Fully tested, this unit is from a small conference facility where it was used in a corporate board room. Comes with the clear plexi security cover. Out of the box these models will drive 8Ω or 70 Volt lines, accept any type of input including phone lines. It has a multitude of features that make it a great mixer for just about any application.
The CMA line comes complete with the following features:
Line Out: This RCA phono jack provides an unbalanced line-level
output from the mixer. Line Out is after Stacking In, Loudness,
Tone, Compressor, & Master Level, but before Low Cut.
Rec Out: This RCA phono jack provides an unbalanced line-level
output from the mixer. Rec Out is after Stacking In, but before
Loudness, Tone, Compressor, Master Level, & Low Cut.
Pre Out: This RCA phono jack provides an unbalanced line-level
output from the mixer. Pre Out is after Stacking In, Loudness, &
Tone, but before Compressor, Master Level, & Low Cut. Pre Out
and Amp In may be used together as an insert point for signal
processing or remote control devices. Remove jumper before
connecting devices. To connect Pre Out to both Amp In and an
external device, a parallel (‘Y’) cable must be used.
Amp In: This RCA phono jack provides an unbalanced line-level
input to the amplifier. Amp In is after Stacking In, Loudness, &
Tone, but before Compressor, Master Level, & Low Cut. Pre Out
and Amp In may be used together as an insert point for signal
processing or remote control devices. Remove jumper before
connecting devices.
Compressor: This control adjusts the threshold level at which the
internal compressor circuit is activated. The internal compressor
has a fixed compression ratio of 4:1, and is used to reduce peaks
in output signal level, as well as to moderate volume differences
between loud and soft signals.
Auto Mute: This control adjusts the threshold level at which
signals from "priority" channels will automatically trigger muting of
selected non-priority channels (see Assignment & Priority below).
Remote Level: These two screw terminals (plus "") provide
remote volume control of the master level. An internal voltage
controlled amplifier (VCA) allows remote control from up to 2000
feet away, using any 5k~50kΩ linear taper potentiometer and/or
switch to provide adjustment and/or muting of the master level.
Potentiometers are wired with high-side to "+10V", low-side to "",
and wiper to "C". Switches simply connect (or disconnect) "+10V"
to "C", and do not require a ground (‘’) connection. NOTE: The
factory installed jumper (between "+10V" & "C") must be in place
when a remote control is not being used.
Mute/Chime: This screw terminal (plus "") allows manual muting
of any selected channels, via an external switch or contact closure
(see Assignment & Priority below). When the Chime Level control
is turned up (on), a pre-announcement chime tone will also be
activated by the switch or contact closure.
Stacking In: These screw terminals provide a balanced line-level
input to the mix bus, for input expansion. Stacking In is before
Loudness, Tone, Compressor, Master Level, & Low Cut. For
unbalanced input, wire high to (+) and ground to both (-) & ().
Assignment: These five DIP switches are used to assign specific
functions to the individual channels. To assign a function, move
the respective switch to the left. Phantom Pwr assigns +24 Volts
DC phantom power to the channel input, for powering condenser
microphones. CAUTION: TO AVOID DAMAGE TO EQUIPMENT, ASSIGN
PHANTOM POWER ONLY ON CHANNELS WHICH ARE SELECTED FOR 'MIC'
INPUT AND WHICH REQUIRE PHANTOM POWER. Auto Mute assigns a
(non-priority) channel to be muted whenever signal is present in
any "priority" channel. Manual Mute assigns a channel to be
muted whenever the Mute/Chime terminals are shorted together
via a switch or contact closure. Mute Level assigns the amount of
muting (-10dB, -20dB, or -40dB) which is applied to a channel,
when triggered by either Auto Mute or Manual Mute. NOTE:
-10dB muting will occur when both switches are to the right.
-40dB muting will occur when both switches are to the left.
Trim: This control adjusts the input gain of the channel, to
compensate for various input signal levels. Once the Line/Mic
switch has been set to the proper position (see Line/Mic below),
the Trim control should be adjusted so that peaks in signal level do
not cause distortion at the channel input.
Priority: This switch assigns a channel to "priority". When signal
is present in a "priority" channel, any (non-priority) channels which
are assigned to Auto Mute will be muted by their selected amount.
NOTE: A "priority" channel cannot be auto muted by another
"priority" channel, but a "priority" channel can be manual muted.
Line/Mic: This switch selects the proper impedance and gain for
either microphone or line-level input signals. Depress the switch
for line-level input. Release the switch for microphone input. On
Channel 1, the Tel switch (see Tel below) must be released for the
Line/Mic switch to operate.
Tel (Channel 1 only): This switch selects the proper impedance
and gain for input from 600 ohm sources. The input for Channel 1
includes an isolation transformer, which allows connection to most
telephone system audio ports.
Inputs: These screw terminals provide a balanced input
connection for the channel. For unbalanced input, wire high to (+)
and ground to both (-) & (). The input for Channel 1 includes an
isolation transformer. Input isolation transformers are optional on
the other channels (2~6) of all models, except for the CMA350
(Biamp #908-0040-00).
The CMA Series of commercial mixer/amplifiers combines a versatile 6-input mic/line mixer with either 30, 60, 120, or 350 Watt amplification. Mixing functions include mic/line/telephone inputs, selectable automatic & manual channel muting, channel priority assignment, remote level control, tone control, a built-in compressor, an internal chime, phantom power, and extensive output patching. The amplifier includes an output transformer, and provides rated
power into direct or distributed speaker systems. The CMA Series carries a
five-year warranty.
CMA Series features include:
♦ integrated mixer, power amplifier, and output transformer
♦ five electronically balanced microphone/line input channels
♦ one transformer balanced microphone/line/tel input channel
♦ rear panel trim control & pad switch on each input channel
♦ +24 Volt phantom power selectable on each input channel
♦ imput transformer option on mic/line inputs (except CMA350)
♦ automatic muting of selected channels (-10, -20, or -40dB)
♦ automatic muting triggered by selected "priority" channels
♦ manual muting of selected channels (-10, -20, or -40dB)
♦ manual muting triggered from remote contact closures
♦ remote control of master level via rear panel terminals
♦ integral output compressor with rear panel threshold control
♦ recessed treble & bass controls plus "loudness" & "low-cut"
♦ two insert points for signal processing and remote control
♦ two line-outs and one stack-in for system interconnections
♦ 30, 60, 120, or 350 Watts into direct or distributed systems
♦ front panel indicators for power, fault, signal, and peak
♦ internal 'pre-announcement' chime tone with level control
♦ input/output connections provided on barrier strip terminals
♦ integral security cover and removable rack-wing/handles
