Soundcraft EPM12 [10/36] Line input

WIRING UP

Please refer to pages 30/31 for additional wiring details.

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 20dB less sensitive. This is suitable for most line level sources.

Line Input

Accepts 3-pole ‘A’ gauge jacks, or 2-pole mono jacks which will automatically 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

interference 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 ‘A’ gauge 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 load 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)