Well, I can only have them but so loud before they start to sound bad in my opinion. Maybe it's part distortion but the "brightness" people talk about especially with the M60s seems to become more pronounced when I really crank it up and the high frequencies just become too much. I'm powering the whole setup with one of the older non-elite mid level Pioneer receivers and it seems to work really hard with especially loud cooling fans kicking in when the volume goes to anything over -10.

But yeah...needs moarbass!

M60|VP150|2xQS8|PSA XS30+Epik Empire|Pioneer Kuro 6010FD|PS3|Denon AVR-X4000|Parasound 5250v.2|