10
WIRING UP
Please refer to pages 38/39 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 deli-
cate 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 back-
ground 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 unbal-
anced. 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 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)
Summary of Contents for EFX12
Page 1: ...1 User Guide User Guide User Guide User Guide User Guide TM TM...
Page 14: ...14 BLOCK DIAGRAM...
Page 38: ...38 TYPICAL CONNECTING LEADS...
Page 39: ...39...
Page 41: ...41...
