AMPLIFIER MODEL:ALPINE PDX-4.150(RMS 600 WATTS)
SUBWOOFER:ALPINE SWS-1043D(RMS 300 WATTS)
SUBWOOFER IS GIVEN FULL RMS 300 WATTS.
WHEN VOLUME IS INCREASED TO MORE THAN 23 (MAX35,SONY EXPLODE CAR STEREO) THE SUBWOOFER STOPS.
GAIN & OTHER ADJUSTMENTS ARE ALREADY TESTED.
KINDLY ADVISE.

BIKRAMJIT SINGH, May 2008

hi you will be overloading your sub try turning down on the amp if that doesnt work you may need to buy something called a power cap or a farrad. it is a power back up which you put in the middle of you 12+ cable to reserve power and it might make your sub work at higher volumes

simon hall, September 2008