Usually from distortions occurring in the mid to upper frequency range.
One of the most common sources of fatiguing distortion comes from individual component's inability to accurately reproduce sharp transients and dynamics accurately. When these occur, the system cannot respond fast enough and fatiguing distortions occurs. Some may find sharp transients and extreme dynamics fatiguing as well even when accurately reproduced because these create the high pressure level variations in the air as sound is transmitted that can stress or fatigue the ear itself.
The problem is much more common with digital sources compared to analog/vinyl sources which is why I believe more find digital to be fatiguing than vinyl.
Planar and electrostatic speaker systems in particular ten to not move as much air and typically produce transients well and do not deliver in genreall deliver the extreme dynamics compared to conventional speakers using dynamic drivers. This makes them often an attractive option for those that may be fatigued by more dynamic designs.
One of the most common sources of fatiguing distortion comes from individual component's inability to accurately reproduce sharp transients and dynamics accurately. When these occur, the system cannot respond fast enough and fatiguing distortions occurs. Some may find sharp transients and extreme dynamics fatiguing as well even when accurately reproduced because these create the high pressure level variations in the air as sound is transmitted that can stress or fatigue the ear itself.
The problem is much more common with digital sources compared to analog/vinyl sources which is why I believe more find digital to be fatiguing than vinyl.
Planar and electrostatic speaker systems in particular ten to not move as much air and typically produce transients well and do not deliver in genreall deliver the extreme dynamics compared to conventional speakers using dynamic drivers. This makes them often an attractive option for those that may be fatigued by more dynamic designs.