Lexicon DC-1 owner manual Logic 7 THX and Dolby Digital versions, Logic 7 Parameters

DC-1 Effects

Lexicon

Logic 7 (THX and Dolby Digital versions)

Available only in the THX and Dolby Digital versions of the DC-1, this film sound mode reproduces musical material with maximum separation at all times, whether or not directional material is being steered. In addition, Logic 7 uses intelligent steering to extract wide bandwidth stereo surround channels. If both side and rear speaker pairs are available, signals may be steered between the left side and left rear, or between the right side and right rear. It is also possible for a signal to be steered fully to the rear speakers, with the side surround speakers 6dB lower than the rears to provide subjective rear imaging.

Logic 7 contains the re-equalizer feature of the THX Cinema effect, as well as Lexicon's proprietary dialog enhancement feature. The combination of stereo surround information during music and decorrelated effects, with discrete steering to the sides and rears, gives Logic 7 unrivaled performance on surround encoded films.

Logic 7 Parameters	Parameter	Initial Value	Range
	AUTO AZIMUTH	ON	ON/OFF
	DIALOG ENHANCE	0.0dB	0.0dB, +3.0dB, +6.0dB
	REAR ROLLOFF	8.2kHz	453Hz-20.0kHz
	REAR DELAY OFFSET	5ms	0-20ms
	RE-EQUALIZER	ON	ON/OFF
	SIDE ASSIGN	SIDE	Front/Side, Front/Rear*
	SURROUND LEVEL	+0dB	-5 to +5dB
	SUBWOOFER LVL	+0dB	-5 to +5dB
	EFFECT LEVEL	+00dB	-30 to +05dB
	CUSTOM
	* Dependent on speaker configuration

AUTO AZIMUTH is short for auto azimuth error correction/automatic input balance. Auto Azimuth should be set to ON for films, and OFF for music. When ON, special patented algorithms continually monitor the input signal and adjust both the relative level and time offset of the two channels to keep the dialog properly centered and special effects properly localized. This automatic feature is the reason the unit does not need an input balance control for Dolby Surround decoding.

DIALOG ENHANCE boosts dialog in the center channel. By targeting specific frequencies, it boosts only dialog, without raising the entire center channel level (which would alter the output balance achieved during calibration).

REAR ROLLOFF sets the cutoff frequency of a low pass filter in the rear- channel. Frequencies above this setting are attenuated. This control should be set high enough to give presence and airiness to the rear sound without placing distracting instrumental overtones or other sounds behind you. In systems configured without rear speakers, the settings affect the side out- puts.

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