TOA M-243 L Rack Mount Mixer

ITEM #: TOA-M-243L MFG #: M-243 L

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M-243 L - Overview

The TOA M-243 is a highly flexible rack mount mixer with
two monaural and four stereo inputs, plus one stereo and
two mono outputs. There are also mix bus .sub-inputs. and
a stereo record output. It is designed especially for
commercial systems that require mixing and matrixing a
combination of mono and stereo audio sources to one or
several outputs, and in which stereo sources may have to
be summed to mono and monaural sources sent to L/R
The compact, single rack space M-243 can be easily
configured to serve as anything from a single mono or
stereo mixer to a mixer with six regular inputs and three
outputs. Each output also has its own separate sub-input.
The M-243 is ideal for a variety of systems, including
boardrooms, conference rooms, health clubs, restaurants
and background music (BGM) applications. For example,
in a restaurant, the M-243 can simultaneously and
separately control stereo classical music in the dining room,
stereo easy listening music in the bar and foyer, plus BGM
and paging of customers when their tables are ready.
The M-243 has two monaural line inputs (#1 and 2) that are
switchable between balanced XLR microphone level or
unbalanced 1/4" phone line level, and four unbalanced L/R
stereo inputs (#3~6) with RCA-type jacks. Input 6 has both
RCA type and 1/4" phone jacks connected in parallel. Each
of the inputs has its own volume control and a set of three
assignment switches for assigning the input to any
combination of the three outputs. The two monaural inputs
each have an automatic compressor to prevent excessive
input signals from clipping the mixer output. Each also has
a high pass filter to filter out unwanted low frequencies,
particularly for speech use, and a -20dB pad in the mic
input circuitry to accommodate high output or close-talked
microphones. Filter and pad on/off switches are internal to
prevent any tampering.
The M-243 has other line level inputs: a L/R stereo sub-input
and mono sub-inputs 1 and 2. These directly feed the
mixing buses and their associated outputs. The stereo
sub-input is configured so that by connecting a monaural
signal to the left channel, it will be fed to both the left and
right output channels. Among other applications, one of the
monaural outputs could be fed into the stereo sub-input as
a sub-group mix for the stereo output.
A unique feature of the M-243 is an automatic muting
function (switchable on/off). This detects signal on either of
the monaural inputs and mutes any of the stereo input
signals assigned to the L/R stereo output. This is very
useful for priority paging that auto-mutes BGM or for
automatic program selection. For example, in a sports
lounge, the TV audio could automatically mute the BGM
whenever the TV is turned on. Meanwhile, because the
stereo input assignments to the mono outputs are
unaffected, the same BGM signal could still go
uninterrupted to the associated restaurant system that is
being fed from one of the mono outputs.
Three sets of output mixing buses are provided to feed the
three sets of main outputs: L/R Stereo, Mono 1 and Mono 2.
Each output has a separate volume control on the front
panel. The L/R Stereo output also has bass and treble
shelving-type tone controls. Each of the mono outputs has
an internal switch that allows it to function as a sum of the
stereo output. There is also a L/R stereo recording output
from the L/R stereo mix bus prior to the output EQ and
Other features include provision of colored control knobs for
the different control functions; a clipping indicator that lights
when any signal in the output section reaches 3dB below
clipping; an internal ground lift switch that separates the
audio and chassis grounds to avoid ground loops; an
included security cover for the assignment switches and a
power switch with a power-on indicator. The M-243
occupies only one standard 19" EIA rack and includes
removable rack mounting ears.

M-243 L - Required Accessories

    M-243 L - Recommended Accessories

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