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Model 452 PBM THX
Atlantic Technology
®
Subwoofer Tuning—Using the Variable Level Control
Start your listening with the high-pass filter set at 80Hz, the phase switch set to normal, and the
front panel variable level control (Figure 5) set to minimum, just above the Fixed THX clickstop
position. 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 loud enough and filling in the bass frequencies of the
music evenly. If it needs adjustment, change 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 bass response. Remember, the most common error is to play
the subwoofer too loudly.
When two subwoofers are used, whether for Home THX operation, regular Dolby Pro Logic, Dolby
Digital AC-3, or DTS, they should be placed asymmetrically; that is, in slightly different positions on
each side of the television (Figure 6). This will help to attenuate room resonances that are common to
symmetrically positioned subwoofers.
Figure 6:
Assymmetrical
arrangement for
2 subwoofers in
a home theater,
for example, one
closer to a corner
than the other
Figure 5:
Front Panel
Variable Level
Control located
behind the
removable grille
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