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Seas A26 Kit - Modelled in XSim
Seas A26 Kit - Modelled in XSim
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Old 22nd August 2017, 05:06 PM   #61
eriksquires is offline eriksquires  United States
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Hi EaZy,

Use SPLCopy or something similar to convert the manufacturer's SPL and impedance plots to FRD and ZMA files, respectively. You will usually also need something to add a phase angle to the ZMA plots, which I don't right now remember.

Once this is done, take the tweeter and import your new files.

Best,

E
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Old 22nd August 2017, 05:36 PM   #62
eriksquires is offline eriksquires  United States
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Here is my blog posting about the best uses of a Zobel:

A Speaker Maker's Journey: Crossover Basics - The Zobel

Best,

E
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Old 22nd August 2017, 07:14 PM   #63
anji12305 is offline anji12305  United States
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Quote:
Originally Posted by eriksquires View Post
Here is my blog posting about the best uses of a Zobel:

A Speaker Maker's Journey: Crossover Basics - The Zobel

Best,

E
Kudos on the heavy lifting.
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Old 23rd August 2017, 02:35 PM   #64
EaZy is offline EaZy  France
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So I finally found the frd and zma files for my 27TBFC/G tweeter and just have played with XSIM to compare it with the A26 stock kit.

Here is a simulation of the A26 as sold as a kit with the T35 exotic tweeter :
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I first have a question regarding the voice coil resistance and inductance, shouldn't we take them in account in the simulations?
On the graph below I made one simulation with and without them (the light blue curve is the model which does not take them into account, the dark blue take these values into account) :
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Then I found out that my crossover seems really to dampen way too much the high frequencies (blue curve):
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A good balance would a be obtained according to the simulation without any resistor on the tweeter.
However I tried many combinations in real life and can tell you that any resistor in series with my tweeter with a value below 8 ohms or above 12 ohms makes the system really inaudibe.

Finally an almost flat frequency response could be attained using the filter below :
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Or modifying the sensitivity of the speakers (lowering the woofer or increasing the tweeter by 5 dB)
What do you think about it? What is the cause of such a discrepancy betwen the simulation and the actual speakers I have at home?

Last edited by EaZy; 23rd August 2017 at 02:46 PM.
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Old 23rd August 2017, 05:37 PM   #65
eriksquires is offline eriksquires  United States
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Um, the very first thing I think you should do is understand Ohm's law. Your understanding of resistors is incomplete and this will help you understand what the other parts are doing.

When you are done with that, read this:

A Speaker Maker's Journey: Crossover Basics - Impedance

And then read this:

A Speaker Maker's Journey: Crossover Basics - Driver Response

And finally this:

A Speaker Maker's Journey: Crossover Basics - The Zobel

Best,


E
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Old 23rd August 2017, 09:02 PM   #66
bwaslo is offline bwaslo  United States
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Seas A26 Kit - Modelled in XSim
Voice coil resistance and inductance are already accounted for in their impedance curves and frequency response (FRD) data, you shouldn't add them in again.
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Old 23rd August 2017, 10:24 PM   #67
EaZy is offline EaZy  France
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Quote:
Originally Posted by eriksquires View Post
Um, the very first thing I think you should do is understand Ohm's law. Your understanding of resistors is incomplete and this will help you understand what the other parts are doing.
E
What makes you say that eriksquires? (no offense, but I think I used this law more than you think during my physics studies, so maybe you don't need to start with such a condescending attitude towards someone you don't know).
I just want to get an appropriate answer from a experimented person on a very applied situation.
Thanks for the links however, I started reading it and find it is quite interesting.

Bwasio, thanks for your clear answer on my first question.
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Old 24th August 2017, 01:47 PM   #68
EaZy is offline EaZy  France
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OK I just started a new thread for my speakers not to pollute this one.
It explores the 27TBFC/G as a much cheaper and serious concurrent to the T35.
See here : A26 w/ 27TBFC/G thread
Thanks for helping me in improving my filter if possible!
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Old 24th August 2017, 09:28 PM   #69
Lojzek is offline Lojzek  Croatia
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As agreed with Erik, I have completed the data files of post #2 with phase angle that's contained in the zipped file. This is the sim of the original Seas A26 kit units. To fit one's own taste, tweeter padding can be easily modified.
Attached Images
File Type: jpg Filter.jpg (47.6 KB, 289 views)
File Type: jpg FR.jpg (150.8 KB, 191 views)
File Type: jpg IMP.jpg (144.5 KB, 168 views)
Attached Files
File Type: zip A26+phase.zip (19.2 KB, 22 views)
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Old 24th August 2017, 09:49 PM   #70
eriksquires is offline eriksquires  United States
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Lojzek means, he was kind enough to take my dirty work and clean it up.

Thank you very much! I hope this helps future A26 investigators, modders and hobbyists.

Best,

E
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