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Ocharaku, Ultimate Headphones by Sony's Legendary EngineerMy First Ocharaku Experience
First of all, I must confess that I'm a complete beginner in this field. A department manager offered me to try this to get a feedback from a "near-real" consumer perspective. And I just cannot pretend to be a skilled and experienced reviewer.Hence all I can do to make this article is as authentic as it can by repeatedly using the product and reiterate to the best I can of my true experience. . . that's why this is more of an impression than an organized review. *If you want to read great reviews on Ocharaku products, visit a brief list I compiled: Ocharaku Reviews from Audiophiles All Over The World
Okay, confession is done. Let's get on to my experience with Ocharaku.
For over 3 months, I have been listening to music using the Ocharaku headphones "Flat4-SUI Plus" during the commuting train rides (2 hours per day average). My musical preference covers various music genres, ranging from J-Pop to classical. And I've also used it to listen to podcasts and drama series.
The Devices I have been using during this endeavor are: iPhone & Huawei P9 (on the train), Desktop PC (in my room). Audio files are sourced from: CD and Apple Music.
*I must confess again that I didn't use any high-grade audio device. Please make suggestions if you would like the product to be tested on other devices.
Flat4-SUI Plus [Plug] 3.5mm Stereo Mini Plug
*Although the "Flat4-SUI Plus" is an entry level product from Ocharaku's flagship lineup - the "Flat4 series", signature technologies are applied to it just like its high-class counterparts released in the series.
I found that I am thoroughly enjoying the sounds produced by the Flat4-SUI Plus, it highlighted some details I've never been able to hear before, dramatically bringing out the hidden qualities of the original acoustic.
I would normally adjust the equalizer if I want to focus on the particular sound range, it always ends up masking the other ranges, moreover, the disturbed balance is also more than likely to produce a bland noisy sound.
However, the sound Flat4-SUI Plus produces is always balanced and pleasing at first glance (or hearing).

"SUI" faithfully replicates different tones from all frequencies in a natural way thanks to the technology developed by Ocharaku named "Twin Equalized Element System."
I was a bit skeptical in the beginning because it was the first time I came in contact with this technology and knew nothing about it and how it works. But after 3 months of use, it finally made sense to me.
Among all the different tones processed by "SUI," I especially enjoyed the low range. You can be easily identified when listening to dance music like the ones listed below.
Recommended Audio Sources for Reference
*If possible, please listen to these songs NOT on YouTube but CD or streaming service for better reference.-
CD Album FreshSly & The Family Stone1700yen
- September 24, 2008
- No longer available
-
CD Album 25 [Japan Bonus Track]Adele2490yen
- November 20, 2015
- No longer available
-
CD Maxi We Don't Need To Talk Anymore [w/ DVD, Limited Edition / Type A]w-inds.1389yen
- January 11, 2017
- No longer available
Limited Edition
Sly & The Family Stone - If You Want Me To Stay
Great bass.Adele - Hello
Great mid and high (especially vocal!)w-inds. - We Don't Need To Talk Anymore
Fine drum & bass.Flat4-SUI Plus [Plug] 3.5mm Stereo Mini Plug
Before end this article, I will list appearances of "Flat4-SUI Plus." Hope these will help your further understanding.
Ocharaku SUI Unboxing




Flat4-SUI Plus [Plug] 3.5mm Stereo Mini Plug
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