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Old 25th October 2002, 09:04 PM   #1
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Default Converting passive x-over into active x-over

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.
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Old 25th October 2002, 09:33 PM   #2
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Default 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
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Old 25th October 2002, 09:49 PM   #3
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Default 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.
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Old 26th October 2002, 05:51 AM   #4
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Default 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
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Old 26th October 2002, 02:25 PM   #5
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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.
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Old 26th October 2002, 02:37 PM   #6
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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
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Old 26th October 2002, 02:46 PM   #7
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Default 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
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Old 26th October 2002, 03:27 PM   #8
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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
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Old 26th October 2002, 03:49 PM   #9
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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???????
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Old 26th October 2002, 03:50 PM   #10
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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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