Need help to design crossover

Mikael Abdellah · 2nd January 2004, 08:37 AM

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?

mikee12345 · 2nd January 2004, 02:37 PM

Equations alone will only give you a number.
You need a program that will show the responses of the filters!

First stop-

http://www.eatel.net/~amptech/elecdisc/caraudio.htm

Second-
http://www.sound.westhost.com

third-
www.linearteam.dk

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

Fourth-
http://diyaudiocorner.tripod.com/software.htm

Actual programs that model filters properly wont come free.

Which is why,im going to buy an Active filter kitset..its easy.

theChris · 10th January 2004, 03:46 AM

there is a great filter designer online with a free and shareware version.

http://www.filter-solutions.com/

Mikael Abdellah · 10th January 2004, 06:44 AM

Good program but it seems to be all about opamp-based filters

Eargasm · 11th January 2004, 05:57 AM

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.

Mikael Abdellah · 11th January 2004, 06:19 AM

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 linkwitzlabs.com but I wanted to use readily available filter-IC's instead.

Mikael Abdellah · 11th January 2004, 03:50 PM

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.

2nd January 2004, 08:37 AM	#1
Mikael Abdellah diyAudio Member Join Date: Jan 2003 Location: Sweden	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?

10th January 2004, 03:46 AM	#3
theChris diyAudio Member Join Date: Dec 2001 Location: SIUE, Illinois, USA	there is a great filter designer online with a free and shareware version. http://www.filter-solutions.com/ __________________ if only it could be used for good, not evil...

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2nd January 2004, 02:37 PM	#2
mikee12345 diyAudio Member 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- http://www.eatel.net/~amptech/elecdisc/caraudio.htm Second- http://www.sound.westhost.com third- www.linearteam.dk the WINISD PRO can make simple Circuits.however it doesnt tell you the response. Fourth- http://diyaudiocorner.tripod.com/software.htm Actual programs that model filters properly wont come free. Which is why,im going to buy an Active filter kitset..its easy.

10th January 2004, 06:44 AM	#4
Mikael Abdellah diyAudio Member Join Date: Jan 2003 Location: Sweden	Good program but it seems to be all about opamp-based filters

11th January 2004, 05:57 AM	#5
Eargasm diyAudio Member Join Date: Mar 2002 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.

11th January 2004, 06:19 AM	#6
Mikael Abdellah diyAudio Member Join Date: Jan 2003 Location: Sweden	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 linkwitzlabs.com but I wanted to use readily available filter-IC's instead.

11th January 2004, 03:50 PM	#7
Mikael Abdellah diyAudio Member Join Date: Jan 2003 Location: Sweden	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.