Alesis MultiMix 12 USB, Service Manual

Multimix 12 USB Key Features   

 
Three Models:

Multimix 12 USB (4 mic/line preamps, 4 stereo inputs) 
 

Clean and powerful preamps

 – up to 50dB of preamp 

gain for capturing quiet sources.  Globally switched 
phantom power. 
 

4 Stereo inputs

 – Great for line-level instruments. 

Internal digital effects processor with 100 preset 
effects and an easy-to-read display – 

includes a variety 

of reverbs, delays, choruses, flanges, a pitch transposer and 
multiple combinations of these. 
 

3-band EQ per channel 

– a potent tool for sonically 

shaping each channel to get that perfect mix. 
 

1 pre/post-fader aux send per channel (switchable) – 

gives you control over the level of the pre- or post-fader       
signal being routed to an external device. 
 

1 post-fader aux send/effects send per channel

 – a 

control for the signal being routed to another external 
device or to the onboard effects processor. 
 

Control room output level

 – provides control over the 

separate control room output 
 

2-track send and return

 – lets you mix your audio to tape 

or other media and to add a tape deck or CD player to the 
mix. 
 

Stereo USB input and output 

– routes the main output 

and the 2-track return through the USB port in crystal- 
clean, 16-bit, 44.1 kHz stereo digital audio.  Use the 

Multimix USB as a high-quality soundcard for recording 
and playback with Windows and Macintosh computers. 
 

Specifications 

For the more technical-minded, here are some detailed 
specifications for the MultiMix’s operating levels. 
 

Input Channels 

Mic In Sensitivity Range: -60dBu to –10dBu nominal, +5dBu 

Maximum 

Line In Sensitivity Range: -40dBu to -+10dBu nominal, 
                    +25dBu maximum 
Mic/Line Gain Range: +10 to +60dB 
 

Equalization 

High-Pass Filter:  75Hz, 18dB/octave 
High Shelving:  12kHz,   +/- 15dB 
Mid Bandpass/Band Reject: 2.5 kHz, +/- 15dB 
Low Shelving:  80Hz,     +/- 15dB 
 

Aux Sends 

Aux Send A & B Gain Range:- 

∞

  to +10dB 

Aux Returns 

Aux Return A Gain Range:- 

∞

  to +15dB 

Effects Level/ 
Aux Return B Gain Range:- 

∞

  to +15dB 

Channel Levels 
 

Channel Level Gain Range: - 

∞

  to +10dB   

Master Levels 

Main Mix, Ctrl Room Gain 
 
 

SERVICE  MANUAL

MODEL:MULTIMIX 12USB