crossover on the high pass

A friend of mine asked me the other day if it was ok to put a 3-way x-over on the High Pass leads from the source, and branch each output from the XO to high pass input terminals on his amps. He figured it could work as a way to bandpass certain channels using the LP filter of the amp and the HP filter of the XO. I never heard/thought of that and couldn't form a answer. Anyone?This is what I do for FUN!

If the low pass filter of the amp is set to a higher frequency than the high pass filter of the radio, then yes this will essentially make a bandpass filter.  Radio set to 160Hz high pass and amp set to 500Hz lowpass would produce frequencies from 160 to 500Hz

AH cr@p! LOL I meant High Level leads! He wants to run the source's front channel high level leads to his component set's XO's, then from the output of the XO's, both tweets to one high level input of a 2ch amp, the mids to the high level input of a different 2ch amp. I'm curious if there's anything different about the inner filters of a source that could not be duplicated by wiring in this fashion. I apologize for that last post. I hope this post makes sense!This is what I do for FUN!

That will not work.  A passive crossover is dependent of the speaker's impedance in order to work.  If you install an 8Ohm driver onto a crossover designed for a 4Ohm driver, it moves the crossover point a full octave.  The input impedance of an amp is thousands of Ohms. 

thanx IdiThis is what I do for FUN!