Instruction Manual

170.881UK User Manual
Mic/Line Input Section
Channel inputs and inserts are provided as XLR and/or 6.3mm jack sockets.
The connections for these inputs are assigned as follows.
1. MIC input Connect a balanced microphone to this XLRF input. An unbalanced
microphone can be connected provided that +48V phantom power
is not used. Wired as follows.
2. LINE input Connect balanced or unbalanced line level signals to this 6.3mm
TRS jack input. Wired as follows.
3. Channel INSERT The channel signal can be diverted for external processing and
returned back to the channel by connecting a TRS jack to 2 x
mono jack lead to this connector.
The channel inserts are post Low Cut but are pre-EQ.
Wired as follows.
4.
5. +48V Phantom Press in this switch to apply +48Vdc voltage to the XLR input condenser
microphones and D.I. boxes which require phantom power
6. LOW CUT Press in this switch to apply a 75Hz 18dB/oct low frequency roll-off filter which
can help to reduce popping, rumble and handling noise from vocal microphones.
7. GAIN control This control trims the input signal to the optimum level for the channel strip circuitry.
Too low a signal level can result in a weak signal-to-noise ratio and too high can result
in overload and distortion in the signal output.
The adjacent SIG and CLIP LEDs will give an indication of the signal level.
Ideally, the Gain rotary control should be adjusted so that the green SIG LED is lit and
the loudest passages of the input signal (e.g. bass drum beats) will just momentarily
trigger the CLIP LED. Anything longer than a momentary flicker of the CLIP LED means
that the Gain should be reduced. Using the PFL button further down the channel strip
gives a more detailed view of the channel level on the main VU LEDs.
Balanced
Pin 1 = Ground
Pin 2 = Signal +
Pin 3 = Signal –
Unbalanced
Pin 1 = Ground
Pin 2 = Signal +
Pin 3 = Ground
Balanced
Tip = Signal +
Ring = Signal –
Sleeve = Ground
Unbalanced
Tip = Signal +
-
Sleeve = Ground
TRS jack
Tip = Send
Ring = Return
Sleeve = Ground
Left mono jack
Tip = Send
-
Sleeve = Ground
Right mono jack
Tip = Return
-
Sleeve = Ground