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7th June 2005, 05:47 AM
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#1 |
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diyAudio Member
Join Date: Nov 2003
Location: N London
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What's this crossover?
Just when I thought I might start to understand, I pulled this bundle of wires out of a 27year old set of ALBA speakers. Can anyone figure out what is going on here?
They sound ok but lacking in top perhaps. the "tweeter" is a 2" paper cone! BTW sorry about the symbols. Standard AutoCAD. Does anyone know where to get a set of SI symbols? |
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7th June 2005, 05:50 AM
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#2 | |
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diyAudio Member
Join Date: May 2002
Location: Switzerland
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Quote:
Regards Charles |
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7th June 2005, 06:06 AM
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#3 |
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diyAudio Member
Join Date: Jun 2001
Location: Eugene, OR
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Actually, it's not.
It's a second order low pass with a tweeter that won't put out squat. |
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7th June 2005, 06:25 AM
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#4 |
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diyAudio Member
Join Date: Nov 2003
Location: N London
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I think I get it . The components are being used by both drivers at once. The tweeter becomes a coil for the woofer's circuit
So I get a 2nd order butterworth hi pass, and a band pass. Like these. http://www.carstereo.com/help/Articles.cfm?id=9 Is it ok to do that? Can an inductor work properly with 2 jobs? Using the calculator and the 20uF value for the cap I guess the crossover frequency is 700Hz. Am I thinking correctly? If I swapped the paper tweeter for a nicer 8ohm dome. Would the change of inductance make a big change? |
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7th June 2005, 06:50 AM
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#5 | |
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diyAudio Member
Join Date: Mar 2005
Location: Taiwan
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Quote:
__________________
Hear the real thing! |
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7th June 2005, 06:50 AM
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#6 | |
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frugal-phile(tm)
diyAudio Moderator
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Quote:
Why isn't it a series XO bill... sure looks like it to me. That it has the extra C on the tweeter is kinda weird. dave
__________________
community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA |
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7th June 2005, 06:51 AM
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#7 | |
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frugal-phile(tm)
diyAudio Moderator
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Re: What's this crossover?
Quote:
dave
__________________
community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA |
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7th June 2005, 06:54 AM
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#8 |
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diyAudio Member
Join Date: Mar 2005
Location: Taiwan
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Planet10,
What happened to the cat picture?
__________________
Hear the real thing! |
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7th June 2005, 07:03 AM
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#9 | |
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frugal-phile(tm)
diyAudio Moderator
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Quote:
dave
__________________
community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA |
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7th June 2005, 07:07 AM
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#10 |
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diyAudio Member
Join Date: Nov 2003
Location: N London
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HOLD THE PHONE!!!!!!
The lights are on now. That last band is gold not brown. So the resistor is 4.7 not 470. It is deffinatly in series soongsc. |
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