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16 Soundcraft MFXi MPMi User Guide Issue 1210

WIRING UP

Mic Input

The MIC input accepts XLR-type connectors and is designed to suit a wide

range of BALANCED or UNBALANCED low-level signals, whether from

delicate vocals requiring the best low-noise performance, or drum kits

needing maximum headroom. Professional dynamic, condenser or ribbon

mics are best because these will be LOW IMPEDANCE. While you can

use low-cost HIGH IMPEDANCE mics, you do not get the same degree of

immunity to interference on the microphone cable and as a result the level

of background noise may be higher. If you turn the PHANTOM POWER on,

the socket provides a suitable powering voltage for professional condenser

mics.

The input level is set using the input GAIN knob.

The LINE input offers the same gain range as the MIC input, but at a higher

input impedance, and is 15dB less sensitive. This is suitable for most line

level sources.

Line Input

Accepts 3-pole 6.35mm (1/4”) jacks, or 2-pole mono jacks which will auto-

matically ground the ‘cold’ input. Use this input for sources other than mics,

such as keyboards, drum machines, synths, tape machines or DI boxes. The

input is BALANCED for low noise and immunity from interference, but you

can use UNBALANCED sources by wiring up the jacks as shown, although

you should then keep cable lengths as short as possible to minimise inter-

ference pick-up on the cable. Note that the ring must be grounded if the

source is unbalanced. Set the input level using the GAIN knob, starting with

the knob turned fully anticlockwise. Unplug any MIC connection when using

the LINE input.

Insert Point

The unbalanced, pre-EQ insert point is a break in the channel signal path,

allowing limiters, compressors, special EQ or other signal processing units

to be added in the signal path. The Insert is a 3-pole 6.35mm (1/4”) jack

socket which is normally bypassed. When a jack is inserted, the signal path

is broken, just before the EQ section.

The signal from the channel appears on the TIP of the plug and is returned

on the RING, with the sleeve as a common ground.

The Send may be tapped off as an alternative pre-fade, pre-EQ direct output

if required, using a lead with tip and ring shorted together so that the signal

path is not interrupted.

WARNING !

Start with the input GAIN knob turned fully anticlockwise

when plugging high level sources into the LINE input to avoid

overloading the input channel or giving you a very loud surprise!

DO NOT use UNBALANCED sources with the phantom power

switched on. The voltage on pins 2 & 3 of the XLR connector may

cause serious damage. BALANCED dynamic mics may normally be

used with phantom power switched on (contact your microphone

manufacturer for guidance)

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