F R O N T PA N E L
PA G E 4
M X 8 8 3 I N S TA L L AT I O N & O P E R AT I O N M A N U A L
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GAIN
TRIM
This control is used to adjust the input gain and affects both the XLR and
the RCA inputs. The input gain can be adjusted by +/- 15dB. This allows
a wide rage of program sources to be set up with optimum gain structure.
With the gain trim in the centre position, the boost/cut is set to 0dB. See
the block diagram on page 10 for details of the gain structure.
LEVEL
Controls the level of the input signal.
INPUT STATUS LEDS
Each input has an LED status indicator. The LED is green when there is
signal present and red if the signal is approaching clip. If the LED begins
to light red this would indicate the internal signal level is 6dB before clip.
Note that the front panel level control is post status LED and as such, the
status LED is NOT affected by the level control. If an input channel is clip-
ping use the gain control to adjust the correct amount of input level.
CHANNEL TONE CONTROLS
Each input has a 2 band EQ.
Bass – +/-12dB 100Hz shelving
Treble – +/-9dB 10kHz shelving
BUS SELECT SWITCHES
These switches connect each input to the left, right or aux outputs. The
LED above the switch indicates when the channel is being routed to the
respective output.
For stereo inputs the left signal only is routed to the left bus, the right
signal only is routed to the right bus, and a mono summed signal is sent to
the aux bus.
LEFT, RIGHT AND AUX MASTER
These pots control the overall mixed output level for the left, right and aux
channels respectively.
LEFT, RIGHT AND AUX VU DISPLAY
These VU displays indicate output level for the left, right and aux
channels respectively.
LEFT AND RIGHT GRAPHIC EQ
These 5 band EQ sections are constant Q fi lters with centers at 100Hz,
300Hz, 1kHz, 3kHz and 10kHz. Each fi lter has a range of 12dB cut and boost.
HEADPHONE
This 1/4” jack socket allows headphones to be used for monitoring. It can
be set as pre or post master volume control. It can also be set to listen to
the aux output, pre or post aux fader. See “Internal Settings” on page 6.
Default factory setting is pre master volume control.
POWER
SWITCH
This switch switches power from the mains. The up position is on.
POWER ON LED
This indicates there is power to the unit.
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