I use a 3805 in a 12 X 15 room (left side open to rest of house). I often listen at 100 db (RS analog meter, A setting, about 10' from speakers). Let's just say I'm sufficiently blown away on a regular basis with clean, powerful sound from these M80's. Mind you, I don't listen at that level for long periods of time, (why would you want to?) but the 3805 handles whatever I throw at it with ease. It does get warm to hot when I'm cranking it, but it hasn't gone into protect mode once.
If you have a significantly larger room and/or like it even louder, seperates may be for you.
