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SW-12 (120V) OM  

1/15/04 4:20 PM Page 7  

OPERATION  

Power On  

Plug your subwoofer’s AC cord into a wall outlet.Do not use the  

outlets on the back of the receiver.  

Crossover Adjustments  

NOTE: This control will have no effect if the Normal/LFE Selector  

Switch §is set to“LFE.”If you have a Dolby Digital or DTS  

processor/receiver, the Crossover Frequency is set by the  

processor/receiver. Consult your owner’s manual to learn how  

to view or change this setting.  

Initially set the Subwoofer Level (Volume) Control ªto the  

“

min”position.  

Turn on your sub by pressing the Power Switch ‹on the  

rear panel.  

Auto On/Standby  

The Crossover Adjustment Control •determines the highest  

frequency at which the subwoofer reproduces sounds. If your main  

speakers can comfortably reproduce some low-frequency sounds,  

set this control to a lower frequency setting, between 50Hz  

and 100Hz.This will concentrate the subwoofer’s efforts on the  

ultradeep bass sounds required by today’s films and music. If you  

are using smaller bookshelf speakers that do not extend to the  

lower bass frequencies, set the Crossover Adjustment Control to  

a higher setting, between 120Hz and 150Hz.  

With the Power Switch ‹in the ON position, the Power  

Indicator LED ¶will remain backlit in red or green to  

indicate the On/Standby mode of the subwoofer.  

RED = STANDBY (No signal detected,Amp Off)  

GREEN = ON (Signal detected,Amp On)  

The subwoofer will automatically enter the Standby mode after  

approximately 10 minutes when no signal is detected from your  

system.The subwoofer will then power ON instantly when a  

signal is detected. During periods of normal use, the Power  

Switch ‹can be left on.You may turn off the Power Switch ‹  

for extended periods of nonoperation, e.g., when you are away  

on vacation.  

Phase Control  

The Phase Switch ∞determines whether the subwoofer  

speaker’s piston-like action moves in and out with the main  

speakers, 0,˚ or opposite the main speakers, 180˚. Proper phase  

adjustment depends on several variables such as room size,  

subwoofer placement and listener position.Adjust the phase  

switch to maximize bass output at the listening position.  

Adjust Gain  

Turn on your entire audio system and start a CD or movie  

soundtrack at a moderate level.Turn up the Subwoofer Level  

(

Volume) Control ªabout half way. If no sound emanates from  

the subwoofer, check the AC-line cord and input cables. Are the  

connectors on the cables making proper contact? Is the AC  

plug connected to a“live”receptacle? Has the Power Switch ‹  

been pressed to the“On”position? Once you have confirmed that  

the subwoofer is active, proceed by playing a CD, record or  

cassette. Use a selection that has ample bass information.  

Set the overall volume control of the preamplifier or stereo to a  

comfortable level. Adjust the Subwoofer Level (Volume) Control ª  

until you obtain a pleasing blend of bass. Bass response should  

not overpower the room but rather be adjusted so there is a  

harmonious blend across the entire musical range. Many users  

have a tendency to set the subwoofer volume too loud,  

adhering to the belief that a subwoofer is there to produce lots  

of bass.This is not entirely true.A subwoofer is there to enhance  

bass, extending the response of the entire system so the bass  

can be felt as well as heard. However, overall balance must  

be maintained or the music will not sound natural. An  

experienced listener will set the volume of the subwoofer so  

its impact on bass response is always there but never obtrusive.  

SW-12  

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