Electro Voice Music Mixer MA 1212 User Manual

MA-1212 Mixer Amplifier  
120-Watt, 12 Input  
Mixer Amplifier  
General Description:  
The Electro-Voice ® MA-1212 is a 120-watt, twelve-input  
mixer amplifier designed for commercial sound  
applications. It features twelve separate input controls  
which can be used to adjust the level from any of 12 input  
sources. Figure 1 shows the layout of the front and rear  
panels.  
Input channels 1-10 are designed to either be used as  
low-Z balance microphone or line level inputs. The  
combination connector on inputs 1-10 permits use of either  
XLR or ¼” input connectors. The block diagram shown in  
Figure 2 outlines the signal flow for the MA-1206. A signal  
appearing at either input 1 will automatically mute the other  
channels unless the mute function is defeated via a switch  
on the rear panel.  
at the paging input, it shall automatically mute other input  
sources. The paging input shall be equipped with its own  
gain control. There shall be a master level control. Separate  
bass and treble equalization controls shall be provided. The  
mixer amplifier shall meet the following performance criteria:  
output power shall be 120 watts; total harmonic distortion  
shall be less than 1% at 1 kHz; frequency response shall be  
within 3 dB from 50 Hz to 15 kHz; input impedance shall be  
600-ohms (balanced inputs) or 47 kW (unbalanced inputs);  
nominal load impedance shall be 4-, 8- or 16-ohms for voice-  
coil-connected loudspeakers, 25, 70.7 or 100-volt nominal  
transformer windings for the constant-voltage output.  
Inputs 11 and 12 are for auxiliary line-level sources such  
as tape or CD players. Mono or stereo signals may be  
applied to inputs 11 or 12. The left and right components  
of a stereo signal can be applied to the dual RCA phono  
jacks of these inputs and mixed together to drive the built-  
in monaural power amplifier. A rear panel paging input  
with gain control is provided for the paging output of a  
telephone system. An audio signal appearing at this input  
automatically mutes all other inputs. A preamplifier output  
jack and power amplifier input jack permit the mixed output  
to be fed to an external signal processor (graphic EQ or  
compressor), and then returned to the built-in amplifier.  
The preamp output may be used to drive an additional  
power amp with its own set of speakers without interrupting  
the function of the built-in amplifier.  
In addition to a preamplifier output/power amplifier input link,  
there shall also be a line-level balanced XLR output. The  
mixer amplifier shall operate from either a standard 120 V  
ac 50/60 Hz or a 24V dc power source, and measure 13.3  
cm (5.2 in.) high x 48.0 cm (18.9 in.) wide x 32.0 cm (12.6  
in.) deep. The net weight shall be 11.5 kg (25.4 lb). The  
mixer amplifier shall be the Electro-Voice ® Model MA-1212.  
There is also a 24v dc power option to operate the unit off  
of a 24v emergency power source. The speaker output is  
available at a barrier strip, which includes terminals for  
driving low impedance loudspeaker loads, as well as 25,  
70.7 or 100 volt distributed systems.  
Architects’ and Engineers’ Specifications:  
The mixer amplifier shall have twelve input channels, with  
individual mix gain controls. Input channels 1 through 10  
shall be configured for either low-Z balanced microphone  
operation or hi-Z line level signals via switches on the rear  
panel. A signal present channel 1 shall trigger the muting  
of channels 2-12. The mute circuit shall be defeatable using  
a switch on the rear panel. Inputs 1 - 10 shall be available  
via combination female XLR / ¼” connectors. Inputs 11  
and 12 shall accept either monaural or stereo sources. If  
a stereo source is connected, it shall be properly mixed to  
mono via a resistor network mounted on the input plate.  
There shall be a paging input that accepts a 600-ohm line-  
level feed from a phone system. When a signal is present  
 

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