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Multi-Way Conventional loudspeakers with crossovers

Active crossover questions
Active crossover questions
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Old 12th June 2005, 06:09 PM   #1
jimbo1968 is offline jimbo1968  United Kingdom
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Default Active crossover questions

I plan to build 3way active front speakers, and although using a dcx2496 would be the easy option I would like to build the following if its not too much trouble/cost and can still be flexible.

I've got 3 stereo chipamp kits which will go into a box each and I was thinking I could put a band pass filter into each amp, with adjustable frequencies and gain. It doesn't matter if this costs more than using a dcx2496, but I'm thinking it should cost about the same as building a separate 6way Xover?

What I'd like advice on is what filters to use (and why). I must admit that I don't understand what the phase considerations are at crossover.

What if I just copy this design? http://www.siliconchip.com.au/cms/A_30278/article.html
Feeding the signal from one amp to the next.

Can I add a trim pot into the output opamp to adjust the gain for each of the drivers?

I'd like confirmation that this is feasible! The fact that I haven't found a previous example makes me worry that for some reason it's a dumb idea.

Also, my plan for setting all this up is to play pink noise and use RTA software to view the output!

And finally, how do I protect my tweeter from the amp switch on/off? Is it as simple as a capacitor in series?

Lot's of questions I know, but this way I may get some bites
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Old 12th June 2005, 09:51 PM   #2
Madmike2 is offline Madmike2  Canada
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Dude i always seem to put my posts in the wrong place but its fuzzy topics. Yours is definetly electronics.
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Old 12th June 2005, 10:22 PM   #3
jimbo1968 is offline jimbo1968  United Kingdom
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I am wondering where all the active fans are. A search on active crossover gives most hits for 'loudspeakers' and none (on the first) page for electronics.
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Old 13th June 2005, 01:36 AM   #4
Madmike2 is offline Madmike2  Canada
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Solid state guys not discussing these at all ? And what one were you thinking of buying? I say get a DBX 3way. The Rane is nice to but S/N is alittle low.
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Old 13th June 2005, 01:47 AM   #5
soongsc is offline soongsc  Taiwan
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If you design a high pass, a low pass, and a differential for the mid, it would be a much cleaner design. For 6 way, well take the low pass and do it again. Lot less OPAMPS.
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Old 13th June 2005, 02:23 AM   #6
Bill Fitzpatrick is offline Bill Fitzpatrick  United States
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Default Re: Active crossover questions

Quote:
Originally posted by jimbo1968


What if I just copy this design? http://www.siliconchip.com.au/cms/A_30278/article.html

Can I add a trim pot into the output opamp to adjust the gain for each of the drivers?
It looks like a good design to me. Id just copy it. The ariticle says there are no output adjustments but VR1-3 look just like that. I didn't read the whole thing. Are they offering boards?
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Old 13th June 2005, 02:29 AM   #7
Madmike2 is offline Madmike2  Canada
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Ya it looks like it comes with the board as well, complete kit unassembled. Hell 'I' might even be able to build it. ANd it is not a computer

Who is Mingus ??
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Old 13th June 2005, 02:37 AM   #8
Bill Fitzpatrick is offline Bill Fitzpatrick  United States
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Quote:
Who is Mingus ??
http://www.mingusmingusmingus.com/main/mingus.htm
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Old 13th June 2005, 05:17 AM   #9
audio-kraut is offline audio-kraut  Canada
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@jimbo 1968 - if you don't know mingus, why do you build speakers?
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Old 13th June 2005, 05:48 AM   #10
killerfishes is offline killerfishes  United States
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Quote:
Originally posted by audio-kraut
@jimbo 1968 - if you don't know mingus, why do you build speakers?
im not jimbo but...
its all about Beethoven, Liszt, the doors, Hendrix and some times TCM.
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