Written by Jude Mansilla ​

(Above) Sennheiser HD800S prototype with Sennheiser HDVD800. ​

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(Above) Axel Grell of Sennheiser. ​

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Here are a couple more photos of the prototype (click photos to see larger versions): ​

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EDIT 2015-10-26 0407 GMT+9 ​

(Below) Photos showing the inside of the HD800S earcups with the grille cloth removed (click photos to see larger versions): ​

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Today, at Sennheiser's exhibit at the Fall 2015 Fujiya Avic Tokyo Headphone Festival, Sennheiser quietly unveiled the upcoming Sennheiser HD 800S.The Sennheiser HD800S is a line extension, meaning the original HD800 will remain in the line, alongside the HD 800S. The retail price of the HD800S has not been announced yet (nor has the release date), but it will include two cables (standard 1/4" stereo plug and full-size 4-in XLR balanced plug). Also, the color of the HD 800S will be black, both the outer coating and the base material.Sennheiser let me borrow a pre-production HD800S for a couple of nights in my hotel room (along with a black Sennheiser HDVD800 DAC/amp), and the sense of fullness was improved, and the treble is at least as detailed as the HD800, but with undoubtedly more refinement and smoothness. In my opinion, this is a clear improvement.Axel Grell confirmed that the tuning has been changed (versus the HD 800). When I asked Axel Grell to describe the changes, he said: