I have spent my first month pushing the envelope of high volumes "these really to "go to 11". For the most part I found the sound didn't fall apart (if it had I would not have kept pushing the envelope)). Where I did find the sound falling apart at higher volumes was with poorly recorded pop/rock which was in my collection at 128kps. (Like you initially when I ripped my collection I was worried about space constraints and about 25% were done at lower rip rates or were downloaded as such,.)
My higher resolution stuff 192kps 320kps AAC or AIFF stuff only falls apart where there were limitations of the original recordings. A by-product methinks of sound/recording engineers in the early 1970s showing up to work having had a handful of Quaaludes for breakfast.
However in many cases recordings of this era truly find themselves in the Pantheon of what the 846 can do and where it can take you - what joy can be found in pulsing it to the "Edge."
Frank Zappa, any Steely Dan (Hey Nineteen - " The Cuervo Gold, The fine Colombian Make tonight a wonderful thing" an exceptional example) and of course Pink Floyd - just three of favorites ..Oops drifting OT a bit
As to what are Dangerously elevated levels well to borrow from the late Doctor (HST) himself
"“The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over.” Hunter S. Thompson
In the interest of keeping my hearing and /or not having permanent ringing in my ears a la Pete Townsend I have as of late been limiting my volume to 75% max (except for the odd passage then you got to light the afterburners and let it rip).
I am pretty certain the that near dangerous point/edge is somewhere before the point where blood starts to flow freely from your ears.
IF you have blood flowing from the ears that will interfere with your the sound causing it to "fall apart" at that point IMO you may you have set the volume a tad to high and might want to turn it down a bit.. But that's just me
Hahaha, I did heartedly chortle at this.
I hope I am dead before I am deaf!