Over many years, Sony has joined together with people who work in professional production studios,
and using their feedback has crafted superior headphones that meet their high expectations. One of the
most important elements among those expectations is accurate sound. In order to allow the wearer to
enjoy that sound in an outdoor environment, these headphones have passed through a development
stage that pursued perfection in functionality and performance. To provide accurate sound and a fit
designed for outdoor usage and portability without compromise, they are packed with technology that
Sony has accumulated to date as well as Sony’s own cutting edge technology. This pamphlet explains
these technological components.
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1. For high sound quality
Rich bass and expansive treble:
Large caliber 16 mm diameter dynamic-type driver unit
In the closed-body-type in-ear headphones, a large caliber dynamic driver unit that is the largest in the
industry at 16 mm diameter was used. It enables a wide dynamic range available only with a dynamic
driver unit and playback of a broad range of sound, providing a clear and accurate sound with
incredible balance from the bass to treble range.
Driver unit size comparison
9 mm driver unit13.5 mm driver unit16 mm driver unit
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Suppressing unwanted vibrations and providing high resolution sound playback:
Liquid Crystal Polymer film diaphragm
For the driver unit diaphragm material, lightness and consideration to the seemingly contradictory
features of highly rigidity vs. high internal loss is essential. Though rigidity is key in accurately
converting input signals over a wide bandwidth into sound, a high level of internal loss is also required
to suppress unnecessary vibration of the diaphragm itself.
Liquid Crystal Polymer has already been identified for some time as a material that can provide a
balanced combination of these two characteristics in high order. However, previously it could not be
used to create diaphragms for headphones due to the inability of compositions and manufacturing
methods to obtain sufficient heat resistance and the inability to achieve the thinness required for usage
in headphones, caused by a low degree of film elongation and the difficulty of formation.
To solve this problem, a highly stretchable Liquid Crystal Polymer
was successfully developed for use as a casting film using polymer
varnish. This made it possible to enable both rigidity and a high level
of internal loss over a wide bandwidth, while also providing the level
of strength required to stand up to the process of creating a thin film.
In short, a material for creating the perfect diaphragm for
reproducing accurate sound was born.
Liquid Crystal Polymer filmLiquid Crystal Polymer film
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