M
onitor Level Calibration
The monitor calibration system enables the level of any loudspeaker connected to the AWS to be trimmed by ±10dB. Note
that with the monitor gain at maximum a trim level of +10dB corresponds to unity gain through the monitor section.
Do not attempt to carry out loudspeaker calibration unless you have accurately calibrated test equipment.
Locate the console oscillator (above the TFT screen), press OSC ON and select the PINK ON
button; the default level for the console’s pink noise output is +4dBu RMS. This calibrated level can
be adjusted using the ‘Pink’ trim pot below the Level control.
S
et the monitor level control to the position you wish to correspond to the calibrated level. A level
of 8.5 will provide 10dB of additional gain in hand.
Now select the monitors to be calibrated using the LS SELECT buttons in the monitor panel.
Select CAL in the first layer of MONITOR OPTIONS. Pressing either AL,
AR or AC will send pink noise to the Left, Right or Centre loudspeaker
respectively.
Adjust the level for the required SPL (eg. 85dBa C weighting, slow response, on
a suitably calibrated dB meter), by turning the main monitor pot left or right
from its initial position.
Now work through the rest of the speakers (see below), checking before you calibrate the LFE output whether the LFO
option (see previous page) is off or on.
85dB calibrated level – please see following page.
Selecting NEXT produces a second layer of calibration options:
Selecting ALS, ARS or ALF allows you to trim the Left Surround, Right
Surround or LFE channels respectively by ±10dB, using the method described
above.
LFG (Low Frequency Gain) allows the gain of the contribution from the full
bandwidth channels to the subwoofer output to be adjusted. Like all the speaker
calibration settings it must be set for each set of speaker outputs (assuming
bass management is in use):
Having lined up the six main speakers, select LFG. All speakers will initially be muted, and the six monitor cut buttons will
light. Un-cut the left output and with the bass management turned on (note that the BMN selection in the BASS menu
is duplicated in the CAL menu) adjust the LFG gain for a flat low end response. Cut the left output, un-cut the right output
and check this has a flat low end response. Repeat for all channels. Depending on how well matched the monitors are you
may have to adjust the LFG gain slightly.
Note that when LFG is on, the LFE monitor output is always cut. This does not mute the actual subwoofer output, only
the LFE signals feeding it. This ensures that you are only measuring the contribution from the bass management system.
Analogue Operations
AWS 924-948 Owner’s Manual Page 3-19
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