The boom boom noise is the subwoofer, the only sound that should be coming out of it is very low and room shaking sound, nothing high so you can't really hear it, just feel it. As long as there is bass and not just high pitched noises coming out the speakers, they are fine.
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My PC:
Mobo: EVGA nForce 680i SLI
CPU: Core 2 Duo e6300 @ 2.7GHz
RAM: 3GB OCZ XTC DDR2 @ 800MHz
Hard Drive: Western Digital 250GB and 640GB
Video Card: EVGA 8800GTS 640MB x2 SLI
PSU: Antec TruePower Trio 650
Case:
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