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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
input signal, enabling many types of instruments to be
plugged straight in without D.I. boxes or external
preamplifiers.
Line inputs will be found useful as extra Effects Returns,
where additional post-effect equalisation is required.
4 . I N SERT
The INSERT is a break point in the input channel signal path.
It allows the signal to be taken out of the mixer, through an
external piece of equipment and then back into the mixer to
continue through to the final output. The Insert is a 3-pole
1
⁄
4
"
‘A’ gauge Jack Socket, which is normally by-passed. When a
jack plug is inserted, the signal path is broken at a point just
after the Hi-Pass Filter, but before the EQ section. The signal
from the channel appears on the TIP of the plug and is
returned on the RING. 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.
5 . LIN E SELEC T
The LINE switch selects Line input when pressed, and
Microphone 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,
particularly that intended for domestic use, operates at a
nominal -10dBV level and an increased Gain setting will be
required.
INPUT
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