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RE: Compression - you hardly ever see measured

Firstly there is no such thing as 'DC impedance'. If it's DC it is called resistance.

Secondly if the driver impedance changes (resistance is part of it) the crossovers crossing point changes too in not necessarily predictable ways and that is really not good.
This also the reason why a xover designed for 4 Ohm drivers can not be used with drivers of a different impedance.

For example a 2nd order low pass at 2000Hz for a 4 Ohm driver requires a 0.593mH inductor in series and a 18.51 µF capacitor in parallel.
A 2000Hz low pass for an 8 Ohm driver wants 1.185 mH and 9.254µF.
As you can see the inductor needs to be bigger while the cap needs to be smaller so a driver which has changed impedance due to heating of the voice coil will play havoc with the correct functioning of the crossover.

PS: I do not like under damped woofers at all. They sound 'mushy' and lose a lot of detail.
I do not use tube amps for that very reason.
All my favourite speakers are active and thus the woofer is maximally damped. Gets me closer to the original sound than anything with a passive xover. The worst sound (as in furthest from reality) to my ears are passive speakers driven by tiny SETs. There is just nothing right about the sound from them.


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