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The STM‑DA3 is designed for use in quality commercial sound, broadcast and recording applications. The 1.2 kΩ balanced input accepts a wide variety of microphone input levels without loading professional low impedance microphones. A multi‑turn trimmer is user adjustable for either gain or loss in order to match the facility standard microphone levels. Three balanced outputs provide nearly total isolation between the output lines. Unlike mic‑splitting transformer systems, the STM‑DA3 also provides audio isolation. In fact, the audio isolation is so good that a +4 dBu signal fed into one output is still below the noise floor on the adjacent output. Loading of one output including a direct short, has no effect on the other outputs.

Input:	1.2 kΩ balanced
Outputs (3):	‑45 dBu, 150 Ω balanced
Gain Range:	17 dB (Adjustable, 25‑turn trimmer)
Control Fully CCW:	Gain = ‑5 dB
Control Fully CW:	Gain = 12 dB
Frequency Response:	30 Hz to 20 kHz (+/‑ 0.2 dB)
IMD:	< 0.1%
Noise:	< 80 dB (below ‑50 dBu output, ‑50 dBu input)
Headroom:	> 20 dB (‑50 dBu output, ‑45 dBu input)
CMRR:	> 60 dB (100 Hz to 5 kHz)
Output Isolation:	> 135 dB (balanced audio) > 150 dB (common mode)
Power Requirement:	GROUND‑REFERENCED, 24 to 33 Vdc @ 40 mA