Here is a distortion plot of one of the other Edifier loudspeakers (not yours, but similar):
The first plot shows the HD at 86 dB, while the second shows it at 96 dB. My ears (which are not 29 years old anymore) would tell me to stop listening to these loudspeakers. If your S1000Mk2's are anything like this (and there's reason to believe they are not far behind this kind of distortion), note that harmonic distortion turns into
modulation distortion, which makes the speaker sound opaque and harsh (not the harmonic distortion itself).
I'd recommend looking at the measurements of other loudspeakers on this site, and find something with much lower levels of HD--probably much less than 1% at 90 dB is a good target, especially 1% distortion above 1 kHz. I'd recommend something that has a recess around the tweeter, and a better high pass cutoff on the tweeter at low frequencies than this model has.
Chris