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Old 3rd December 2011, 10:47 PM   #1
diyAudio Member
Join Date: Oct 2011
Location: Craiova , Romania
Exclamation Active Crossover - Builgind - Help

I have some questions for the more experienced one on this forum.

I want to build an active speaker crossover.I have 3 way speakers at home(diy ofc ),
The speakers at the moment have pasive-crossovers.
I would like to build a pair of active crossovers, on the high and mid sections.

Could you please help me on showing me some EXACT data on the matter?(schematics, diagrams, pictures etc etc etc)
The data on the internet is a bunch but (AS USUAL) I can`t find something more exact.
By more exact I mean a schematic with resistors, capacitors and other...and how to build it steps (ex: building 1.01)

I would appreciate it if you "took your time with me".I`m not that hard headed, I`m quite good with soldering, "stiching" etc etc.So if the steps are correct I wouldn`t be abble to mess it up.

Btw. if I need correcting please let me know.No hard feelings.
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Old 3rd December 2011, 11:45 PM   #2
MCPete is offline MCPete  United States
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Join Date: Nov 2005
Please take a look at the web-page that I'm providing a link to, Linkwitz-Riley Electronic Crossover

I haven't built Rod's project 9, nor do I have any real experience with active crossovers. So if you have questions about project 9, I might try to answer but would probably let someone else respond.

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Old 4th December 2011, 06:08 PM   #3
DougL is offline DougL  United States
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Location: Wheaton IL.
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I have some questions:
You realize you need 3 amplifiers.
You realize you probably need to do more than apply textbook filters. That would imply both measuring equipment and the skill to use it.
If it were me, I would buy a digital crossover, develop the system using it, then try to replicate it in analog.

For what you are doing, there is no step by step answer possible.

Good luck with your project.

Scienta sine ars nihil est - Science without Art is nothing. (Implies the converse as well)
Mater tua criceta fuit, et pater tuo redoluit bacarum sambucus
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Old 4th December 2011, 06:46 PM   #4
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Join Date: Dec 2004
Location: Israel
1. Theory + a bit practical: Active Filters
2. More practical: DELTA AUDIO - Active Filter one

Try to find the following boards:
DELTA AUDIO - Active Filter two
They are handy. They need lots of fixed precise resistors...
You need to chain them to get higher orders, more crossover points etc.

My take on the matter:
Active crossover: AXO3
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Old 4th December 2011, 08:58 PM   #5
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Join Date: Oct 2011
Location: Craiova , Romania
excuse me...after some re-checking i have comed to the following conclusion..

i want to build 2 pasive-filter with corection on its high and mid section.

any schematics on souch a thing?the values of capacitors and inductors I can calculate....its the schematic i`m worried about ...
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Old 4th December 2011, 09:41 PM   #6
MCPete is offline MCPete  United States
diyAudio Member
Join Date: Nov 2005
You will find a lot of information about passive crossover networks also at the website that I gave a link to the pages on active ones in my first post.

Following Rod Elliott's explanations, including schematics, I think would be considered to be introductory. In general he does a good job in his explanations. My apologies if you are more accomplished than the level that he assumes.
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Old 4th December 2011, 10:43 PM   #7
SunRa is offline SunRa  Romania
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Join Date: Aug 2004
Location: Romania

Well there are some decisions you have to make first. Do you have the frequency response of the two drivers you want to make a crossover for?

Knowing the response you can then decide for crossover points and hence for 1st, 2nd, 3rd or 4th order filters of various characteristics (Linkwitz Riley, Bessel, Butterworth, etc), whether it's serial or parallel, etc.

After this you can take in consideration various correction circuits (baffle compensations, zobel networks, notches, etc.)

It's not like you find a schematic somewhere and hope it fits. Some great resources have been posted already, here's another one: Passive Crossover Network Design

Also, for some more advanced topic check this: Tech
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