i do not think the M80's have a 'peak power' shut-off type safety valve. i am not positive on this, but i have never heard anyone mention it. hopefully alan will chime in and clarify.
i can say this. if you actually push your M80's with the full 500 watts, it aint gonna matter if the speakers are blown or not, cause you will be deaf. unless you have them set up in a gymnasium, the 80's will be painfully loud. my M60's being pushed with 100 watts becomes painful well before maximum volume.
bigjohn
