Axiom Home Page Forums General Discussion Home Theater M80's and Bi-Amping???

>>No, I don't think it changes the impedance. I know that someone has the technical answer, and I've seen it before, but I don't remember what it is right now.

The best way to think about it is that the woofers and mid/tweets are active in different frequency ranges and that the crossover makes them seem to have a very high impedence outside those ranges. At low frequencies you might have a 4 ohm woofer and a 200 ohm midrange, while in midrange frequencies the numbers would be reversed. At the crossover point both speakers would appear to have a higher than nominal impedence (say 8 ohms instead of 4) and in parallel that still gives you 4 ohm effective impedence.