Hello All,
After a point the amplifier distortion becomes academic and the speaker distortion becomes dominate.
In my experience amplitude modulation side bands (Intermodulation Distortion) are far more offensive to my ears than HD.
See the Two Tone test posted as an illustration below. The Two Tone test, one 300Hz tone and the other tone 2500Hz both played at 2.83 volts.
You can see the two test tones and stair stepping harmonics at 5k, 7.5k.
You can also see IMD side band distortion peaks at 2500Hz, 5000Hz, 7500Hz and on up the stair steps.
This is all very much audible distortion; not amplifier distortion but speaker distortion.
So as to not gore anyone's ox the speaker is a discontinued Scan Speak P17WJ-00-08 in a sealed 0.55 cubic foot enclosure.
Thanks DT
Lab grade tools: APx555, APx1701 and AP426M16 microphone