Setting Output Levels - Lexicon DC-1 - REV 1 Owner's Manual

Installation and
Calibration

Setting Output Levels

NOTE: If any of the amplifiers in
your system have gain (volume)
controls, their level settings will af-
fect the balance of the DC-1 out-
puts. Generally, the gain controls
of these amps should be set at or
near maximum. You should record
the values of these controls for
later reference.
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When DC-1 input and output levels are set properly, the entire system will
be calibrated to play films at the level intended by the director. Setting the
output levels is easy, particularly if a Sound Pressure Level (SPL) meter is
used. Using an external source, such as the THX "WOW!" disc or "The
Surround Spectacular" disc from Delos (DE-3179), or the DC-1's internally
generated calibration signal, adjust the level of each output to the same
relative level.
Select INTERNAL NOISE TEST or EXTERNAL NOISE TEST from the
Output Levels menu. The INTERNAL NOISE TEST automatically discon-
nects all audio and video inputs, disables any EQ functions, centers the
Balance controls, loads the Pro Logic effect, and sets the system volume to
0dB. The test signal circles the room according to the speaker configuration
you have defined in the Speaker Configuration menu. For a full comple-
ment 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 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 MENU
adjustment. Press SELECT to stop the cycling of the noise signal, then use
MENU to adjust the selected output level in precise 0.5dB
and
increments from -10dB to +10dB.
Using a Sound Pressure Level Meter such as Radio Shack 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.
buttons to highlight an output for
and
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