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U.S.D.A. (Utility Summing & Distribution Amplifier) is a unique 2×4 mini-DA that can be used to combine or split audio signals for distribution. It can be used as a 1×4 or 2×4 DA in stereo or mono.

There are 2 inputs (1 stereo pair) and 4 outputs (2 stereo pairs). Front panel “Stereo/Mono” switches select either a stereo or mono output from each output pair. USDA can produce both stereo and mono outputs simultaneously from a stereo source. Inputs and outputs can be operated either balanced or unbalanced. The audio level of each output can be adjusted over a 26db range. All circuitry is transformerless and direct-coupled for sonic accuracy.

Connections are via plug-in euroblock connectors. USDA 2X4 is 1/3 rack width and can be mounted in an optional rack shelf, or wall mounted with optional wall/cabinet mounting brackets. USDA 2X4 is powered by an internal AC power supply.


Input Level -14 to +8 dBm nominal
Input Impedance 20K ohms bal, 10K ohms unbal
Output Level 0 to +8 dBm nominal, +26 dBm max
Output Load 600 ohms or higher per output, bal
Controls Output Level for each channel
Gain -12 to +14 dB
Frequency Response DC to 20kHz, ±0.25 dB
Distortion <.01% IM/THD
Noise >80 dB below nominal output, typ
Power Requirements 115/230VAC, 50/60Hz, 3 W
Construction Steel enclosure
Physical 1.45cm (W) x 4.3cm (H) x 15.2cm (D); 1361 grams
Mounting Table top, optional rack mount shelf, optional wall/cabinet mounting brackets