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Model 372 PBM THX
Atlantic Technology
®
THX Settings
When using the 372 PBM THX in a system employing THX electronics, both the lo-pass filter on the
rear panel and the variable level control on the front panel should be set in the THX position for
proper operation. Rotate the variable level control fully counterclockwise until it clicks into the Fixed
THX position. This is the preset THX level, but you may increase the setting of this control to
compensate for room acoustics. The THX sound quality will not be compromised.
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 center channel speaker will sound more
dynamic and the intelligibility of the system will generally be improved when in the “normal” mode.
Subwoofer Troubleshooting Guide
Once your subwoofer is set up, you should have many years of maintenance free enjoyment from your
system. However, if you should encounter a problem, refer to the following guide to help you find the
solution. If a problem persists, you should contact your local authorized Atlantic Technology dealer.
Problem
Possible Cause
Possible Solution
No bass output
AC power cord unplugged or plugged into a non-working outlet.
Plug into a working outlet.
Input cables not securely connected or defective.
Check all connections, then try another input cable.
Audible buzz
Input cable not securely connected or defective.
Check all connections, then try another input cable.
or hum
Single HI LEVEL input connected to the RIGHT channel only.
Connect to the LEFT input channel.
Ground loop through antenna or cable TV system input.
Test by disconnecting antenna and/or cable system input leads.
If hum goes away, install isolation balun(s) at that point.
More than one
More than one source is playing.
All the subwoofer’s inputs are active at all times. Turn off
source audible
unwanted source.
Weak bass
Subwoofer too far from the wall.
Move the subwoofer closer to a wall or corner.
VARIABLE INPUT LEVEL set too low.
Turn control up somewhat.
Weak bass: vague stereo image
Input source connected to HI LEVEL inputs is wired out of phase.
Check speaker wire connections and reconnect in proper phase.
