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B400 Functional Description 4.3
MMFF
The upper, larger knob of the MF section allows you to cut or boost the High Mid-
Range bell-response filter by up to 15dB. The Mid-point frequency is sweepable,
using the lower knob, between 250Hz and 4kHz. The Q-factor of the filter is fixed
at 1.4.
LLFF
The LF knob provides 15dB cut or boost of the LF shelving filter.
EEQQ
The EQ section may be switched in and out of circuit via the EQ switch. The
switch illuminates when pressed to indicate that the EQ is switched in.
HHPPFF
The variable frequency HIGH PASS FILTER is controlled by a rotary pot, covering
32Hz to 500Hz. Turning the control fully anticlockwise to the click-stop position
switches the filter out of circuit.
PPAANN
The Pan control allows the input signal to be positioned within the stereo image of
the main stereo mix. The PANned signal is routed via the five buttons (21) at the
top of the module to any combination of the four pairs of Groups (1-2, 3-4, 5-6, 7-
8) and to the stereo master bus (ST). Pan left sends the signal to odd-numbered
busses, and pan right sends the signal to even-numbered busses. When the PAN
switch is released the pre-pan signal is sent to all groups.
OONN
The channel is turned on when the ON switch is pressed, or may be muted under
the control of a remote mute signal via the 25-way D-type connector on the rear
panel. When the channel is ON and the fader is open, this is used as a cough mute
in mic mode. Also in mic mode, when the fader is raised, the relevant monitors
will be muted or dimmed depending on the internal jumper settings. A relay con-
tact output pair for a mic live indicator is also provided on the D-type connector.
The Fader Open control signal can be set via an internal jumper to Rem Com on
the Stereo Master fader. Monitor mutes will therefore not be activated until the
stereo master fader is open.
EEXXTT MMUUTTEE LLEEDD
The EXT MUTE LED glows to indicate that a remote mute is active (see above).
CCUUEE
The cue system is activated by pressing the CUE button. The CUE button may
be operated in latched or momentary mode, depending upon how long you hold it
down. If you press and release within approximately 0.5 seconds the button will
latch. If, on the other hand you press and hold for more than 0.5 seconds then the
cue will remain momentary.
When the CUE switch is active, and the fader is in its fully-down position, the PFL
signal will be put onto the Cue L & R busses irrespective of the AFL/PFL master
setting on the Monitor Module.
The CUE button may be (optionally) reset by moving the fader away from the
fully-down position.
If the CUE button is pressed when the fader is already away from the fully-down
position the AFL/PFL signal will be selected according to the setting of the
AFL/PFL master switch on the Monitor module.