I have an MTX 4004 amp rater at 72 watts per channel x4 rms. I have hooked up 2 100w rms 6x9's ans 2 45w rms 5.25 speakers and was wondering how to go about hooking up 2 100w rms tweeters. Will he amp have enough power and where do i hook them up as im out of speaker jacks on the amp.

 

Either you need another amp, or you need a passive crossover, to share an amp output.

If it were my choice, i'd use the crossover with the 6x9's in the rear and the tweeters in the front, so you only have mid-bass in the rear.

I have a couple of MB Quart crossovers, 12dB @ 4200 Hz. Make me an offer.