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Atlantic Technology
®
Figure 3:
Typical arrange-
ment for a single
subwoofer in a
home theater.
Start here
Less Bass
More Bass
wall and especially a corner, the more
bass response you will hear. However, in
many rooms, corner placement can
produce too much bass or a “one note”
effect and the subwoofer may work better
well away from the corner.
Experiment to find the best position in
your room. Refer back to the wiring
diagrams starting on page 6 to determine
the correct wiring scheme for your
particular setup. Then proceed with
listening and fine tuning.
Subwoofer Tuning Using the Variable Level Control
Start your listening with the high-pass filter set at approximately the center of its range (which
corresponds to 80Hz), the phase switch set to normal, and the front panel variable level control
(Figure 4) set to the bottom of its range (fully counterclockwise facing the front of the woofer). Play
some music that you know has good bass content, and turn the level control up until you just start to
hear the subwoofer working. Now, from your normal listening position, determine whether the
subwoofer is playing loudly enough and filling in the bass frequencies of the music evenly. If
adjustment is necessary, start by changing the setting of the front panel level control to compensate.
If the bass seems too heavy, move the subwoofer away from the corner. If the
bass seems too thin, move the subwoofer closer to the corner. Small
differences in positioning the subwoofer can make big differences in the
overall bass response. When you find a position that seems to work well, try
switching the phase switch between its two settings, listening closely for the
smoothest transition from the subwoofer to the satellites. In many cases
people prefer more bass impact for movies than sounds natural when reproducing music. You may
wish to determine both a video level and an audio level if you find yourself falling into this camp.
Remember however, the most common error most people make is to play the subwoofer too loudly. Of
course, the Bass Police will not arrest you for this act. But should you wish for the most accurate
overall reproduction, a well balanced sound from bass to highest treble is the best way to get it. Have
fun. Experiment. Try it. You might like it.
When two subwoofers are used, whether
for regular Dolby Pro Logic, Dolby Digital,
DTS, or pure music reproduction they
should be placed asymmetrically; that is,
in slightly different positions on each side
of the television (Figure 5). This will help
to attenuate room resonances that are
common to symmetrically positioned
subwoofers. You can also try placing the
subwoofers in the same corner, if you
wish, Experiments have shown this to be
a viable means of producing smooth bass
response in many rooms.
Figure 4:
Front Panel
Variable Level
Control located
behind the
removable grille.
Figure 5:
Assymmetrical
arrangement for
2 subwoofers in
a home theater,
for example, one
closer to a corner
than the other.
