87 on digital sources is full range when the record is also in the (full) recording spec.
All above 87 is saturated and give distortion.
I had 5k, 5.5k and 8k and never screw the volume over 80-and that was just for "try it". In my understanding playing digital sources for longer time above 65 and short time above 75 is only when the listener is thumb or the record is bad ;-)
That is my mind on that.

Robert



800v3/218/271/8k.2/5k5s smile /5kC/DSP3200/Reviver/
TT-ELP/Graham Slee Revelation/Trinnov Altitude 32/OPPO 205
__Ayon/HB/Shunyata/Miltzow -- power cables,
__Ayon/Jungson/Miltzow --analog, Miltzow-- digital,
__Vortex/WMA ,