like the subject line says, will i have to change the rear speakers as well? i vaguely remember hearing that when changing the concert head, the rear speakers wont work cuz theyre amplified or something..

Oh, also, size of the rears? bose is 6.5 oversize, are the concert rear speakers 6.5 oversize as well??

just ordered the fit kit and antenna adapter from crutchfield for $18.. they didnt have any info on nonbose heads..
TIA,
brian

I think the amplifier for both rear speakers is on the left speaker. If you can get the right level signal to the rear speakers they may not need changing, but otherwise if you're running an external amplified signal to the rear speakers, I think you'll need to replace your rear speakers (or rig your way around the built-in amplifier perhaps).