953.028UK User Manual
For the FM tuner to function correctly, it is advisable to connect an FM aerial to the F type antenna connector
(30)
If available, connect a 24V trigger from an alarm panel to the alarm contacts (17) to mute all except channel 1
in an emergency. (The 24V contacts can be connected with either polarity +/- or -/+ to operate)
Connect the rear IEC inlet (16) to the mains using the supplied mains lead (or an equivalent approved type).
Ensure that the supply voltage is correct for this equipment and that the mains outlet is switched on.
Operation
Ensure that amplifier(s) or active speaker(s) are switched off before powering up the MM321 mixer.
Switch on the power and the Power LED indicator should light (15)
Switch on power to the amplifier or active speaker(s) and turn volume(s) up part way. Turn up the MM321
Master level (13) half-way.
If connected, speak into a microphone whilst gradually turning up its channel level control (6, 7 or 8)
If no microphones are connected, a line input or internal media player (see below) can be used for checking.
The L+R output meters (14) should light up and the sound should be heard through the connected speakers.
Increase the Master output level if required and set the relevant channel level control to the required volume.
Repeat the above steps for all connected inputs whilst balancing the levels between channels as required.
For the AUX line inputs, a single rotary control for each (9, 10) adjusts the level of both left and right RCA
inputs.
Channel 1 input also has an override function which attenuates all other channels when there is a signal on
Ch.1
Turning the CH.1 Override Level control clockwise increases the amount that it mutes all other channels.
Sensible use of the output meters (14) will help to avoid overdriving the outputs and/or connected amplifiers.
The +10dB LED should only light briefly on percussive or transient parts of the sound (i.e. bass drum)
If the +10dB LED is lit for any longer than short bursts, the level controls will need to be turned down.
This will avoid signal clipping and overdrive, which can be damaging to equipment connected to the outputs.
For overall tone adjustment, moving the BASS and TREBLE EQ controls (11, 12) can help to tailor the sound
quality as required.
If the sound is too thin sounding, turn up the BASS rotary. If it is too deep sounding, reduce the BASS level.
If the sound is not very clear, turn up the TREBLE rotary. If it is too harsh sounding, reduce the TREBLE level.
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