theREALdotnet
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And I note the real, minimum bass impedance. That number almost never, ever matches the specs manufacturers publish.
I think everybody here understands that the actual impedance of a speaker can both dip below and far exceed its nominal impedance. However, a 4-ohm speaker is one with a nominal, rather than minimum, impedance of 4 ohms. I don't think the vast majority of speakers have a nominal impedance of 4 ohms.
How useful is the specified nominal impedance? Probably not very, much like the claimed power output of amplifiers