Anything over 100-105 db in my room would give me headaches. I have a M&K MX 350 that is very tight and deep in a room that has been optimally tuned for my ears (that being no boominess or excessive midrange hardness or brightness). To me, anything higher and you seem to completely lose the subtle details of the soundtrack. Oh, there is still plenty of shake, rattle and roll, but it is contained in my room and is very nonfatiguing. But I guess to each his own, since many of us have different opinions on what enjoyable bass is when listening to movies. Just curious about what you like in your home theater set up. Regards all!