SoundCraft Spirit Monitor Line Input, Phase Reverseø, Line Select, Gain Control, HI-PASS Filter

	The insert point allows limiters, compressors and other signal
	processing units to be added as required to particular input
	channels and because it is located PRE EQ, noise generated by
	the external equipment may be reduced by a small amount of
	H.F. cut in the Equaliser.
3.	LINE INPUT
	The LINE Input is a 3-pole 1⁄4"‘‘A’ gauge jack socket, to accept
	balanced or unbalanced line level sources when the LINE
	switch(5) is pressed. Unlike the low impedance Microphone
	input, this stage presents a high impedance(>10kΩ) to the in-
	put signal, enabling many types of instruments to be plugged
	straight in without D.I. boxes or external preamplifiers.
4.	PHASE REVERSE(Ø)
	The PHASE REVERSE switch reverses the polarity of the se-
	lected input, providing a convenient method of compensating
	for incorrect wiring or microphone placement. In some cir-
	cumstances it may be found that pressing PHASE REVERSE
	will help with feedback avoidance. The switch should nor-
	mally be released when not required.
5.	LINE SELECT
	The LINE switch selects Line input when pressed, and Micro-
	phone input when released. When Line is selected the Gain
	range is reduced by 20dB(see 6 below).
6.	GAIN CONTROL
	When the Microphone input is selected this control acts as a
	SENSITIVITY control covering a 50dB range. Channel signal
	level increases as the control is turned clockwise. When the
	Line input is selected it serves as a GAIN control, with the
	scaling reduced by -20dB from the printed scale. A nominal
	0dB input signal will pass through at unity gain, with the
	knob set at the 20dB position. Some audio equipment, par-
	ticularly that intended for domestic use, operates at a nominal
	-10dBV level and an increased Gain setting will be required.
7.	HI-PASS FILTER
	Pressing this switch inserts a 12dB per octave 100Hz Hi-Pass
	Filter in the signal path, immediately after the input amplifier.
	This is particularly useful on live vocals, and its use is
	strongly recommended, even on male vocals. It can also be
	used for filtering out noise such as stage rumble.

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