I have not actually measured sound levels with a SPL meter. My HT room is fairly large - about 60x20x9 cft. I need a lot of amp power to fill up the room with sound! I don't listen to music at levels that would damage my hearing! :-)

4 M80s/VP150/EP600/Denon AVR-5308 & DVD-2910/
2 QSC SRA3622(1100wattsX2)/Carvin 1800HD(600wattsX2)