Operation Manual

USER GUIDE
12
WIRING UP
Please refer to pages 35/36 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 close-miked 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 guitars. 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.
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)
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!