Owner's Manual

SETUP
Lexicon
3-38
Internal Noise Test (continued)
Note:
The MC-4 automatically sets volume level to +0dB
when the internal noise test begins. Avoid adjusting
master volume level while the test is in progress to
achieve a 75dB THX-reference level (a 75dB SPL
meter reading).
When the internal noise test is conducted, a calibration test signal
travels to the audio output connectors in the order listed on the
SPEAKER LEVEL ADJUST menu. As the calibration test signal travels,
the cursor automatically scrolls downward through SPEAKER
LEVEL ADJUST menu parameters, highlighting each speaker
parameter as the corresponding output connector is tested. Each
output connector is tested for about 4 seconds.
The SPEAKER LEVEL ADJUST menu can be used to manually adjust
output levels while the internal noise test is conducted. See
“SPEAKER LEVEL ADJUST” on page 3-40 for more information.
To manually adjust output levels while the internal noise test
is conducted:
1. Set the SPL meter to “C” weighting and “SLOW” response.
2. Press the Menu  and  arrows to highlight the desired
SPEAKER LEVEL ADJUST parameter.
3. When the desired parameter is highlighted, quickly press the
Menu  arrow to select this parameter. A horizontal bar
graph will open on the on-screen display.
4. When the horizontal bar graph opens, Press the Menu 
and  arrows to adjust the selected parameter. All output
levels should be adjusted to achieve a 75dB SPL meter reading
from the primary listening position.
5. When the desired adjustments have been made, press the
Menu  arrow to close the horizontal bar graph and return
to the SPEAKER LEVEL ADJUST menu. The internal noise test
will continue and automatic scrolling will resume.
Please note the following:
• When the internal noise test is conducted, it is possible to
select a SPEAKER LEVEL ADJUST menu parameter just as the
MC-4 is about to automatically scroll to the next parameter,
causing the MC-4 to send the calibration noise to both
loudspeakers. If this occurs, press the Menu  and  arrows
reselect the desired loudspeaker.
Note:
Audio output connectors for which the corresponding
CUSTOM or THX SETUP menu parameter is set to
NONE cannot be adjusted during the internal noise
test. These output connectors can be adjusted during
the external noise test, but there is no need to do so.