Nonlinearity, maybe not, depending on mechanical damping.Not sure speaker performance would differ much between a DF of 4 and 1,000,000 (esp when you consider other resistances in the speaker circuit).
But frequency response, of course. If I plug the corresponding values for HD598s into my FR calculator (I looked them up - Zmin = 55 ohms, Zmax = 280 ohms), a DF of 4 gives me a FR deviation of 1.5 dB, which is not major but clearly audible in A/B. Using a nominal 4 ohm speaker with 3.2 ohms min and 10 ohms max yields about the same. This'll probably be swamped if you just move the speakers around a bit in an untreated real-life room (points for the headphones!), but still.
Quite strange because high impedance drive on a loudspeaker may impair its frequency response but generally, it decreases non linear distortions (THD).
Probably you are referring to acoustical THD; as far as the electrical THD is concerned, this one clearly raises as the output impedance raises if the relationship between I and V in the load is non linear. The question is: how electrical THD relates to acoustical THD?
L.
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