Lexicon DC-1 owner manual Dolby Digital version, Subwoofer Peak Limiter

Installation and

Calibration

Lexicon

	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.
Subwoofer Peak Limiter	Dolby AC-3 encoded soundtracks can produce low frequency peaks that
(Dolby Digital version)	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.

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.

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