Owner's Manual

10
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)