Atlantic Technology 452 PBM THX Instruction Manual - Page 11

Browse online or download pdf Instruction Manual for Subwoofer Atlantic Technology 452 PBM THX. Atlantic Technology 452 PBM THX 13 pages. Reference thx powered subwoofer system

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Model 452 PBM THX

THX Settings

When using the 452 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

No bass output

Audible buzz

or hum

More than one

source audible

Weak bass

Weak bass: vague stereo image

Possible Cause

AC power cord unplugged or plugged into a non-working outlet.

Input cables not securely connected or defective.

Input cable not securely connected or defective.

Single HI LEVEL input connected to the RIGHT channel only.

Ground loop through antenna or cable TV system input.

More than one source is playing.

Subwoofer too far from the wall.

VARIABLE INPUT LEVEL set too low.

Input source connected to HI LEVEL inputs is wired out of phase.

Possible Solution

Plug into a working outlet.

Check all connections, then try another input cable.

Connect to the LEFT input channel.

Test by disconnecting antenna and/or cable system input leads.

If hum goes away, install isolation balun(s) at that point.

All the subwoofer's inputs are active at all times. Turn off

unwanted source.

Move the subwoofer closer to a wall or corner.

Turn control up somewhat.

Check speaker wire connections and reconnect in proper phase.

Atlantic Technology