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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
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 rear mounted level control to compensate.
If the bass seems too heavy, move the subwoofer away from the wall/corner. If the bass seems too thin,
move the subwoofer closer to the wall/corner. Small differences in positioning can make big
differences in bass response. When you find a position that seems to work well, have someone switch
the phase switch between its two settings, while you’re in the prime listening position. Pay particular
attention to the transition from the subwoofer to the satellites.
Sometimes 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 people make when setting up their system is to
play the subwoofer (and surround speakers) too loudly. Of course, the Bass Police will not arrest you
for this act. But should you desire the most accurate overall reproduction, a well balanced sound from
deepest bass to highest treble is the best way to get it.
Using the Crossover Control
When used with the complete T70.1 system, the T70.1 PBM crossover control should be set at two-
thirds of its range as stated above. The goal is to optimize the performance of the system by ensuring
that the subwoofer and satellites produce a cohesive and well integrated sound “picture.” The low
frequency response of the T70.1 satellites has been optimized to work with approximately a 100Hz
crossover point. This provides maximum performance and the smoothest integration with the
subwoofer.
Figure 3:
Assymmetrical
arrangement for
2 subwoofers in
a home theater,
for example, one
closer to a corner
than the other.