Originally Posted by hoodust

No longer stereo? That's incorrect... it is still a two-channel source. Adding more speakers doesn't make it "surround sound"

I haven't tested this, but my point was that you might have better left/right staging with rear speakers.

Besides, by your logic it isn't "stereo" now because of the tweeters in the dash.

The only way staging wouldn't matter in rear speakers is if you had a sub and bridged left/right channels (since bass is theoretically non-directional).