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 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.
1⁄3
L
C
R
R sur
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
