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Old 3rd April 2009, 02:54 PM   #1
Cobra2 is offline Cobra2  Norway
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Default 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
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Old 3rd April 2009, 09:24 PM   #2
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As far as I get...

Arne K
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Old 3rd April 2009, 09:31 PM   #3
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Speakers:

Arne K
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Old 4th April 2009, 06:03 PM   #4
Cobra2 is offline Cobra2  Norway
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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
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Old 4th April 2009, 07:03 PM   #5
m2003br is offline m2003br  Brazil
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Arne,

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

Good luck,
Marcos
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Old 19th April 2009, 08:27 PM   #6
Cobra2 is offline Cobra2  Norway
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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
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Old 19th April 2009, 10:50 PM   #7
ttan98 is online now ttan98  Australia
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Hi,

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

Thanks
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Old 19th April 2009, 10:55 PM   #8
Cobra2 is offline Cobra2  Norway
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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
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Old 19th April 2009, 11:07 PM   #9
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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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Old 21st April 2009, 10:00 AM   #10
djk is offline djk
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http://www.delta-audio.com/Active_Fi...our_manual.pdf
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