Broad,
Clipping could be another factor that affects all sound, not just high frequencies.
Also noise resulting from power source, nearby EM fields, etc.
Do you know if your setup might be clipping, even subtly/slightly when the problem occurs?
Once clipping and avoidable sources of noise are out of the equation, sound quality of good quality gear should be fairly optimal. THen it comes down more to personal preferences regarding the "flavor" of sound, which often no two people will ever agree upon exactly.
Clipping could be another factor that affects all sound, not just high frequencies.
Also noise resulting from power source, nearby EM fields, etc.
Do you know if your setup might be clipping, even subtly/slightly when the problem occurs?
Once clipping and avoidable sources of noise are out of the equation, sound quality of good quality gear should be fairly optimal. THen it comes down more to personal preferences regarding the "flavor" of sound, which often no two people will ever agree upon exactly.