From the Final website:
We think you will be surprised not only by the clarity and vividness, but also by the sense of realism imbued in the sound produced by these headphones, something that hasn’t been experienced in headphones until now. The 50 mm diameter driver unit with titanium diaphragm is integrated with the front plate and has been machined from pure aluminum. The principal parts are composed of machined aluminum and stainless steel. It was necessary to create the housing from a rigid metal so as to achieve the sense of realism. This is a resolute prestige model, the zenith of the SONOROUS series.
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