Determine crossover frequency of existing XO

focal7C · 26th May 2008, 03:30 AM

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?

forr · 26th May 2008, 09:07 AM

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.

26th May 2008, 03:30 AM	#1
focal7C diyAudio Member Join Date: Jan 2008	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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26th May 2008, 09:07 AM	#2
forr diyAudio Member Join Date: Dec 2004 Location: Next door	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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