i got a kenwood KAC-6404 with kicker DS 680s and DS 5250s. the speakers get 35w RMS(4 ohms), and the amp can push out 50w RMS(4 ohms) to each channel ( 4).
lets say i have all 4 of the speakers hooked up, and they're all tuned right.
then, i bridge some tweeters my friend gave me (Rockford tweeters 50w RMS @ 4 ohms) to the front channels on my amp.
so now my amp should be running 70w RMS @ 2 ohms on the front channels and 35w RMS @ 4 ohms on the back, and that's not bad for it, is it?