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try www.woofersetc.com or www.ikesound.com those are the two best online wholesale car audio stores that have a huge rep.

just as in home theater...u get what you pay for, go to a car audio shop and buy some good rca cables thicker the wire the better and make sure that your rca's are ran opposite of any power and ground wires....and try to make the cable as short as possible......hope this helps