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Message: <blockquote data-quote="mixtape_kid" data-source="post: 1337249" data-attributes="member: 563150">ok i have 2 dual 4 ohm voice coil 10 inch ma audio a 1000 watt pheonix digital amp and piooner head unit and jenson wiring kit for a 250 watt amp.now the problem i drive a 93 astro van and i get this nasting thumping sound from subs like some one knocking on my rear window.my first thought was the rca cables but i have been therw 3 pair of them so next is the ground i have tried this same setup with my 250 jenson ampits the old schooll whith the hand print on it with the green light..if the ground is not the problem i think its my head unit.i have the system ground under my 2 row seat.what is my problem</blockquote>

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