CC'* right on this....since sound signals are AC, the speaker will work no matter what, and the stereo will not see a difference, though it WILL notice mismatch in resistance. Since it was said earlier that this problem existed even with the stock speakers, wiring mismatch (and resistance for that matter) can be eliminated as the problem. Thats why I am leaning to the idea of running all new power and grounds to the HU. Running a new ground is cake. Running new power was cake for me too, but only because my amplifier feed cable was closeby and I just tapped into that. My sound quality improved quite a bit after that little mod, and it cost nothing but time.
Welcome, downwardly mobile yuppies, to the dawn of the Age of Nefarious.
1993 SSEi - FrankenJinx - dead and gone.
1994 SSE (136K strong) - 180* t-stat,HD alternator, most unequipped SSE on the club, XM radio, Kenwood CD/MP3.
2006 Chevy Malibu Maxx LTZ - Custom 2.25" manifold-back exhaust w/FM-80. Probably the only Maxx with this system.