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Crossover Resistance

Old 11-29-2008, 12:41 PM
50 Watt CAFz'r
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Crossover Resistance

Hey all,

I'm trying to hook-up a set of cross-overs and am a little confused about the resistance that will be seen everywhere.

Is there a fixed input resistance of the cross-over that the amp will see? Or is the resistance the amp sees a function of the resistances of the mid and tweeter? If it is the later, are the speakers then hooked up in parallel or series in order to get the resistance that the amp will see?

Any help and clarification would be greatly appreciated.


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Old 11-30-2008, 11:45 AM
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Ideally, the job of the crossover is to make sure the speakers only see the range of frequencies they can play properly. This means that the amp, at any given frequency, should only see one speaker at a time. If the drivers are all 4 ohms then the amp will see 4 ohms across the spectrum.

Reality - speakers don't have a constant impedance across their frequency range so the actual impedance the amp sees will fluctuate. Generally it is nothing to worry about though.

And most crossover designs have the components and speakers in parallel.
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