Years ago I used to hang around with the guys that were big into stereo gear, and I've seen a couple of them blow their amps because they didn't match speaker impeadance with their amps. Now these guys did make their gear work hard for competitions and the like, and always insisted speaker matching was important.
Of course my puny system wasn't matched, and I never did have any problems.

Just thought I'd mention it.

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1991 GMC Sonoma Ext Cab w/Isuzu diesel (converted March Mar 2003) - sold
1994 S10 Ext Cab w/Isuzu diesel (converted Mar 2008)
1998 Toyota Sienna XLE
B6100HST Kubota CUT DIESEL

1994 S10 with Isuzu diesel and 5spd
http://img.photobucket.com/albums/v6...S15/SigPic.jpg