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Old 6th March 2005, 05:28 PM   #1
Milo is offline Milo  Italy
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Default Audio Active Filter

Hi all,

I have to make an active audio filter with the following specs:

- Low-pass < 200 Hz
- Band-pass: 200 Hz - 2.0 kHz
- High-pass: 2 kHz- 20 kHz

Which type do you suggest? I thought to make it with Bessel type.

Is UAF42 universal filter suitable and good in terms of noise for a quality audio application?

Any suggestion will be very appreciated.

Thanks

Milo
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Old 6th March 2005, 05:36 PM   #2
jcx is offline jcx  United States
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http://www.linkwitzlab.com/filters.htm
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Old 6th March 2005, 05:46 PM   #3
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That chip locks you into 2nd order which may or may not be suitable for the drivers you are going to be using. I assume you are tri-amping.
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Old 6th March 2005, 06:20 PM   #4
Milo is offline Milo  Italy
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Hi Bill, Hi jcx,

thanks for your support.

Yes Bill, I am going to make a triamp. Any suggestion?

jcx, you moved me to a very professional website, excellent indeed, but I need, at the moment, a more practical circuit. The maximum should be: " Hi Milo , here is the circuit you need, it works very good and, if you need also the PCB, you can download here.....".
Of course I am asking a lot, but such approach could be wonderful.

Thanks again

Milo
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Old 6th March 2005, 07:10 PM   #5
Did it Himself
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ESP site has articles and a project to suit your needs. Boards are also available at a good price.
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Old 6th March 2005, 08:00 PM   #6
1543 is offline 1543  Germany
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Hi,

does anybody know these crossover-boards from BMM-electronics?

http://www.bmm-electronics.com/Produ...roduct_ID=2305

Arne
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Old 7th March 2005, 12:54 AM   #7
djk is offline djk
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The BMM is not designed properly for the mid output.

At first ESP made this same mistake, and has corrected it now.

Buy the boards from ESP.
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Old 7th March 2005, 07:39 AM   #8
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Can you elaborate on what the problem is, I can't seem to spot it with a quick look at their site.
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Old 7th March 2005, 08:02 AM   #9
MBK is offline MBK  Singapore
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I was wondering about the L/R 3 - way connection issue as well:

- Siegfried Linkwitz himself in his Phoenix etc, connects all three bands, the HP for high, the BP for mid, and the LP for low, straight from the buffer and in parallel, as does BMM.

- But ESP connects the LP of the low section in series after the LP section of the mids. What gives??
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Old 7th March 2005, 08:20 AM   #10
Milo is offline Milo  Italy
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Hi all, thanks all for your info. I had a look to ESP and BMM filters. ESP seem to be honestly made and with a good price. BMM seem to be excellent made, with excellent components.
About their behavior, I know nothing. I'd like to know, if possible, which of them could be the best. Please try to explain.

Thanks again

Milo
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