SoundCraft SM12 User Manual page 32

Master Module
External Input
7
The MONO switch sums the external signal to mono before it is fed to the stereo
mix.
8
A stereo external input, from XLRs on the rear connector panel, may be added
to the mix buses. The inputs are balanced with a sensitivity of +4dBu. The EXT
IN control adjusts the level of the external signals, with 10dB of gain fully
clockwise.
9
The latching ON switch activates the external input.
10
The momentary LSTN (listen) switch provides a mono pre-fade, pre-ON solo
to the 'phones or wedge output. LISTEN is not affected by the AUTO CANCEL
or SOLO CLEAR functions, and overrides any output AFLs if INPUT PRIORITY
is active. Pressing LSTN does not cancel other solos.
Stereo Mix
The stereo mix path is similar in function to the group outputs, but provides a stereo
output.
11
The 100mm stereo mix FADER controls the level of the signal from the
summing amplifiers. This stereo signal is fed to the left and right insert sends and
ultimately to the left and right outputs, with 10dB of gain at the maximum.
Insert Point
The inserts are postfade, using electronically balanced sends and returns at a
nominal level of +4dBu. The insert SENDs and RETURNs are on separate 1/4"
jacks on the rear connector panel.
12
Both left and right inserts may be bypassed using the INSERT OUT switch.
Note that the sends are always active.
AFL
13
The electronically latching AFL switch, which has an integral amber LED,
feeds the stereo post-fade, post-insert signal to the engineer's wedge speakers and
phones output.
14
The PRE INSERT switch moves the AFL signal before the insert point.
15
The AFL TRIM pot gives +/-10dB of level adjustment.
Talkback
16
The momentary TB switch activates the signal from the TALKBACK
MICROPHONE and feeds it to the stereo mix output; it is independent of the Fader
position and the CUT switch. The stereo output is dimmed by 6db, and the
engineer's wedge speaker is dimmed by 20dB while the TB switch is active.
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