Lexicon Digital Controller DC-1 - Manual (Page 47)

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DC-1 Digital Controller
DC-1Effects
Music Surround
(THX and Dolby
Digital versions) Music Surround, available in the THX and Dolby Digital versions of the
DC-1, is a surround effect developed specifically for music listening. It
makes full use of additional loudspeakers placed at the center, sides and
rear of the room. This effect passes unprocessed left and right information
directly to the front left and right speakers.
Music Surround Parameters
CENTER LEVEL attenuates the level of the center channel and can turn it
off completely.
SURROUND LEVEL controls the volume level of the side and rear speakers.
Although we have selected a default value, the correct setting will vary with
each recording, the room, and your personal taste.
SIDE ROLLOFF provides a high frequency cutoff for the side speakers. The
optimal setting for this control will vary widely with the source material.
REAR DELAY OFFSET is an additional delay added to the rear channels.
This delay increases the apparent size of the listening space by increasing
the rear delay time. Feel free to experiment to find the setting that works
best.
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.
SUBWOOFER LVL boosts or cuts the subwoofer output level. Although the
normal subwoofer level is set during the calibration procedure, with some
recordings it may be desirable to increase or decrease this deep bass level.
EFFECT LEVEL adjusts the loudness of the side and rear speakers. When
there are no side speakers, it adjusts the amount of ambient signal mixed
into the main loudspeakers.
Parameter Initial Value Range
CENTER LEVEL 15 0-30
SURROUND LEVEL +0dB -5 to +5dB
SIDE ROLLOFF 4.0kHz 453Hz20.0kHz
REAR DELAY OFFSET 5ms 0-20ms
REAR ROLLOFF 4.0kHz 453Hz20.0kHz
SUBWOOFER LVL +0dB -5 to +5dB
EFFECT LEVEL +00dB -30 to +05dB
CUSTOM