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Model T70.1 PBM
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
crossover frequency. Consult the manufacturer’s specified low frequency response for your main
speakers to determine the appropriate setting on the subwoofer. In the end, however, a little time
spent experimenting will generally result in dramatically better bass response.
The Phase Invert Control
A subwoofer operating out of phase with the rest of the system won’t provide optimum low frequency
performance. Also, the correct subwoofer phase can enhance room acoustics. Since there is some
variation in the industry regarding phase, and no standards have been established, a switch that will
reverse the phase of the subwoofer is provided on the amplifier panel. Listen to a monaural musical
source with strong bass content. (For example, you can use the mono switch on an FM tuner or
preamp, or use a Y-connector on the outputs of one of your source components to get a mono signal.)
Have someone experiment with the position of the phase switch to get the most extended bass while
you’re sitting in the prime listening position. It should be obvious which is the correct setting. In
particular, there will be a smoother more integrated transition between the satellites and the
subwoofer when they are properly phased.
A Word About Bass, Center Channel Modes, and System Set Up
Many Dolby Pro Logic surround processors and surround receivers feature a “Wide” and “Normal” mode
for the center channel speaker. Atlantic Technology recommends that the center channel be operated in
the Normal mode when using a powered subwoofer. The center channel speaker will sound more dynamic
and the intelligibility of the system will generally be improved when in the Normal mode.
With discrete digital “5.1” channel systems (Dolby Digital AC-3, etc.) many controllers provide a Bass
Management option, which lets you set the front and rear speakers in a limited bandwidth (Small) or
full range (Large) mode. All Atlantic Technology speakers are designed to be used in the Small setting
with such a controller. However, when using high level connections, the Large setting should be used.
Care and Feeding of Your Subwoofer
The T70.1 PBM is constructed from 3/4" Medium Density Fiberboard. MDF is a non-resonant material
ideal for speaker system enclosures. The outside of the woofer is layered with a high quality Black Ash
finished vinyl laminate. To clean the cabinet you may use a soft cloth either dry or slightly dampened
with clean water. Be careful not to wet the cabinet or allow any water to enter the cabinet seams.
Avoid placing your speakers in direct sunlight or near a heat source that may, over time, damage the finish.
Important: Save Your Boxes! If you can do so, save the carton, packing pieces and plastic bags that came
with your subwoofer. They will be useful in case you move or have to ship your subwoofer for any reason. In
any case, save all packing materials until you are certain that the system has suffered no damage in
shipment. If you find such damage, either visible or internal, contact your dealer immediately for the proper
return procedure.