SoundCraft MPM 20/2 - Manual (Page 16)

16
STEREO INPUT CHANNELS
1 INPUTS STEREO 1/2
These inputs accept 3-pole 6.35mm (1/4") jacks. Use these inputs for sources
such as keyboards, drum machines, synths, tape machines or processing units. The
inputs are BALANCED for low noise and top quality from professional equipment,
but you can use UNBALANCED sources by wiring up the jacks as shown in the
‘Wiring Up’ section earlier in this manual, although you should then keep cable
lengths as short as possible. Mono sources may be used by plugging into the left
jack only.
2 GAIN
The GAIN control sets the level of the channel signal.
3 EQUALISER
HF EQ
Turn to the right to boost high (treble) frequencies, adding crispness to percussion
from drum machines, synths and electronic instruments. Turn to the left to cut these
frequencies, reducing hiss or excessive brilliance. Set the knob in the centre-detented
position when not required. The control has a shelving response giving 15dB of
boost or cut at 12kHz.
LF EQ
Turn to the right to boost low (bass) frequencies, adding extra punch to synths,
guitars and drums. Turn to the left to reduce hum, boominess or improve a mushy
sound. Set the knob to the centre-detented position when not required. The control
has a shelving response giving 15dB of boost or cut at 60Hz.
4 AUX SENDS
These are used to set up a separate mixes for FOLDBACK, EFFECTS or recording, and
the combination of each Aux Send is mixed to the respective Aux Output at the rear
of the mixer. For Effects it is useful for the signal to fade up and down with the fader
(this is called POST-FADE), but for Foldback or Monitor feeds it is important for the
send to be independent of the fader (this is called PRE-FADE).
AUX SENDS 1 and 2 are both globally switchable between pre and post-fade (see
master section on page 20/21). The send pots are fed with a mono sum of the L &
R signals. Aux 3 is always post-fade.
5 BALANCE
This control sets the amount of the channel signal feeding the Left and Right MIX
buses, allowing you to balance the source in the stereo image. When the control is
turned fully right or left you feed only that side of the signal to the mix. Unity gain is
provided by the control in the centre-detented position.
6 MUTE
All outputs from the channel are enabled when the MUTE switch is released and
muted when the switch is down. The MUTE switch’s inbuilt LED glows when the chan-
nel is muted.