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<blockquote data-quote="TrickeffeX" data-source="post: 866753" data-attributes="member: 555688">i have a 98 mustang gt w/out the mach stereo.i have a premier 860mp and 4 pioneer 3way 6x8&#039;s powered by a profile ca 640 4 channel amp.i just installed the 4 6x8&#039;s this morning.after i got through i cranked the car and 1st thing i heard was horrible ground noise.i re did my amp ground and even bout new rca&#039;s and its still there.i drove down the road and the ground noise would come on and off and on and off before it just stayed on.what could be causiing this?could it be somthing to do with my wiring in the dash for the cd player or could the cd player outputs have gone bad,cuz it does it with all 3 outputs.this is very frustrating.i was powering a 10&quot; yesterday,and had little if no ground noise and then as soon as i put the amp on 4 6x8&#039;s and swap the rca from sub output to rear it starts.any help is appreciated .thanks guys!!charles</blockquote>

[QUOTE="TrickeffeX, post: 866753, member: 555688"] i have a 98 mustang gt w/out the mach stereo. i have a premier 860mp and 4 pioneer 3way 6x8's powered by a profile ca 640 4 channel amp. i just installed the 4 6x8's this morning.after i got through i cranked the car and 1st thing i heard was horrible ground noise.i re did my amp ground and even bout new rca's and its still there. i drove down the road and the ground noise would come on and off and on and off before it just stayed on. what could be causiing this?could it be somthing to do with my wiring in the dash for the cd player or could the cd player outputs have gone bad,cuz it does it with all 3 outputs. this is very frustrating.i was powering a 10" yesterday,and had little if no ground noise and then as soon as i put the amp on 4 6x8's and swap the rca from sub output to rear it starts. any help is appreciated . thanks guys!! charles [/QUOTE]

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