One hole for both speakers and it sould be the light green colored hole. If you are playing out of windows media player you can boost the Bass by enabling the equalizer. All of the others should have EQ adjustments as well.
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EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.