Lexicon
26
System
Configuration
Note on External Noise
Calibration
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 con-
trols, their settings will affect the
balance of the DC-1 outputs. Gen-
erally, the gain controls of these
amps should be set prior to DC-1
Output Level calibration. You
should record the values of these
controls 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 DC-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.
When using the external noise calibration, the DC-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 DC-1 when external noise is engaged, the DC-1 will
load the PRO LOGIC effect with the factory preset settings. If a Dolby
Digital AC-3 signal is coming in, the DC-1 will load the DOLBY DIGITAL
effect with the factory preset settings. If a DTS signal is coming in, the
DC-1 will load the DTS MUSIC effect with the factory preset settings.
NOTE: The Volume control is active when utilizing external noise.
