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Elite Shackster
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In theory, bass frequencies produced by subwoofers is so low that you cannot 'localize' them. In other words if you were blindfolded in a room with a subwoofer and were told to point at where it was coming from you would not be able to. In this context there would be no advantage to having 2 subs but real world applications don't always work as theorized.

Also, having two subs in different locations means each sub will have a different response at the seating position so you may end up losing certain bass frequencies that are only occuring in the Left channel for instance simply because the 'left' sub is in a null at that spot. From experience, I've had my theater in rooms where the sub is behind the seating position and the bass still sounded like it was coming from the mains. Your mind takes it's bass 'cues' from the higher frequencies in the mains and thus ties the bass to that location. One example is at the end of Independence Day after the alien mothership has been destroyed. Debris enters from surround right and all of the bass travels with it even though it is coming from the subwoofer.

Hooking up a pro amp is as easy as any other. You will just need a cheap RCA to 1/4" adaptor.
 
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