Stereo Balancing Amplifier – SBA-379, SBA-379-M

The SBA-379 Stereo Balancing Amplifier, which comes in 2 versions, is an economical way to convert two unbalanced audio inputs to balanced outputs. The SBA-379 retains stereo separation with individual L/R gain, while the SBA-379-M model sums the stereo pair to mono and provides two balanced outputs with individual gain controls. Originally designed for the cable TV industry, the mono version eliminates the distortion, unpredictable frequency response and potential equipment damage that can result when a Y-cable is used to sum two outputs. Conventional dual input connectors provide both RCA and screw terminals. The SBA-379 is built into a rugged diecast aluminium box. Power is provided via a 24 VDC CSA/UL approved adapter.

SBA-379 Stereo Balancing Amplifier


Input Connections:
RCA or screw terminal

Frequency response:
(@+4dB output into 600ohms)

20Hz – 20kHz +0, -1dB

15Hz – 50kHz +0.5, -3dB

Maximum Output:
+22dBm at 1kHz into 600ohm balanced load

Gain range:
Off to +32dB

Residual noise:
-70dBu gain full


4.5″L x 2.4″W x 1.25″D

Power supply:
24 VDC CSA/UL approved adapter (included) or ±12 VDC to ±17 VDC bipolar supply.

Sum stereo input to mono (model SBA – 379 – M)

Click here for wiring diagram