Lexicon
26
System
Configuration
Select INTERNAL NOISE TEST or EXTERNAL NOISE TEST from the
Output Levels menu. The INTERNAL NOISE TEST disables any EQ
functions, centers the Balance and Fader controls, and sets the system
volume to +00dB. The test signal circles the room according to the
speaker configuration you have defined in the Speaker Configuration
menu. For a full complement of speakers, the order is: Left Front,
Center, Right Front, Right Side, Left Side, Subwoofer, Right Rear, Left
Rear.
The EXTERNAL NOISE TEST loads the Pro Logic, Dolby Digital or DTS
Music effect and uses the signal from the currently selected input for
calibration.
Once a test source is selected, a sub-menu showing each output level
is displayed. Use the ▲ and ▼ buttons to highlight an output for
adjustment. Press SELECT to stop the cycling of the noise signal, then
use ▲ and ▼ to adjust the selected output level in precise 0.5dB
increments from -10dB to +10dB.
NOTE: If any of the amplifiers in your
system have output level controls, their
settings will affect the balance of the
MC-1 outputs. Generally, the gain con-
trols of these amps should be set prior to
MC-1 Output Level calibration. You
should record the values of these con-
trols for later reference.
Using a Sound Pressure Level Meter such as Radio Shack model
33-2050 or 33-2055, set the weighting to

C

and the response to

Slow

.
Adjust all output levels to achieve 75dB at the listening position.
In the absence of an SPL meter, it is possible to set the output level by
ear. Use the internal noise generator in the MC-1 to adjust all volumes
to be the same as they cycle around the various speakers. Depending
on timbre variations between your speakers, this may be difficult to
judge — get as close as you can. The system should be reasonably well
balanced, although not actually calibrated for precise playback and
level matching. With the system volume at 0dB, the internal noise
source should be at the same level at which film dialog sounds
comfortable.
Note on External Noise Calibration
When using the external noise calibration, the MC-1 will load the factory
default effect for the format of the incoming signal. In other words, if a
PCM signal is coming into the MC-1 when external noise is engaged, the
MC-1 will load the PRO LOGIC effect with the factory preset settings. If
INTERNAL NOISE TEST
EXTERNAL NOISE TEST
LEFT FRONT
CENTER*
RIGHT FRONT
RIGHT SIDE*
RIGHT REAR*
LEFT REAR*
LEFT SIDE*
SUBWOOFER*
▲▼
Adjust with or
OUTPUT LEVELS MENU
-10dB to +10dB
*These selections will not be active
if "NONE" is selected in the Speaker
Configuration menu.