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Old 2nd January 2004, 08:37 AM   #1
diyAudio Member
Join Date: Jan 2003
Location: Sweden
Question Need help to design crossover

I've been asked to build a complete audio-system for a friends car. The only thing I'm having problem with is the crossover. I now what I want, and what circuits I'm going to use, but I can't figure out how to "program" the circuits. I've read the complete spec-sheets several times, but since I'm no electronics engineer, I can't find the information I need.

The crossover will consist of 4 separate sections, 2 bandpass for the sub, and 2 highpass for the coaxial-units. All sections will be made with Maxim MAX263 and MAX267. I also have to figure out how "far apart" the BP- and the HP-sections should be to create a total signal of 0dB where both filters meet. (You will have to excuse my poor english, but I hope you understand what I'm babbling about).

Someone told me there is a book that explains all I need to know but I haven't found it. Does anyone know of such a book?

Has anyone worked with these filter-IC's before?
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Old 2nd January 2004, 02:37 PM   #2
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Join Date: Nov 2002
Location: NZ
Equations alone will only give you a number.
You need a program that will show the responses of the filters!

First stop-



the WINISD PRO can make simple Circuits.however it doesnt tell you the response.


Actual programs that model filters properly wont come free.

Which is why,im going to buy an Active filter kitset..its easy.
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Old 10th January 2004, 03:46 AM   #3
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Join Date: Dec 2001
Location: SIUE, Illinois, USA
there is a great filter designer online with a free and shareware version.
if only it could be used for good, not evil...
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Old 10th January 2004, 06:44 AM   #4
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Good program but it seems to be all about opamp-based filters
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Old 11th January 2004, 05:57 AM   #5
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Location: San Marcos, TX
the filter that you need to crossover a subwoofer effectively will be an active, or "op amp" based one. If you try to use a passive network on a subwoofer, you will have to have massive inductors, and the cost will become prohibitive.
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Old 11th January 2004, 06:19 AM   #6
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I'm very well aware of the difference between active and passive crossovers. But as I wrote in my first post, I will use Maxim's MAX263 and MAX267 to build the filters. I have read som about op-amp-based filters at but I wanted to use readily available filter-IC's instead.
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Old 11th January 2004, 03:50 PM   #7
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I think I found the book I was looking for. ISBN: 0750675470

I ordered as soon as I saw it. Thougt I'd post it here in case someone else is also looking.
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