SoundCraft Spirit Folio 4 - Manual (Page 6)

#
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 select
+4dBu. If you are unable to achieve an adequate signal level, 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.
These sends are always PRE-FADE, POST EQ
and are not affected by the position of the ON
switch. They would typically be used for
Foldback or Monitor feeds, for which it is
important that the send should be independent
of the fader so that, for instance, the mix to
artists headphones is not affected by changes in
fader level.
The EQ switch disables the
equaliser when released and
activates it when pressed. It
would typically be used for
simple comparison of the
equalised and unequalised
signals.
For further detail
see page 16
e