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Multi-Way Conventional loudspeakers with crossovers

Seas A26 Kit - Modelled in XSim
Seas A26 Kit - Modelled in XSim
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Old 26th August 2017, 01:12 PM   #81
GDO is offline GDO
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Sure, avoiding measurements makes life easier. Same for avoiding insane sims..
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"Fitz: I want to use an 8 inch woofer for more bass and a dipolar ribbon tweeter for sweet highs. And the enclosure should be a box with a vent, like everybody uses." S.L. Conversations with Fitz https://www.youtube.com/watch?v=59C7KZ5i42A
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Old 26th August 2017, 01:49 PM   #82
Lojzek is offline Lojzek  Croatia
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This is just one of those have fun building speakers thread with some good pointers that is supposed to help people. Calling it insane is hmm... simply wrong.
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Old 26th August 2017, 03:09 PM   #83
GDO is offline GDO
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Sharing suspicious FRD and ZMA files on the web is indeed an insane way of having fun with building speakers...
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"Fitz: I want to use an 8 inch woofer for more bass and a dipolar ribbon tweeter for sweet highs. And the enclosure should be a box with a vent, like everybody uses." S.L. Conversations with Fitz https://www.youtube.com/watch?v=59C7KZ5i42A
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Old 30th August 2017, 04:49 PM   #84
EaZy is offline EaZy  France
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Hello,
so I was very fortunate to get a nice e-mail from SEAS today , they sent me the original datas for the A26 woofer and the T35 :

Quote:
Hello,

We only have the measurements for the A26-kit: SEAS A26 Kit
You can also take a look at the attachments here.

I hope this will help you!

Med vennlig hilsen / Kind regards

SEAS Fabrikker AS
H026174_small
SEAS: The Art Of Sound Perfection
Enclosed were the .txt files that I provide here in a ZIP file. These were exactly frd and zma files, I just duplicated them to get the usable files.

There is indeed a substantial discrepancy with the datas that circulated on this forum so far, so please take care of using only these original datas in the future.

I played a little bit in XSim and it appears that a 1mH inductor in // on the tweeter makes a big improvement.

Without the inductor :
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and with the inductor :
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Strange that SEAS didn't think of adding it in the original filter!
Attached Files
File Type: txt A26_SPL.TXT (9.0 KB, 35 views)
File Type: txt A26_IMP.TXT (12.6 KB, 16 views)
File Type: txt T35N_SPL.TXT (9.2 KB, 13 views)
File Type: txt T35N_IMP.TXT (12.6 KB, 11 views)
File Type: zip FROM SEAS.zip (391.1 KB, 40 views)

Last edited by EaZy; 30th August 2017 at 04:52 PM. Reason: With original datas directly from SEAS!
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Old 30th August 2017, 06:07 PM   #85
Lojzek is offline Lojzek  Croatia
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Seas had the freedom to provide a design of their choosing, so the DIYers could improve on it.
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Old 30th August 2017, 07:04 PM   #86
roderickvd is offline roderickvd  Netherlands
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Quote:
Originally Posted by EaZy View Post
Hello,
so I was very fortunate to get a nice e-mail from SEAS today , they sent me the original datas for the A26 woofer and the T35 :

Enclosed were the .txt files that I provide here in a ZIP file. These were exactly frd and zma files, I just duplicated them to get the usable files.
Thanks for sharing! SEAS customer support has proven pretty awesome. I'll consider adding an inductor to my build and report back when I have.
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Old 30th August 2017, 10:49 PM   #87
Dissi is offline Dissi  Switzerland
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Quote:
Originally Posted by EaZy View Post
Strange that SEAS didn't think of adding it in the original filter!
The woofer of the A26 speaker actually is a bit too loud in the range from 600 to 1100 Hz. The tweeter is of opposite phase there and brings the level down by 2 dB. That's how the original works.

With an additional inductor in the tweeter filter this doesn't happen anymore and the hump at 900 Hz might become a problem.
Attached Images
File Type: jpg SimulationSeasA26.jpg (116.5 KB, 297 views)
File Type: jpg CrossoverSeasA26.jpg (32.2 KB, 299 views)
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Old 31st August 2017, 03:31 PM   #88
roderickvd is offline roderickvd  Netherlands
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True, but wouldn't you agree that the flatter response from 1 - 2,5 kHz is better overall? As well as higher sensitivity.
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Old 31st August 2017, 04:07 PM   #89
andy2 is offline andy2  United States
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Quote:
Originally Posted by eriksquires View Post
Forgot to attach the files.

Just for fun, here's the FR plot. The complete XSim file is zipped and attached.

Best,

Erik

Click the image to open in full size.
The bump at the ~1.8KHz probably will make the sound a little forward. The overall level at 2K - 4K level a little too high compared to the 200 - 300Hz so the overall sound probably could use some warmness.

Last edited by andy2; 31st August 2017 at 04:14 PM.
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Old 1st September 2017, 01:02 AM   #90
Dissi is offline Dissi  Switzerland
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Quote:
Originally Posted by roderickvd View Post
wouldn't you agree that the flatter response from 1 - 2,5 kHz is better overall?
I really don't know. It's a simple modification you can easily try. I only expect too much mids from the modification and think the original version is more balanced.
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