Sokel
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I picked the first four from speaker threads:I can't say I know what is typical for the speakers that really give these types of amps problems. But with the C-note impedance curve (simulated below), there is minimal wiggle except for the strong resonant peak, so pretty similar shape to the case of a pure resistor load. If you know of speakers that would cause a more chaotic curve I would sincerely like to know about them just out of curiosity.
View attachment 352006
The first three would have a single peak,narrow or broad (third one broader up to the top probably) at different frequency areas,the fourth one will have a double one covering quite a range.