Lexicon Digital Controller MC-12 - Manual (Page 99)

MC-12 Setup
3-55
INTERNAL NOISE TEST
Opens the INTERNAL NOISE message shown on the previous page,
which indicates that the internal noise test generates loud
calibration noise signals.
When the INTERNAL NOISE message opens:
• Press the arrow button to open the SPEAKER LEVEL ADJUST
menu shown on the previous page. When the SPEAKER LEVEL
ADJUST menu opens, the internal noise test automatically
begins.
• Press the button to skip the internal noise test.
During the internal noise test, the MC-12 sends calibration noise
signals to each speaker in the order shown on the SPEAKER LEVEL
ADJUST menu. The cursor automatically scrolls through output level
parameters, highlighting each parameter as the MC-12 sends the
calibration noise signal to the corresponding speaker. The
calibration noise signal is sent to each speaker for about 4 seconds.
Note:
When the internal noise test begins, the MC-12 automatically sets
volume level to +0dB. Avoid adjusting the master volume level while
the test is in progress to achieve THX reference levels (75dB).
INTERNAL NOISE TEST LEVELS CALIBRATION MANUAL SPEAKERS SETUP
To manually calibrate output levels during the internal noise test:
1. Set the SPL meter to “C” weighting and “SLOW” response.
2. Press the or arrow button to highlight the desired
output level parameter. Then, quickly press the button to
select this output level parameter. The horizontal bar graph
shown on the previous page will open on the on-screen display
and automatic scrolling will stop.
Note:
During the internal noise test, it is possible to select an output level
parameter just as the cursor is about to automatically scroll to the
next parameter, causing the MC-12 to send the calibration noise
signal to both speakers. If this occurs, reselect the desired speaker.
3. When the horizontal bar graph opens, press the or
button to select the output level that achieves a 75dB SPL
meter reading from the primary listening position.
4. Press to close the parameter. The internal noise test will
continue and automatic scrolling will resume.
5. Repeat steps 2, 3, and 4 until all desired output levels have
been set.
SPEAKERS SETUP MANUAL LEVELS CALIBRATION INTERNAL NOISE TEST