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The REAL Problem of March Audio's Sointuva WG (Review, Measurements and Reinforcements with Klippel device)

They also just announced a new speaker , Ukkonen
I am really tempted to buy a pair, but then thte insert nuts long term reliability keeps me a bit on the edge, any update on the issue?
 
I am really tempted to buy a pair, but then thte insert nuts long term reliability keeps me a bit on the edge, any update on the issue?
just one data point but I have a pair of sointuva without any issue as far as I can tell. I am told by March Audio that a thread locking compound is used and was sent measurements of the speakers from the production testing on request
 
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just one data point but I have a pair of sointuva without any issue as far as I can tell. I am told by March Audio that a thread locking compound is used and was sent measurements of the speakers from the production testing on request
that's nice, would really love to see if Alan would provide some insight on the compound being applied, you know it's sometimes a pull back to pay that much on a pair of speaker would hope it last for at least a decade
 
I'm not sure if this has been mentioned, but there is a DIY plan by the well known developer DonHighend that is quite similar to the Sointuva WG, it is called "Kaimana". I'm not affiliated in any way, just thought it might be interesting to others.
Looks like a nice project. Given the other premium parts, not clear why he did not use the Purifi passive radiators. The crossover has more parts than I like to see but does the trick.

Thanks for sharing!
 
Given the other premium parts, not clear why he did not use the Purifi passive radiators.
Thanks for having a look! You could ask him directly in his comments section, he usually replies.
 
And here is a pretty spectacular construction report by someone who actually built the Kaimana, may it inspire anyone who feels the itch to build one, too.

410979565_10226725326852214_4114076196084340284_n.jpg
 
quite nice, but then I do think the March one is more classy looking!

Agree, this one seems much bulkier than the Sointuva too. While sharing some major parts, the designs are quite different.
 
No doubt that cabinet is solid, but seems difficult to build? Looks ok though I'm not sure I prefer the q acoustics style finishing. It does make seem less bulky I suppose.
 
I really like the tight tolerance around the drivers and style but not the wood finish in the back (I simply prefer all black,just my taste).
He really seemed to know what he did (woodwise) building it .
 
Final measure data


View attachment 214853View attachment 214854View attachment 214855



There was change in bass region as above


View attachment 214856


THD reduced a lot



View attachment 214857




As well as the THD, the multitone test result of the mid - bass frequency is also improved.

Finally all of the improvements were done, and “Sointuva WG - DC speaker gallery version” was safely returned to the owner’s hands.




So, to summarize, there is a problem caused by internal resonance which is worsened as it leaks through the gaps. But this could be drastically improved with sophisticated sealing at the binding posts and insert nuts, and additional absorption at the inside of the enclosure.

Last mystery:
Why did Erin unusually not include 86dB SPL THD data to Sointuva WG’s review?


- The End -






+ 01.07.2022

Regardless of the core problem of the Sointuva WG, I want to confess my mistakes and make things right.



It is true that I had strong suspicions about Erin at the time I was fixing issues with Sointuva WG.



And already one of my friends asked Erin about this question, and Erin gave him an appropriate answer... but I didn't believe it.



A cowardly excuse... I use templates for most of my measurements while using Klippel software.

This led to strong suspicions that only certain processes were missing from his measurements.



I doubted him without exact grounds, and he made no effort to believe it.

This is very wrong.



And this has resulted in many people being suspicious of Erin.



And also this totally ruined one man's happy weekend.



It's all my responsibility and my fault for people to doubt and slander him, at least on issues related to this thread.







I apologized to he timidly, and he asked me to post this apology on ASR for everyone to see.



Its contents are as follows:






Hello, Erin.



I am the person who posted that review on ASR.



I would like to sincerely apologize to you for this.



I should have asked and wrote about the missing 86dB SPL at 1m THD data in the first place, but I didn't.



And my stupid rashness totally ruined one man's pleasant weekend.




-----





Apart from this, you have always been a great help to me.


The data you've accumulated has given me the confidence of the public as well as cross-validation of my reviews by reviewing the same speakers.



I am fully aware of the difference between my measurement data and the anechoic chamber measurement data using Klippel NFS, and it's limitations.



But despite that, the THD of the Sointuva sample I received was higher than the 96dB data you measured, a symptom not found with other speakers I've run.



So, using the Klippel DIS module(as you know), I tested the harmonic distortion of that resonant band and found that it had a maximum value at about 85dB SPL at 1m.



Coincidentally, I also found that 86dB SPL data was missing from the Sointuva WG only in your review series.



That made me suspicious of you.



Explaining all of this may sound like an excuse for my atrocities, but I think all I can do is tell the truth.



Once again, I sincerely apologize.




So do you recommend purchasing a pair?






I don't want anyone innocent to suffer because of my faults.

I was wrong. Sorry to everyone.
 
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