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Old 21st July 2002, 07:09 PM   #1
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Red face DIY Active crossover !!!!

I think an active crossover could solve a lot of my troubles!!!!
Should be easy to go to my trusted hi fi vendor and buy a 3 way active crossover ( even if 2 is enought ) paying a lot of money.

But it's "only" a filter!!!!

Somebody has a good idea for building a 2 way active crossover.

I tryed to do something with a pair of uA741 op-amp but without good results.

What are the things to take care?
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Old 21st July 2002, 07:16 PM   #2
JoeBob is offline JoeBob  Canada
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Check out http://sound.westhost.com/project09.htm for a good diy active xo project. You could even build discrete buffers instead of the opamps if you wanted (but then you'd have to beef up the power suply too, but you get the idea).

Rod also wrote an article about the benefits of bi-amping, check it out here http://sound.westhost.com/bi-amp.htm it's got some good info.
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Old 21st July 2002, 07:18 PM   #3
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Default Re: DIY Active crossover !!!!

A good book is Don Lancasters Active Filter Cookbook.

Some links can be found on my Active XO links page and some Tube XO Schematics too.

Well worth considering is John Pomann's Active XO Experimenters Kit which has all the bits and alot of support docs to build an array of different configurations.

dave
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Old 23rd July 2002, 07:09 AM   #4
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Thank you all for tour suggestion, now i have a very good starting point to try the develop of a crossover

See you all later.
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Old 23rd July 2002, 08:22 AM   #5
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You don't need an op-amp to implement an active crossover. Follwers work fine, if not better.

Jocko
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Old 23rd July 2002, 06:17 PM   #6
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Default Passive active xover

Why not implementing an active system using different order passive filters at the input of each power amplifier?

The only problem such a system would have is the passive filter voltage loss, but nowadays that is not really such a big problem with solid state amplifiers.

We could get rid of the active parts in a crossover filter, and probably for good.

Any other thing against such a system?


Carlos
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Old 23rd July 2002, 08:59 PM   #7
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Default Re: Passive active xover

Quote:
Originally posted by carlmart
Why not implementing an active system using different order passive filters at the input of each power amplifier?
Implemented with Rs & Cs you max out at 2nd order, but it gets a bit droopy. Passive Line Level XOs. If you do it with C, L, R you can go to town. Vinylsavor has had some practical experience.

dave
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Old 23rd July 2002, 10:35 PM   #8
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Droopy is OK as long as your source has lots of voltage
and maybe current. Think of driving networks with a
small power amp, a perfect application for a SET.
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Old 23rd July 2002, 10:56 PM   #9
jleaman is offline jleaman  Belgium
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hey dave can you email me id like to ask yuo a few questions.

jleaman@citytel.net

Thanks.


J'
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Old 28th July 2002, 03:32 PM   #10
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May be a passive xover should be easyer to build, but, and maybe i'm wrong, the values of capacitors are higt, and i have to use elecrolitic unpolarized capacitors.

A lot of people that i know , me too ,don't like this because

- this capacitor must have a very low inductance value so they aren't easy to find and maybe are more expansive ( but this is the smaller problem)

- What about dimensions and matching accuracy?

- With an active xo i can easy change the freq

About followers, i'm shure that their sound is better than op-amp, but only if tey are well matched and i think it's not easy.

Lanz
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