Active Filter Four help

Cobra2 · 3rd April 2009, 02:54 PM

I need help configuring the AFF for my speaker-system.
What I need:
A 12dB(24?) crossover at ~ 550Hz.
A low frequency shelf (set one to boost ~ 4,5-5 dB from 180-190 Hz and below.
A high frequency shelf set for a gradual boost from ~ 2 dB at ~4,5kHz to ~ 8+ dB at 10kHz and beyond.

Is this possible?

Arne K

Cobra2 · 3rd April 2009, 09:24 PM

As far as I get...

Arne K

Cobra2 · 3rd April 2009, 09:31 PM

Speakers:

Arne K

Cobra2 · 4th April 2009, 06:03 PM

I tried the spreadsheet, but this only shows HP section(no LP?), and both manual & spreadsheet is missing a lot of information, unless you are a full-blood loudspeaker & filter-engineer...

Tried "TINA", this shows totally different values...

Arne K

m2003br · 4th April 2009, 07:03 PM

Arne,

Give a visit to the site of Siegfried Linkwitz. Very good staff about equalized crossovers.

Good luck,
Marcos

Cobra2 · 19th April 2009, 08:27 PM

Quote:

Originally posted by m2003br
Arne,

Give a visit to the site of Siegfried Linkwitz. Very good staff about equalized crossovers.

Good luck,
Marcos

THE filter-engineer writings to other engineers...

Playing around with "filterpro" finally gave me some useful numbers, implemented here.
The 20-turn trimpots were useless for finding suitable levels, removed and connected 20k stereo-pots instead.
It works!

If I now please could have some help making a low-lift, and a high-lift shelf...

Arne K

ttan98 · 19th April 2009, 10:50 PM

Hi,

BTW where did get your your Active Filter 4 PCBs and you purchase your components separately?

Thanks

Cobra2 · 19th April 2009, 10:55 PM

I have had them for some time...since the first group-buy...
The first boards were tested with "el cheapo" components, & used op-amps

Arne K

BobEllis · 19th April 2009, 11:07 PM

Arne -

The high pass and low pass are the same values, you just plug them in the appropriate spot on the board. Sorry if I forgot to put that in the manual.

I used the equal component value convention, the "Tina" calculation is probably for unity gain, which gives different values all around.

The calculator just gives you a starting point. You really need to measure the drivers in the application, calculate values, simulate, tweak, repeat.

djk · 21st April 2009, 10:00 AM

http://www.delta-audio.com/Active_Fi...our_manual.pdf

3rd April 2009, 02:54 PM	#1
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	Active Filter Four help I need help configuring the AFF for my speaker-system. What I need: A 12dB(24?) crossover at ~ 550Hz. A low frequency shelf (set one to boost ~ 4,5-5 dB from 180-190 Hz and below. A high frequency shelf set for a gradual boost from ~ 2 dB at ~4,5kHz to ~ 8+ dB at 10kHz and beyond. Is this possible? Arne K __________________ Ars longa, vita brevis

4th April 2009, 06:03 PM	#4
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	I tried the spreadsheet, but this only shows HP section(no LP?), and both manual & spreadsheet is missing a lot of information, unless you are a full-blood loudspeaker & filter-engineer... Tried "TINA", this shows totally different values... Arne K __________________ Ars longa, vita brevis

21st April 2009, 10:00 AM	#10
djk diyAudio Member Join Date: Feb 2001 Location: USA	http://www.delta-audio.com/Active_Fi...our_manual.pdf __________________ Candidates for the Darwin Award should not read this author.

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4th April 2009, 07:03 PM	#5
m2003br diyAudio Member Join Date: Dec 2004 Location: Sao Paulo	Arne, Give a visit to the site of Siegfried Linkwitz. Very good staff about equalized crossovers. Good luck, Marcos

19th April 2009, 10:50 PM	#7
ttan98 diyAudio Member Join Date: Apr 2006 Location: Melb	Hi, BTW where did get your your Active Filter 4 PCBs and you purchase your components separately? Thanks

19th April 2009, 11:07 PM	#9
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Arne - The high pass and low pass are the same values, you just plug them in the appropriate spot on the board. Sorry if I forgot to put that in the manual. I used the equal component value convention, the "Tina" calculation is probably for unity gain, which gives different values all around. The calculator just gives you a starting point. You really need to measure the drivers in the application, calculate values, simulate, tweak, repeat.

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