Que UTG—World-first Earphones Incorporating Ultra-thin Glass Diaphragms Launched
Ultra-thin glass developed by Nippon Electric Glass Co., Ltd. (Head Office: Otsu, Shiga, Japan; President: Akira Kishimoto; “NEG”) has been adopted for the diaphragm of SIVGA's new earphones, Que UTG, which went on sale on May 23, 2025. Que UTG is the world’s first earphone product* to combine a flat diaphragm made of special glass with a dynamic (moving coil) type structure.
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According to NEG research as of June 2025, based on product information from major earphone manufacturers and articles from domestic and international specialized media.
Features of the ultra-thin glass diaphragm
Ultra-thin glass, a type of special glass, is a material with completely different functionality and properties from those of common glass used for windowpanes and glassware. The use of ultra-thin glass for the diaphragm offers the following benefits:
・ The diaphragm has a faster attack time* than that of existing materials, such as paper and metal, so the sound reaches you crisply and clearly.
・ The material itself has a low level of inherent sound characteristics (high internal loss), so its decay time* is also fast, contributing to little sound distortion.
・ Being lightweight and easy to vibrate, the diaphragm accurately reproduces delicate sound nuances.
・ The glass surface is strengthened through a special chemical treatment to withstand the intense oscillations of deep bass sounds.
・High resistance to environmental changes such as temperature and humidity reduces deterioration over time.
Ultra-thin glass has excellent properties as a diaphragm and is attracting attention from the business sector as a new material with great potential.
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The term attack time refers to the duration from the start to peak of sound level, or quickness of response. A fast attack time gives the sound better definition and crisper attack for percussion and stringed instruments. In contrast, the term decay time refers to how quickly a sound fades away after audio reproduction. A fast decay time means no unnecessary sound remains and the next sound can be heard clearly, resulting in a tighter sound with less distortion overall.
The ultra-thin glass developed by NEG, three-dimensionally molded into a diaphragm by Glass Acoustic Innovations
The glass was three-dimensionally molded by Taiwan’s Glass Acoustic Innovations Co., Ltd. (GAIT). GAIT possesses advanced technical capabilities and multiple glass diaphragm molding patents. NEG and GAIT entered into a strategic partnership in 2023.
Que UTG
Que UTG will be sold through 01Diverse Inc., SIVGA’s distributor in Japan, and is priced at JPY15,980 (tax included).
■Product Webpage
https://01diverse.jp/products/sivga-que-utg