Using the Subwoofer Low Pass Control
When used with the complete Atlantic Audio System 4400,
the subwoofer's low-pass control should be set at around 80Hz
(unless you are using a processor with its own built-in cross-
over). The low-frequency response of the System 4400 satel-
lites has been optimized to work with approximately an 80Hz
crossover point. Higher crossover frequencies pass more bass
but can sound boomy and may be more easily localized to the
subwoofer.
A higher crossover frequency setting than 80Hz may be suitable,
however, when using very small satellites that have no real low
frequency performance. Settings lower than 80Hz should be em-
ployed if you are using larger main speakers with extended bass
response. The subwoofer should only produce the very lowest
bass that is below range of the main speakers.
Consult the manufacturer’s specified low frequency response for
your main speakers to determine an approximate low pass set-
ting on your subwoofer.
The Phase Invert Control
A switch that reverses the phase of the subwoofer is provided on
the amplifier panel. Listen to a monaural musical source with
strong, consistent bass content while someone else flips this
switch. The switch only affects the narrow range of bass output
that is shared between the "upper end" of the subwoofer's output
and the "lower end" of the main speaker's output. Leave the
switch in the position that has stronger output. Then fine tune
the subwoofer's low pass and volume adjustment.
It is possible you will not hear a difference between the two
settings of this switch. If you do not hear a difference, it
indicates your main speakers and subwoofer are not precisely
"in-phase" or "out-of-phase" at the narrow range of bass cov-
ered by both speakers.
If so, just use the low pass and volume adjustments to set the
subwoofer balance.
A Word About Bass, Center Channel Modes and System Set Up
Many surround processors and receivers feature a “Wide” and
“Normal” mode for the center channel speaker. Atlantic Tech-
nology 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, 6.1, or 7.1” channel systems (Dolby
Digital, DTS, etc.), many controllers provide a Bass Management
option, which lets you set the front and rear speakers in a lim-
ited bandwidth (Small) or full range (Large) mode. When using
a subwoofer with Atlantic Technology speakers we recommend
setting such a controller to the Small position for all the speakers
in the system.
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SBT-1000 & SBT-500 Powered Subwoofers
IMPORTANT: Save The Carton Assembly!
Save all packing materials until you are certain 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.
If at all possible, save the carton assembly. There is no
substitute should you need to move or ship your sub-
woofer for any reason.
Care of Your Subwoofer
Atlantic Technology subwoofers are constructed from thick Me-
dium Density Fiberboard. MDF is a non-resonant material ideal
for speaker system enclosures. 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 source of heat that may, over time, damage the finish.
