STEREO INPUT CHANNEL
STEREO INPUT L & R
These inputs accept 3-pole A gauge (TRS) jacks. Use these inputs for sources such
as keyboards, drum machines, synths, tape machines or as returns from processing
units. The inputs are 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.
INPUT +4/-10
Most professional equipment uses input and output levels of +4dBu, but
semi-professional tape machines or hi-fi systems use a lower level of -10dBV. This
switch allows you to match the sources
connected to the Stereo input jacks to either standard, which is important to ensure the best possible sound quality. If
you are not sure what input level is appropriate, start with the switch UP to 4dBu. If you are unable to achieve
an adequate signal level (even with the fader at maximium), press the switch in for -10dBV.
HF EQ
Turn to the right to boost high (treble) frequencies, adding crispness to percussion from drum machines, synths and
electronic instruments. Turn to the left to cut these frequencies, reducing hiss or excessive brilliance. Set the knob in the
centre-detented position when not required. The control has a shelving response giving 15dB of boost or cut at a fixed
frequency.
LF EQ
Turn to the right to boost low (bass) frequencies, adding extra punch to synths, guitars and drums. Turn to the left to
reduce hum, boominess or improve a mushy sound. Set the knob to the centre-detented position when not required. The
control has a shelving response giving 15dB of boost or cut at a fixed frequency.
AUX SEND 1
This is used to set up a separate mono mix for FOLDBACK, EFFECTS or recording, and the combination of all the Aux
1 Sends is mixed to the Aux 1 Output. For Effects it is useful for this to fade up and down with the FADER (this is called
POST-FADE), but for Foldback or Monitor feeds it is important for the send to be independent of the FADER so that, for
instance, the mix to artists headphones is not affected by changes in fader level (this is called PRE-FADE). The Master
Section AUX1 PRE switch allows you to chose pre- or post-fade across the whole mixer as required. Leave the knob
turned down when not in use.
AUX SEND 2
This is similar to the Aux Send 1 control, but is always POST-FADE.
BALANCE
This control sets the amount of the channel signal feeding the Right and Left MIX outputs, allowing you to balance the
source in the stereo image. When the control is turned fully right or left you feed only that side of the signal to the mix.
Unity gain is provided by the control in the centre-detented position.
FADER
The linear FADER gives you smooth control of the overall signal level in the channel strip, allowing precise balancing of
the various source signals being mixed to the Master Section. It is important that the input level is set correctly with the
+4/-10 switch to give maximum travel on the fader which should normally be used at around the 0 mark. See the
Initial Setting Up section on page 10 for help in setting the right level.
Hot (+ve)
Cold (-ve)
Gnd/Screen
Signal
Gnd/Screen
Gnd/Screen
Tip
Ring
Sleeve
Unbalanced
Balanced
SPIRIT FOLIO
13
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