EDIT: I've also had them at about +4 for ten minutes or so one time, but it's just too loud.
LOL...I hear ya!
With my current HT setup I was playing a SACD demo disk that had this piano part. I had it at around the +4 or 5 range which made it sound like I had my head inside the piano. During the test I ran out to my truck to get something...I was dumbstruck by the sound outside. It sounded like the piano was on my front lawn! Needless to say I went back in and turned it down to more reasonable levels. The neighbors never said anything but I'm sure they weren't impressed...or maybe they were!
