Ken,
Question: What is the warning sign that your amps are running out of power? I don't want to clip the tweeters!
Don't worry about damaging the speakers. If you have any kind of hearing ability at all, you'll start hearing the amps clip well before you do any damage. Well, if you were a grunge/metal head, you might like that effect, but other than that you'll know something's wrong.

What you'll hear will start as an "edginess" or somewhat excessively bright sound. That's the result of harmonic distortion being generated by the square waves resulting from amplifier clipping. Square waves are nothing more than a series of odd harmonics of descending amplitude being summed together - from a Fourier Analysis standpoint (mathematics), that is.

Whatever.
If you start pushing things beyond that, you'll really start hearing it as "distortion" at the mid and higher frequencies. You'll likely never hear the bass distort until it's really bad. One of our customers (
Christof) has a pair of amps that I believe are the same as yours. Anyway, he actually pushed them so hard the amps got hot and/or went into current limit protection and shut down! He has a huge room and had to be cranking them really loud though. Point is...he never damaged the speakers.

So don't sweat it and have fun.

-Bob
EDIT: PS. They'll take a lot more clean power than you have - try 750 WRMS like we have! No...not on highly compressed rock/metal music, but wide dynamic material like jazz? Yeah baby! aa