Proceed PAV User Manual
Page 31
31
toe-in of left & right speakers
sub
L sur
R sur
R
C
L
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. Placing the center speaker at the same
distance as the left and right is also important (note the arc in the diagram
above).
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 PAV is designed to use 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 pro-
gram material (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 pri-
mary goal is to have bass which can deliver visceral impact without becoming
boomy or distorted. In order to achieve this, attention must be paid to room
placement to minimize the “room modes” (or standing waves).
A good rule of thumb is to place your subwoofer(s) asymmetrically in the room,
at “odd fractions” (
1
⁄
3
,
1
⁄
5
,
2
⁄
5
, etc.) of the room’s length or width.
sub
L sur
R sur
R
C
L
1
⁄
3
You may also want to try to keep your subwoofer(s) within three feet (one
meter) of the circle formed by anchoring a string at the main listening position
and swinging the other end through the front speakers. (Doing so minimizes and