Yes, and impedance at the specific frequency, not the DC value, unless you are dealing with Planar or DD where Z=Rdc for 99% cases.When you're trying to crossover drivers, do you have to take into account the driver's own impedance?
NoDoes every driver have to have similar impedances for them to work well together?
In most cases the R is not necessary.When calculating for R for high/low pass filters, what else should be taken into account besides the resistor to be added, if the resistor is necessary after all.
You need to consider electrical phase of the driver and how it fits into the rest of the design, in most of the cases when you use cap your positive wire (with the cap) has to go to the negative soldering pad of the driver to invert the phase otherwise you'll get some phase cancellations between woofer and tweeter.
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