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Old 26th May 2008, 03:30 AM   #1
focal7C is offline focal7C  Australia
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Default Determine crossover frequency of existing XO

Is it possible to determine the crossover frequency of an existing 2-way speaker crossover with limited info?

I believe it is a 2nd order with two caps and two coils. From other examples it looks like they are in a parallel configuration.

The capacitor values are 10uF and 4.7uF respectively.

There are no listed values on the coils (wound around a plastic spool with small air hole in the middle). Can they be measured on the circuit board with a volt/ohm meter?
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Old 26th May 2008, 09:07 AM   #2
forr is offline forr  France
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Hi Focal7C,
Measuring the voltage vs frequency response across each driver gives you the overall voltage response of the passive filter and its load. You need a sine generator and your multimeter needs to be linear up to 20 kHz (beware your ears) There are some free software on the net which can help you, you can even measure your coils.
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