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Dearest Impedenceologists,What on earth does that mean anyway ?..what is Impedance in a speaker ? and why do some speakers have different impedance and what is the thing in the speaker that causes it to have the impedance that it does ?
In a loudspeaker drive unit, the reactance is predominantly Inductive - because the speech coil is a coil and, at audio frequencies, will just be an inductance. As the coil moves in and out of the magnet, there is a voltage, or back emf, induced (as in a generator) and this 'appears' as a significant contribution to the inductance.
I think Sophiecentaur has been the only person to mention crossovers so far, and it's really the impedance of the crossover that the amplifier sees, not the impedance of the loudspeaker voice coils (unless you're using an active crossover and multiple power amps).
Geezer:Impedance.It's fine to use the term for this. It just shows what you'd get if you measured V/I (Complex, of course). The measuring equipment doesn't know what's downstream or upstream.