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4.18 B400 Functional Description
SStteerreeoo MMaasstteerr MMoodduullee
PPOOWWEERR SSUUPPPPLLYY SSTTAATTUUSS
The three LEDs provide visual confirmation that the 48V phantom power, +17V
& -17V Audio Supplies, and the +5V Logic Supply are all present.
OONN--AAIIRR
The ON-AIR switch,when activated, will close a set of normally-open relay con-
tacts. It also disables the oscillator and some talkback facilities provided by the
Communications Module.
The On-Air switch may also be operated externally via the opto-isolated connec-
tions on the rear panel.
AAuuxx MMaasstteerr SSeeccttiioonn
AAUUXX MMAASSTTEERRSS
Master controls are provided for each of the four auxiliaries. The rotary control
sets the final output level and the associated AFL button allows you to listen to the
After-Fade Signal via the Cue System.
SStteerreeoo MMaasstteerr SSeeccttiioonn
IINNSS
When the INS (Insert) button is depressed, the signal paths (left and right) are
routed via the insert return XLRs (there is a separate XLR for the left and the right
signal). When the INS button is released the signal paths are routed internally.
Note that the signals are always available on the insert send XLRs, irrespective of
the position of the INS switch.
LLIIMMIITTEERR
The limiter is located post-insert.
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The 4-position rotary THRESHOLD switch sets the signal level (in dBr) at which
the limiter starts operating.
GGAAIINN RREEDDNN ((GGaaiinn RReedduuccttiioonn))
The 8-LED GAIN REDUCTION meter shows the extent to which the limiter is
reducing the gain.
FFAASSTT AATTTTKK ((FFaasstt AAttttaacckk))
The FAST ATTACK switch gives a choice of attack times: 10msec when the
switch is released, 0.5msec when the switch is depressed.
RREELL ((RReelleeaassee))
The RELEASE control allows you to select a limiter release time from 200msecs to
10secs.
The AUTO switch gives a preset release time of one second with a 2-stage
release action.
IINN
Pressing the LIMITER IN switch places the limiter in-circuit.