Well I can confirm that the Onkyo 875 does shutdown at high volume levels when powering the M80's. Last night I managed to have it shutdown several times. The volume level at amp shutdown was pretty high at around 100db from my seating position however I would like to run at this level and up to 105db only for demo purposes(short periods of time). I am currently running the M80's full range with no sub.
Would the receiver draw less current if I was using a sub and have the M80's crossed over at 80hz thereby enabling me to run the receiver at volumes greater than 100db?
Does the receiver cut out due to overheating or just being overloaded? Would cooling fans enable the receiver to run at higher volumes? If the receiver is rated for 140 watts at 8 ohms, does this mean that the equivalent load on the amp into 4 ohms would be 70 watts?
Will running the receiver at volumes causing it to shutdown cause any damage to the receiver if done frequently?
