M-633D
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Digital Stereo Mixer
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Easy to use compact digital mixing system with feedback suppressors and auto-resonance control in the 19th century "enclosure with a Unit." 
6 balanced mic / line inputs for microphones or recording devices in mono via pluggable connectors and balanced TRS Jack, sensitivity individually selectable phantom power for microphones can be activated individually. 
Three stereo inputs via cinch Sockets (RCA Sockets) for recording devices, individually switchable to the mixing of the left and right channel to the Mono summation. 
All inputs switching and mixable can be protected on a stereo master and 2 mono sum, the edge by a cover against unauthorized access.
Optional auto-hide the three stereo inputs with signal on the mono inputs by voice activation (VOX). 
Two mono outputs and a stereo output via pluggable connectors with own volume plates as well as a stereo recording connection via cinch Sockets (RCA Sockets).
Integrated automatic feedback suppressors (FBS) to increase the possible output volume for all mono channels can be activated individually. By suppressing the feedback frequencies only to the necessary level hardly any influence on the sound quality.
Anti-resonance control for improving speech intelligibility by reducing the resonance excitation in the room separately for the Mono outputs and stereo out just a measurable.

Microphone input sensitivity.: -46 dBV
Line input sensitivity :-10 dBV
Stereo input sensitivity:-10 dBV
Recording output level:-10 dBV
Nominal output level: 0 dBV, dBV to + 12
Frequency response: 20-20,000 Hz
Total harmonic distortion: < 0.03%
Ad / DA Converter: 24-bit, 48 kHz
Dynamic range: > 90 dB (IHF-A)

Manufacturer: TOA
Model: M-633D