30
Lexicon
Installation and
Calibration
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.
Dolby AC-3 encoded soundtracks can produce low frequency peaks that
are 15dB higher than those in matrixed Dolby Surround decoding. These
higher levels may be troublesome in the home listening environment, either
because they disturb non-listeners in nearby rooms, or because of the
inability of the subwoofer and its associated amplifier to reproduce these
levels without clipping.
Subwoofer Peak Limiter
(Dolby Digital version)
The Dolby Digital version of the DC-1 provides a Subwoofer Peak Limiter
that prevents the subwoofer signal level from exceeding a preset value. The
limiter is factory preset to a level of +25dB. This setting can be changed
within the limiter’s operating range of -5dB to +35dB, with -5dB providing
maximum limiting.
To turn off the limiter or to change its setting, select the SUB PK LIMITER
parameter in the Output Levels menu.
If you want to turn the limiter off, first turn the system volume down in order
to prevent the subwoofer from overloading.
Press MENU ▼ to select LIMITER, then press SELECT. Press MENU ▼ to
select OFF. Press DONE twice to return to the Output Levels menu. While
readjusting the system volume back to a comfortable listening level, check
to be sure the subwoofer or its amplifier is not overloading on passages with
low frequency effects.