Lexicon owner manual Using CP-3

Using

the CP-3

CP-3 Digital Surround Processor

music. When it is 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 why the CP-3 does not have or need an input balance control for Dolby Surround decoding.

BASS SPLIT takes the low bass from the center, where it is in many film and music mixes, and distributes it instead to the left and right front-channel speakers. Bass Splitting is valuable because in many video installations the center speaker is smaller than the two main stereo speakers and less capable of handling the lowest frequencies. By directing the low frequencies to the main speakers, there is less risk of damage to a small center speaker and no loss of bass information since it will be reproduced by the main speakers.

SUB BASS BOOST boosts or cuts the subwoofer output level. Although the normal subwoofer level was set during the initial calibration procedure, with some recordings you may find it desireable to increase or decrease this deep bass level.

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, but not so high as to place distracting instrumental overtones or other sounds behind you. The appropriate setting will vary with program material.

REAR DOLBY B Dolby Surround decoding specifications call for a special form of Dolby B-type noise reduction for the rear (surround) channel. Since Dolby Surround encoded material should generally be listened to in the ProLogic or THX modes, this parameter is normally OFF. It can, however, be turned ON if you wish to experiment with this.

The RE-EQUALIZER equalizes the left, center and right channel outputs to match the overall frequency balance of the original recording. Without this re-equalization, many films, and some television programs, will sound too bright.

DECORRELATE electronically "scrambles" the monaural surround chan- nel to provide added spaciousness and envelopment.

SIDE SPEAKER ASSIGN determines whether the information fed to the side outputs is derived from the front left and right, or from the rear. Choosing the front setting will create a very wide soundstage, which can be very exciting on some soundtracks. On others, particularly those with panned dialog and very tight localization of sound effects, the soundstage will be too wide. Technically, the rear setting is a closer match to the original recording format.

In Television, MAIN MUTE mutes only the center output; EFFECTS MUTE mutes the center, side and rear outputs.

Bass Split

Bass Split rolls off frequencies at 6dB per octave. The values given are at the -3dB point of attenuation from the center speaker.

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