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Old Yesterday, 10:19 AM   #1
raelman is offline raelman  Spain
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Default Notch Filter and Crossover Calculator

Hello everybody:

I'm plannig a new building: Vifa XT25 + Fountek Fw146 + Fountek Fw200

I have calculated a theoretical crossover from the FRD/ZMA cueves traced with SPL Trace from the manufacture's data. Attached you can find the Xover.

What I can't calculate not simulate is the appropiate Notch filter needed to smooth the resonance on the Fw146 at 5kHz.

Could anybody help me or calculate the appropiate notch filter?
I think the filter should correct from 5 to 20 kHz about 12db/octave

Thank you in advance to everybody!
Attached Images
File Type: png Xover1.png (130.9 KB, 120 views)

Last edited by raelman; Today at 02:11 PM. Reason: thank you!
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Old Yesterday, 11:28 AM   #2
Lojzek is offline Lojzek  Croatia
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Not a great idea to attenuate the response of the bass driver.
Better use more sensitive midrange and pad it later. You are
making yourself job more difficult working with aluminum.

Try increasing the C and L value for the mid LP filter and see
how it looks. If that does not help, add another inductor for a
3rd order. After these modifications you will know better how
to proceed.
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Old Yesterday, 12:40 PM   #3
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I suggest the OP download Xsim software (free) and try his design once again as a sanity check. Harris Tech., while nice, is not my favorite any more since the recent release of Xsim by Bill Waslo. There is a thread in this forum from BW that introduces the software.
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Old Yesterday, 03:23 PM   #4
raelman is offline raelman  Spain
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Well, trhe problem, as a newbie, is that I have bought all the stuff and built the cabinets... so I have to work with those drivers and find the way to make them work.

If somebody wants to help me, I can sshare the X-Over 3 filer, Xsim file, FRD and ZMA files....

Thank you again.
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Old Yesterday, 03:31 PM   #5
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It would be nice posting the FRD and ZMA files as .txt @diyAudio.
You need to change the termination (only the termination name as txt file to post here) to do that.
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Old Yesterday, 03:34 PM   #6
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At the same time post the size and volume of the speaker you envisioned, like the front baffle dimensions and depth, internal volume in liters and type of alignment (frequency for a BR)
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Old Yesterday, 03:53 PM   #7
raelman is offline raelman  Spain
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The cabinets volumes where calculated with Bassbox6.
Fountek FW200 needs about 23l CLOSED box.
Bass section is 700h x 170w x 200d all milimeters what means 23,8 liters.
Will be very very heavy damped.

I attach the FRD and ZMA files from all the drivers and the front baffle.
Sizes in milimeters.

the Zip files are RAR files in fact, but I had to rename it to be able to be uploaded.

All the stuff is at home unless Xover components since I'm getting crazy to design it.

Thank you everybody for your help.
Attached Files
File Type: pdf front.pdf (22.1 KB, 5 views)
File Type: zip FW146 FRD and ZMA.rar.zip (6.5 KB, 3 views)
File Type: zip FW200 FRD and ZMA.rar.zip (8.0 KB, 4 views)
File Type: zip XT25 FRD and ZMA.rar.zip (48.4 KB, 3 views)
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Old Yesterday, 06:09 PM   #8
Eldam is offline Eldam  France
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Why not change the Fountek Fw146 by a Scan Speak model 10 ?
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Old Yesterday, 07:07 PM   #9
Lojzek is offline Lojzek  Croatia
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raelman,

with the same values I got different results than what you posted.
This is just for the sake of a principle in general and not a solution
per se. I simulated in PCD7 by Jeff Bagby with parts as shown in
the schematic.

Since you have drivers and box already built, make the measurements
and then use frd and zma for simulation.
Attached Images
File Type: gif FR.gif (20.9 KB, 70 views)
File Type: gif IMP.gif (15.4 KB, 67 views)
File Type: png Xover1.png (33.3 KB, 61 views)
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Last edited by Lojzek; Yesterday at 07:16 PM.
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Old Yesterday, 07:21 PM   #10
raelman is offline raelman  Spain
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Your sim seems to be good. I have triespd the same sheet from Jeff baggy too, but in any case it can't smooth the mid resonance at 5khz.

Any idea?
Thanks for your simulation.
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