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Model T70 PBM
Figure 2:
Typical arrange-
ment for a single
subwoofer in a
home theater.
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Less Bass
More Bass
Placement and Operation
Generally speaking, the best location for your new Subwoofer will be in the front of the room, in or
close to a corner (Figure 2). Every room has its own unique sound characteristics, and flexibility in the
exact placement of the subwoofer is always desirable. The closer the subwoofer is placed to a wall and
especially a corner, the more and deeper the bass response you will hear. However, in some rooms,
corner placement can produce too much bass or a “one note” boomy effect. Under such circumstances
the subwoofer may work better away from the wall or corner. You should experiment to find the best
position in your room.
Helpful Hint:
A particularly useful experiment is to place the subwoofer right at the prime listening position
(move that couch or chair out of the way and put the sub in its place). Then play something with lots of good
bass (preferably music), and walk around the room, listening to the subwoofer’s response. When you locate an
area that has ample amounts of well defined bass you have found a good potential place to locate the sub.
Dual Subwoofer Placement
When two subwoofers are used you may wish to place them asymmetrically; that is, in slightly
different positions in the room (Figure 3). This will reduce common mode room resonances that
typically occur with symmetrically placed subwoofers. Another good option is to place the subwoofers
in the same corner. Several tests have shown this to be a viable means of producing smooth bass
response in many rooms.
Subwoofer Tuning Using the Variable Level Control
Assuming that you do not have access to a Sound Pressure Level meter for system set up, start your
listening with the subwoofer crossover control set at approximately two-thirds of its range (which
corresponds to approximately 100Hz), the phase switch set to normal, and the variable level control
set to the bottom of its range (fully counterclockwise facing the back of the woofer). Play some music
