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A
TECHNOLOGY
tlantic
Models 222 PBM, 262 PBM and 352 PBM THX
14
Operation
First, with your receiver/amplifier’s power off, set the subwoofer’s volume by turning
the variable input level control on the front of the unit to the 8:00 o’clock position,
and the low pass control on the back panel set to 80. Next, turn on your system and
play some music. Adjust the input level and low pass filter until the bass seems
smoothly integrated between the subwoofer(s) and the main speakers without being
overpowering.
The Phase Invert Mode
A subwoofer operating out of phase with the rest of the system will not provide
optimum low frequency performance. Also, the correct subwoofer phase can enhance
room acoustics. Since there is so much 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 subwoofer amplifier’s rear panel. Listen to a monoraul
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.) Experiment with the position of the phase switch to
get the most extended bass. It should be obvious which is the correct setting.
A Word About Center Channel Modes
Many 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
“wide” mode will extend the bass response of the center channel speaker and this,
combined with the bass output of the subwoofer, will result in an unnatural heaviness
or boominess to the bass output of the system. The center channel speaker will also
sound more dynamic and the intelligibility of the system will generally be improved
when operated in the “normal” mode.
