High Efficiency Speaker Asylum

Need speakers that can rock with just one watt? You found da place.

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on the other hand, HD levels of most loudspeakers is high

Posted by mhardy6647 on November 20, 2020 at 07:01:49:
-- one or two orders of magnitude higher than the distortion of the upstream electronics chain.
And, at low frequencies, much of that HD is of the "euphonic" kind -- so-called "second harmonic" (i.e., one octave above the fundamental); oft referred to as "doubling" in the realm of woofers.
I don't think (FWIW) that euphonic HD is what makes a good SE(T) amplifier sound good.
The example above from ASR is randomly, arbitrarily, and ~~slightly~~ somewhat misleadingly chosen. ;) It is a small, inexpensive loudspeaker. Note that at very low frequencies (30 Hz), the (EDIT) THD is nearly 100%. Interstingly, it's mostly 3rd HD, though.