I am not good at English. Therefore, this post was written with the translation help of many people in Korea. I am very grateful to them.
I am an audiophile publishing speaker reviews to audio communities. Currently, I am using Klippel Distortion Analyzer 2, Earthworks M30 mic, and a DIYed turntable to measure directivity(quasi-anechoic measurement) and nonlinear distortion for my reviews.
I’ve recently reviewed March Audio Sointuva WG and I’d like to report some problems I found and share some thoughts here, although I am not a native speaker of English.
In a nutshell,
1. The Sointuva WG I received turned out to have rather high levels of THD at 85dB SPL. Also, the distortion rate was lower at 95dB SPL than it was at 85dB SPL, unlike any other typical speakers in which nonlinear distortion increases proportionally as output dB increases.
2. Unusually, in Erin's Sointuva WG review, the 86dB SPL THD data seems to be missing.
There is something I would like to correct about this.
audiosciencereview.com
That's my apology to Erin, located at the bottom of the post above.
3. It has questionable build quality regarding sealing, internal wiring, non-uniform component qualities, unassembled parts, etc.
Let’s look at the details.
Below is the very first measurement data.
(I would not attach multi-tone and compression test results in order not to make it too lengthy. If you want to see them, please refer to my original review. https://gall.dcinside.com/mgallery/board/view/?id=speakers&no=243813 )
The acoustical axis used in measurement wasn’t set on the tweeter but the middle of the tweeter and woofer.
So the real problem begins here.
Some community users pointed out that my THD level at 85 dB SPL, 1m, is approximately the
same as the 96dB SPL data of Erin’s.
It was strange enough, because mine was even higher.
At this point one of the community users sent an email to March Audio about this issue, and got this reply.
Alan claimed that their quality control was seamless, But I thought further tests were needed as we already noticed some problems.
In the first place we suspected deviation between samples, and as I had only one of the pair, I asked the owner to send me the other speaker, and he kindly did so.
1. Sample A&B nearfield measurements (A is the one first measured and thought to have some issues)
In particular, the measurement results were very different at the passive radiators, so I decided to disassemble this piece (Sample A) in order to exchange the radiator (which was suspected to be defective).
I added a description to this post using the link below.
There is a lot of information missing as it is a huge task for me to compile and post this thread.
So people reading this may be confused.
Please understand.
audiosciencereview.com
I am an audiophile publishing speaker reviews to audio communities. Currently, I am using Klippel Distortion Analyzer 2, Earthworks M30 mic, and a DIYed turntable to measure directivity(quasi-anechoic measurement) and nonlinear distortion for my reviews.
I’ve recently reviewed March Audio Sointuva WG and I’d like to report some problems I found and share some thoughts here, although I am not a native speaker of English.
In a nutshell,
1. The Sointuva WG I received turned out to have rather high levels of THD at 85dB SPL. Also, the distortion rate was lower at 95dB SPL than it was at 85dB SPL, unlike any other typical speakers in which nonlinear distortion increases proportionally as output dB increases.
There is something I would like to correct about this.

The REAL Problem of March Audio's Sointuva WG (Review, Measurements and Reinforcements with Klippel device)
I am not good at English. Therefore, this post was written with the translation help of many people in Korea. I am very grateful to them. I am an audiophile publishing speaker reviews to audio communities. Currently, I am using Klippel Distortion Analyzer 2, Earthworks M30 mic, and a DIYed...

That's my apology to Erin, located at the bottom of the post above.
3. It has questionable build quality regarding sealing, internal wiring, non-uniform component qualities, unassembled parts, etc.
Let’s look at the details.
Below is the very first measurement data.
(I would not attach multi-tone and compression test results in order not to make it too lengthy. If you want to see them, please refer to my original review. https://gall.dcinside.com/mgallery/board/view/?id=speakers&no=243813 )
The acoustical axis used in measurement wasn’t set on the tweeter but the middle of the tweeter and woofer.
So the real problem begins here.
Some community users pointed out that my THD level at 85 dB SPL, 1m, is approximately the
same as the 96dB SPL data of Erin’s.
It was strange enough, because mine was even higher.
At this point one of the community users sent an email to March Audio about this issue, and got this reply.
Alan claimed that their quality control was seamless, But I thought further tests were needed as we already noticed some problems.
In the first place we suspected deviation between samples, and as I had only one of the pair, I asked the owner to send me the other speaker, and he kindly did so.
1. Sample A&B nearfield measurements (A is the one first measured and thought to have some issues)
In particular, the measurement results were very different at the passive radiators, so I decided to disassemble this piece (Sample A) in order to exchange the radiator (which was suspected to be defective).
I added a description to this post using the link below.
There is a lot of information missing as it is a huge task for me to compile and post this thread.
So people reading this may be confused.
Please understand.

The REAL Problem of March Audio's Sointuva WG (Review, Measurements and Reinforcements with Klippel device)
Most likely because they isolated the driver from the baffle with damping or mounted it via the magnet. So is it industrial standard to mount it via the magnet? That's what I'm questioning.

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