He said the speakers are. Not the tweeters. I'm sure they wouldn't be 100RMS, thats quite a bit for a pioneer tweeter.
Infact, a decent 4 channel would be easiest. you just run the tweeters of 2 channels with the active in bult crossover on 1.5khz or so and the 6.5s on full range. Wait, actually that might not sound too good. I still vote for a 2 channel amp and a decent crossover.