Crossover help

Redgum · 7th December 2008, 11:50 AM

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.

Moondog55 · 7th December 2008, 11:51 AM

Sorry mate; but I see no picture or link, what are the values?

Moondog55 · 7th December 2008, 11:53 AM

OK now I see the attachment, what's the nominal impedance of the speaker?

Moondog55 · 7th December 2008, 12:08 PM

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

Redgum · 7th December 2008, 01:27 PM

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.

Ron E · 7th December 2008, 05:48 PM

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.

7th December 2008, 11:51 AM	#2
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Sorry mate; but I see no picture or link, what are the values? __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

7th December 2008, 11:53 AM	#3
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	OK now I see the attachment, what's the nominal impedance of the speaker? __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

7th December 2008, 12:08 PM	#4
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	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 __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

7th December 2008, 05:48 PM	#6
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	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. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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7th December 2008, 01:27 PM	#5
Redgum diyAudio Member Join Date: Jun 2006	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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