Converting passive x-over into active x-over

Franklin · 25th October 2002, 09:04 PM

Hi,

I want to convert the attached HP crossover of my Infinity RS-1B speaker system from passive to active. My knowledge concerning crossovers is limited to very basic theory, so I need help and examples of a converted version. Any help is greatly appreciated.

Thanks in advance.

Fred Dieckmann · 25th October 2002, 09:33 PM

You haven't given us much to go on.

How basic is your knowledge?

Do you want a completely active crossover with four sets of stereo amplifiers?

Do you want to use commercial active crossovers or design your own? If yes to the second part, have you done any active filter design?

How much equipment for measurement do you have for measuring the acoustic and electrical frequency response.

This is a hell of a big project. Even with my knowledge and equipment it could take months depending on the amount of it that you actual what to build from scratch.

Fred

Peter Daniel · 25th October 2002, 09:49 PM

I was looking at that thread and didn't know what to say. I would probably start from looking at the specs of your speakers and find out the crossover freq.

Next thing I would use forum's search engine and find out all the available info on active crossovers. There is quite a lot out there with good examples. If you decide on particular approach, let us know.

planet10 · 26th October 2002, 05:51 AM

If you really want to mutate this I'd start one step at a time and work my way up. 1st step would be to just biamp. Lose the low pass on the upper midrange and the entire XO on the lower mid. Everything is 2nd order. You'd want to stick to that, and the same XO frequencies unless you have at least some of the kit Fred mentions.

And this question needs asking -- where are the woofers? Already active.

My personal take would be that you'd probably be way ahead to just start from scratch. This sucker is a 5-way with a back-fill tweeter -- way too many crossoover points to get things seemless.

dave

Franklin · 26th October 2002, 02:25 PM

Given the complexity I did not expect, I've decided to do some research on this topic and if further help is needed get back to the forum.

Thanks for advise given.

planet10 · 26th October 2002, 02:37 PM

Quote:

Originally posted by Franklin
Given the complexity I did not expect, I've decided to do some research on this topic and if further help is needed get back to the forum.

Please don't leave me in suspense -- where are the woofers?

dave

Fred Dieckmann · 26th October 2002, 02:46 PM

Great! Exactly the course to take!

And what do we have for our winner Johnny?

Here are some links and feel free to ask further questions. I did not mean to scare you off but just to place you at the proper destination for the start of your journey.

http://www.termpro.com/articles/xover.html

http://www.crossovers.com/links_to_other.html

http://www.tubecad.com/articles_2001...ers/index.html

http://www.tubecad.com/articles_2001...ers/index.html

Fred

P.S. Other suggestions and info on the RS-1s that might help, anyone?

"Please don't leave me in suspense"

No.... leave him in suspense

Then maybehe might run a search engine and find
http://www.bobbyshred.com/infinity.html

Franklin · 26th October 2002, 03:27 PM

Hi Fred,

Will take a look at links provided.

For Dave and others intersted in the complete
schematic of the RS-1B which has an active controller for the woofers, the PDF sheet can be watched or downloaded here:

http://www.cae-cd.com

Franklin

Peter Daniel · 26th October 2002, 03:49 PM

Here are two links on crossovers that I find useful:
i need and GOOD active XO
To Biamp or not to Biamp, that is the question???????

tbla · 26th October 2002, 03:50 PM

hi,

the short answer is : don't do it... it's impossible - only a few on this earth really know how to design loudspeakers.

but!!!!!!!!! if you like to fool arround and you are having fun working with speakers : do it.

but if you think you can save a few bucks or make a better speaker, it will be a total waste of both time and money.

good luck,
troels

ps if "cost is no object" check out the bigger atc active speakers.

25th October 2002, 09:33 PM	#2
Fred Dieckmann diyAudio Retiree Join Date: Oct 2002 Location: Spain or the pueblo of Los Angeles	I want to convert the attached HP crossover of my Infinity RS-1B You haven't given us much to go on. How basic is your knowledge? Do you want a completely active crossover with four sets of stereo amplifiers? Do you want to use commercial active crossovers or design your own? If yes to the second part, have you done any active filter design? How much equipment for measurement do you have for measuring the acoustic and electrical frequency response. This is a hell of a big project. Even with my knowledge and equipment it could take months depending on the amount of it that you actual what to build from scratch. Fred

25th October 2002, 09:49 PM	#3
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	This is a hell of a big project. I was looking at that thread and didn't know what to say. I would probably start from looking at the specs of your speakers and find out the crossover freq. Next thing I would use forum's search engine and find out all the available info on active crossovers. There is quite a lot out there with good examples. If you decide on particular approach, let us know. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

26th October 2002, 05:51 AM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	Re: This is a hell of a big project. If you really want to mutate this I'd start one step at a time and work my way up. 1st step would be to just biamp. Lose the low pass on the upper midrange and the entire XO on the lower mid. Everything is 2nd order. You'd want to stick to that, and the same XO frequencies unless you have at least some of the kit Fred mentions. And this question needs asking -- where are the woofers? Already active. My personal take would be that you'd probably be way ahead to just start from scratch. This sucker is a 5-way with a back-fill tweeter -- way too many crossoover points to get things seemless. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

26th October 2002, 02:46 PM	#7
Fred Dieckmann diyAudio Retiree Join Date: Oct 2002 Location: Spain or the pueblo of Los Angeles	I've decided to do some research on this topic Great! Exactly the course to take! And what do we have for our winner Johnny? Here are some links and feel free to ask further questions. I did not mean to scare you off but just to place you at the proper destination for the start of your journey. http://www.termpro.com/articles/xover.html http://www.crossovers.com/links_to_other.html http://www.tubecad.com/articles_2001...ers/index.html http://www.tubecad.com/articles_2001...ers/index.html Fred P.S. Other suggestions and info on the RS-1s that might help, anyone? "Please don't leave me in suspense" No.... leave him in suspense Then maybehe might run a search engine and find http://www.bobbyshred.com/infinity.html

26th October 2002, 03:49 PM	#9
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Here are two links on crossovers that I find useful: i need and GOOD active XO To Biamp or not to Biamp, that is the question??????? __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC


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26th October 2002, 02:25 PM	#5
Franklin Account Disabled Join Date: May 2002 Location: Overhere	Given the complexity I did not expect, I've decided to do some research on this topic and if further help is needed get back to the forum. Thanks for advise given.

26th October 2002, 03:27 PM	#8
Franklin Account Disabled Join Date: May 2002 Location: Overhere	Hi Fred, Will take a look at links provided. For Dave and others intersted in the complete schematic of the RS-1B which has an active controller for the woofers, the PDF sheet can be watched or downloaded here: http://www.cae-cd.com Franklin

26th October 2002, 03:50 PM	#10
tbla diyAudio Member Join Date: Jul 2002 Location: denmark	hi, the short answer is : don't do it... it's impossible - only a few on this earth really know how to design loudspeakers. but!!!!!!!!! if you like to fool arround and you are having fun working with speakers : do it. but if you think you can save a few bucks or make a better speaker, it will be a total waste of both time and money. good luck, troels ps if "cost is no object" check out the bigger atc active speakers.

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