD+N: < 0.02% (20 Hz to 20 kHz)
• Frequency Response: 20 Hz to 20 kHz (+/- 0.2 dB)
• Noise: < -85 dB (referred to +4 dBu)
• Indicators(4): 1 green LED per channel indicating 15 dB range below +4 dBu output level output level 
•  IMD: < 0.004%
• Crosstalk: < -75 dB @ 1 kHz < -60 dB @ 10 kHz • Headroom: > 18 dB above +4 dBu
• Power Requirement: GROUND-REFERENCED, 24 Vdc @ 75 mA
• Ambient Operating Environment:0° C to 55° C

RDL ST-UBA2 Figure 1


RDL ST-UBA2 Figure 2 

List Price: $238.30
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