Actually, I discovered after my 2 year relationship with a pair of Heresys is that they play more accurate and without the "shout" at low volumes. I loved them late at night. I didn't like them when I pushed them hard. Yes, they have a reputation of being able to play loud but, IMHO, they play better and more accurate at low to low medium levels.
I did have to modify my pair to find ultimate enjoyment, as well as couple them to a pair of subs. However, I do like to listen at moderate to loud levels, so, eventually I sold them.