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Seas A26 Kit - Modelled in XSim
Seas A26 Kit - Modelled in XSim
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Old 14th October 2016, 05:57 PM   #1
eriksquires is offline eriksquires  United States
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Default Seas A26 Kit - Modelled in XSim

Hi Everyone,

Just wanted to share an XSim model of the A26. It's reasonably accurate, but the raw driver data comes from images, so the impedance is pretty ragged.

Anyway, I though it might be a good reference in case anyone was curious, or a newbie wanted to play around with XSim or what not.

Best,


Erik
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Old 14th October 2016, 05:59 PM   #2
eriksquires is offline eriksquires  United States
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Forgot to attach the files.

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

Best,

Erik

Seas A26 Kit - Modelled in XSim-combined_fr-jpg
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File Type: jpg Combined_FR.jpg (135.9 KB, 2497 views)
Attached Files
File Type: zip A26.zip (8.0 KB, 63 views)
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Old 14th October 2016, 07:02 PM   #3
Eldam is offline Eldam  France
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Hi,

but what are the 30,60,90 curves.... a 25 cm cone Sd means it beginns to be not pistonic around 1 000 Hz and start beaming jut a little above !

Maybe we could expect than a little 3 db dip off axis la BBC study between 1 000 and 2 000 Hz is liked ?

Erik, did you ever listened this Kit ?

Aha, Troels would be flaten the impedance curve around the XO points as he did for the Proac D15 .... and maybe uses an AUDAX 35 mm driver... without the 10 ohm resistor in serie !

The four layers voice coils of the A26 driver certainly makes not the best drivers unit around, no ?

Last edited by Eldam; 14th October 2016 at 07:23 PM.
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Old 14th October 2016, 10:51 PM   #4
eriksquires is offline eriksquires  United States
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Hi Eldam

Im just posting work I did for fans. Im not recommendong the kit. If you want more data I suggest you make one yourself and post it here.

Erik
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Old 15th October 2016, 10:56 AM   #5
Eldam is offline Eldam  France
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Hi Erik,

Calm down please. I'm not critising you or your work (and here the SEAS worl as well) but just imputed one can't judge an XO on axis.

regards
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Old 15th October 2016, 03:32 PM   #6
Lojzek is offline Lojzek  Croatia
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Default Quick improvement by adding 0.68 mH as a 2nd order to the tweeter

Significantly better tweeter power handling, on-axis response,
driver phase still being ok. The XO point is pretty much defined
by the woofer's LP response, the only issue left being the tweeter's
HP and padding.
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Old 15th October 2016, 04:34 PM   #7
eriksquires is offline eriksquires  United States
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Lojzek,

That's the kind of fun I hoped DIY'ers would have with it. :-)

Best,

Erik
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Old 15th October 2016, 06:31 PM   #8
Lojzek is offline Lojzek  Croatia
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Howdy Erik,

your selection is just the right kind for novice builders. It has very decent
bass capabilities and is simple enough to execute. A vintage style loudspeaker
of the 70's.
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Old 15th October 2016, 06:46 PM   #9
eriksquires is offline eriksquires  United States
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Lojzek,

Thank you! I have been posting on various forums links to the XSim files for the LM-1 too, I hope they become useful tools for many newbies.

Best,

Erik
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Old 15th October 2016, 07:32 PM   #10
eriksquires is offline eriksquires  United States
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So the acoustic distance used for the woofer was estimated based on the published FR of the completed kit and interferometry. In other words I moved the distance until my model matched the published FR. It's easily possible I made a mistake.

Still, I like Lojzek's approach a great deal. I had tried to get fancy, by doing a 2nd order low pass and high pass filters, and that just went belly up. Lojzek's idea to just add a coil is pretty masterful.

So, adding an 0.91 mH coil I get to nearly perfect phase matching at the Xover point, but not the most symmetrical inverted response. However, as noted, this is just in simulation. The actual acoustic distance needs to be known.

Best,


Erik
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