20
Multi-Channel Music & Cinema Systems
Theory and Design
Lexicon
played, any loud instrument or sound effect is reproduced from the front
speakers, not distractingly located off to the side.
Rear speakers in Music Logic and Music Surround, as in the stereo surround
film effects, are driven by a similar signal to the side speakers, but with some
additional delay and steering. Thus, in a 7 channel setup when a sound
effect is intended to come from the rear, it is reproduced primarily from the
rear speakers with deliberate additional help from the side speakers. (In
THX Cinema and Pro Logic, the rear speakers and the side speakers are
driven in parallel. In the Pro Logic effect, all four side and rear speakers are
driven in mono, and in the THX Cinema effect, there is a decorrelation
between the left and the right, but the signal being reproduced is the same
mono signal used in Pro Logic.)
In the Music Surround effect, the front left and right outputs are attenuated
by the volume and balance controls, but are otherwise unaltered by the
processor. This absence of main front steering is ideal for playing stereo
classical music, where the original stereo signals are reproduced from the
front speakers with absolutely no alterations. The Music Surround effect
really shines on this material — the center speaker adds a little stability to
the front image without being at all obvious, while the side and rear
speakers add a tremendous amount of ambience. Adjustments to the
Soundstage parameter will emphasize or de-emphasize the ambient infor-
mation extracted from the recording. For film, the lack of steering of the
main speakers is noticeable on dialog, and the Logic 7 effect gives better
results.
Music Logic expands on Music Surround by providing increased control of
the front soundstage. In addition to Center Level volume control, the Music
Logic effect adds Vocal Enhance and Front Steering parameters. Together,
these parameters allow you to fine-tune the effect to a specific recording.
The Vocal Enhance adjustment adds brightness to the vocal frequencies
while simultaneously increasing the volume of this region. This can help a
soloist project through a dense mix without altering the volume of the center
channel relative to the fronts. The Front Steering parameter is provided to
deliver a strong center image at a variety of listening positions, rather than
being limited to one centered “sweet spot”. Music Logic is ideal for both pop
and classical music.
The Party effect is provided to allow music to be played over your entire
system. A High Pass parameter allows you to remove bass from side and
rear speakers which might not be able to handle it. Center Level and
Subwoofer Level controls are also provided. This effect is primarily useful
for large audiences, or background music when entertaining.
To Next Page
Loading...
