NO bdpf....I can NOT find the drawings for this 1980's amp,Or very little else, number 1. Number 2, if a 2011 amp, dosen't have a better protection setup, then a 1980 amp...there is pretty much something wrong.

Why in hell would you think circuits from 1980, would work all that dam well?????

I said ...I DON'T KNOW..what they used...SO I can't TELL how many times you can throw it into protection mode, without damageing the dam thing. What the hell is your problem????

I have said NOTHING wrong about the M80's......All i stated was this amp, dose NOT seem to work well with a 4 ohm load.