Toe-In Of Left & Right Speakers; The Subwoofer(S); The Surround Speakers - PROCEED Audio Video Preamplifier Manual

toe-in of left & right speakers
L sur sub
L
C
R
R sur
Some toe-in of the Left and Right speakers toward the main listening area (see
above) will help minimize side wall reflections and balance the sound for people
at the extreme edges of the viewing area.
If possible, it is usually desirable to have the side walls between the front speak-
ers and the listener be acoustically absorptive to further minimize early side wall
reflections. Plush drapes, wall hangings, and various commercially-available mate-
rials can do the trick nicely . (Consult with your dealer for further ideas.)

the subwoofer(s)

The Proceed AVP normally uses a common-bass subwoofer, meaning that the low
frequency information from the controller is summed to a single channel. This
can be done without degrading the stereo effect because the human ear cannot
readily localize sounds below about 120 Hz. In addition, virtually all program ma-
terial (music and movies) is monophonic below 100 Hz. As a result, there is a
great deal of flexibility in the placement of the subwoofer(s). The primary goal is
to have bass which can deliver visceral impact without becoming boomy or dis-
torted. In order to achieve this, attention must be paid to room placement to
minimize the "room modes" (or standing waves). Corner placement often works
best, since it stimulates all possible room mods rather than only a few, providing
smoother overall response.

the surround speakers

Ideally, the rear speakers will create a diffuse, non-localizable soundfield which
envelopes the listener. Creating this effect depends in part on the loudspeakers
chosen for the job.
If dipolar surround speakers are used, they should be located high and to the
sides of the listening area, firing to the front and the rear of the room. (See dia-
gram, below.) This placement ensures that the audience will not be able to local-
ize them as sources of sound, but rather will be enveloped in a diffuse
soundfield. They should be at least two feet above ear level when seated. Ideally,
they would be placed somewhat above ear level even when standing, so that they
are unlikely to be localized as people walk around the room.
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