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Atlantic Technology
®
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 both the deep bass
and
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
bass to highest treble is the best way to get it.
Using the Crossover Control
When used with the complete T70 system, the T70 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 satellites has been optimized to work with approximately a 100Hz crossover point.
This provides maximum performance and the smoothest integration with the subwoofer.
Higher crossover frequencies pass more bass but can sound boomy and may be more easily localized to
the subwoofer. Higher crossover frequencies may be suitable, however, when using very small satellites
that have no real low frequency performance. Settings lower than 90Hz should be employed if you are
using full range speakers that have extended bass response. This way, the subwoofer will only
reproduce the very lowest bass frequencies that are in the range where the large main speakers begin to
roll off. It’s generally undesirable to have the main speakers and the subwoofer overlap too much.
Larger speakers generally require a lower crossover frequency, smaller speakers generally a higher
Figure 3:
Assymmetrical
arrangement for
2 subwoofers in
a home theater,
for example, one
closer to a corner
than the other.
