Atlantic Technology 452 PBM THX Instrukcja obsługi - Strona 10

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Model 452 PBM THX

Subwoofer Tuning—Using the Variable Level Control

Start your listening with the high-pass filter set at 80Hz, the phase switch set to normal, and the

front panel variable level control (Figure 5) set to minimum, just above the Fixed THX clickstop

position. Play some music that you know has good bass content, and turn the level control up until

Figure 5:

Front Panel

Variable Level

Control located

behind the

removable grille

find a position that seems to work well, try switching the phase switch between its two settings,

listening closely for the smoothest bass response. Remember, the most common error is to play

the subwoofer too loudly.

When two subwoofers are used, whether for Home THX operation, regular Dolby Pro Logic, Dolby

Digital AC-3, or DTS, they should be placed asymmetrically; that is, in slightly different positions on

each side of the television (Figure 6). This will help to attenuate room resonances that are common to

symmetrically positioned subwoofers.

Figure 6:

Assymmetrical

arrangement for

2 subwoofers in

a home theater,

for example, one

closer to a corner

than the other

you just start to hear the subwoofer working. Now, from your

normal listening position, determine whether the subwoofer is

playing loud enough and filling in the bass frequencies of the

music evenly. If it needs adjustment, change the setting of the

front panel level control to compensate.

If the bass seems too heavy, move the subwoofer away from the

corner. If the bass seems too thin, move the subwoofer closer to

the corner. Small differences in positioning the subwoofer can

make big differences in the overall bass response. When you

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