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
|
ConnectPRO Computer Monitor 16 Port KVM User Manual
Craftsman Air Compressor 92116638 User Manual
Danby Dishwasher DDW396W User Manual
Dual CD Player XDM6220 User Manual
Duracell Battery Charger Ultra CR2 User Manual
Dyson Fan AM 01 User Manual
Electro Voice Portable Speaker FM 1502ER User Manual
FujiFilm Digital Camera 2600 Zoom User Manual
GE Air Conditioner AZ41E09DAC User Manual
Generac Power Systems Portable Generator 00802 3 User Manual