The Mic and Inst switches on the front of the unit determine which of the inputs is
used. The Mic switch is dominant - when it is lit, the Mic input is always used. When
the Mic switch is not lit, the Inst switch determines whether the Inst or Line input is
used: when the Inst switch is lit, the Inst input is used; when the Inst switch is not lit,
the Line input is used. These switch positions are shown in the above diagram:
Setting the Gain
Depending on the input you are using, you may use either the Mic rotary control or
the Input Trim rotary control to set the gain:
Input
Rotary control
Mic
Mic and Input Trim
Inst or Line
Input Trim
Use the meter and the correct rotary control to match the incoming level and gain to
the internal operating level. With an input signal coming into the channel, watch the
meter as you use the rotary control to modify the gain, and set the control so that
the meter registers between -3 VU and 0 VU. This sets the level above the noise
level of the unit, and leaves room for any sudden increase in performance level (it
gives about 20 dB of usable headroom).
Off position: To turn off the Input Trim (for example, when using the mic input), set
the control in its centre (click) position. There is no off position for the Mic rotary
control, since it only operates when using the mic input.
f u n c t i o n s
7
ii
Mic switch lit, Mic input is dominant
Inst switch is lit, the Inst input is used
When the Mic & Inst switch are not
lit, the Line input is used
