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Old 7th December 2008, 11:50 AM   #1
Redgum is offline Redgum  Australia
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Default Crossover help

I took apart a pair of speakers to have a look at the crossover (see below/attachment). Not certain if I have interpreted the crossover correctly, can anyone work out the crossover frequency? The tweeter is 3rd order and the woofer is 2nd order.
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Old 7th December 2008, 11:51 AM   #2
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Sorry mate; but I see no picture or link, what are the values?
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Old 7th December 2008, 11:53 AM   #3
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OK now I see the attachment, what's the nominal impedance of the speaker?
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Old 7th December 2008, 12:08 PM   #4
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A wild guess would be an 8R tweeter about 3500/3700Hz, but the woofer values don't look standard so we need to know the DCR of the woofer to guess the impedance
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Old 7th December 2008, 01:27 PM   #5
Redgum is offline Redgum  Australia
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Resistance measured with a multimeter, the woofer is 7.2 ohms and the tweeter is 7.6 ohms. Drivers are produced in house no data available.
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Old 7th December 2008, 05:48 PM   #6
Ron E is offline Ron E  United States
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You can't know the crossover frequency without knowing the impedance and frequency response curve of the drivers. a DC resistance measurement is a hint, but not good enough. A 2nd order LP may be a 3rd or 4th order acoustic depending on driver FR, and likewise with the HP filter...

Download LTSpice (or speaker workshop) and model the circuits and look for the -3dB point for each of the lowpass and highpass, when terminated by a resistor. That's the best that can be done with the info provided.
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