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1. In a 3-way home speaker I have the typical passive X-over dividing up the frequencies between the woofer, mid and tweeter. Given that each driver has an impedence of 8 ohms, how do I know what the final impedence of the entire system is? Do I apply the formula for calculating the ohms of resistors connected in parallel? Or do the X-overs play some part in the impedence via the fact that each driver only sees it's portion of the overall bandwidth? Or, is there some way I can measure the impedence myself? It would be better if the impedence could be calculated before-hand so that I can design it to fit the specifications of my amp.

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2. Ok, so much for my original question. Now, after reading through those threads I am wondering about the benefits/tradeoffs between active and passive X-overs. I'm building a new system in my car and I've always used passive X-overs in the past. But now I'm wondering if active X-overs might be the better choice.