Audio Active Filter

Milo · 6th March 2005, 05:28 PM

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

jcx · 6th March 2005, 05:36 PM

http://www.linkwitzlab.com/filters.htm

Bill Fitzpatrick · 6th March 2005, 05:46 PM

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.

Milo · 6th March 2005, 06:20 PM

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

richie00boy · 6th March 2005, 07:10 PM

ESP site has articles and a project to suit your needs. Boards are also available at a good price.

1543 · 6th March 2005, 08:00 PM

Hi,

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

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

Arne

djk · 7th March 2005, 12:54 AM

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.

richie00boy · 7th March 2005, 07:39 AM

Can you elaborate on what the problem is, I can't seem to spot it with a quick look at their site.

MBK · 7th March 2005, 08:02 AM

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??

Milo · 7th March 2005, 08:20 AM

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

6th March 2005, 05:28 PM	#1
Milo diyAudio Member Join Date: Apr 2003 Location: Gorizia, Italy	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

6th March 2005, 07:10 PM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	ESP site has articles and a project to suit your needs. Boards are also available at a good price. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

7th March 2005, 07:39 AM	#8
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Can you elaborate on what the problem is, I can't seem to spot it with a quick look at their site. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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6th March 2005, 05:36 PM	#2
jcx diyAudio Member Join Date: Feb 2003 Location: ..	http://www.linkwitzlab.com/filters.htm

6th March 2005, 05:46 PM	#3
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	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.

6th March 2005, 06:20 PM	#4
Milo diyAudio Member Join Date: Apr 2003 Location: Gorizia, Italy	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

6th March 2005, 08:00 PM	#6
1543 diyAudio Member Join Date: Jun 2004 Location: Ruhrgebiet	Hi, does anybody know these crossover-boards from BMM-electronics? http://www.bmm-electronics.com/Produ...roduct_ID=2305 Arne

7th March 2005, 12:54 AM	#7
djk diyAudio Member Join Date: Feb 2001 Location: USA	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.

7th March 2005, 08:02 AM	#9
MBK diyAudio Member Join Date: Apr 2002 Location: Singapore	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??

7th March 2005, 08:20 AM	#10
Milo diyAudio Member Join Date: Apr 2003 Location: Gorizia, Italy	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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