[Aluminum housing] A modern sound was created that takes advantage of the brilliant and unique sound that is appropriate for the bright and shining impression of the aluminum base. Aluminum is highly workable, corrosion-resistant, and non-toxic, making it a very attractive material for earphone housings. Earphones with a relatively strong and lightweight aluminum housing can be enjoyed comfortably in a variety of listening environments.
[Acoustic design using vibration analysis technology] It can be said that the housing containing the driver unit is itself a vibrating body that produces sound. The optimal dynamic woofer was selected based on the analysis results of the vibration transmitted to the housing during sound playback and the physical properties of the material (propagation speed and internal loss). By applying precise tuning based on the piezo ceramic tweeter, we have succeeded in superimposing the unique character of metal materials on the unique sound of the Doublet series. Due to its physical properties, aluminum has low internal loss and is easy to resonate (vibrate), so tuning is performed using the "sound of the housing".
[Third generation VST2 piezo ceramic tweeter] The piezo ceramic tweeter developed by Ozeid Co., Ltd. has high resolution and excellent characteristics in the ultra-high frequency range of 20kHz or more, which is beyond the audible range. The third generation VST2 uses a piezo ceramic with a larger displacement, based on a ceramic material with low hysteresis (hierarchical characteristics) and excellent linearity, and has increased sensitivity in the ultra-high frequency range compared to the previous model, making it possible to reproduce a wider and more natural sound field.
[Graphene-coated diaphragm dynamic woofer] The dynamic woofer uses a graphene-coated diaphragm that is optimal for making the housing resonate in order to take advantage of the unique sound of aluminum. Graphene is light and hard due to its physical properties, so it has a high propagation speed, suppresses uneven vibrations such as rolling, and efficiently transmits vibrations to the housing. By giving thickness to the low-frequency range and making the most of the harmonic components produced by the VST, we have achieved a clear, well-balanced, all-round tone.
[Axial (coaxial) structure] Considering the high directivity of the high-frequency range output by the "third generation piezo ceramic tweeter VST2", an axial structure is adopted in which the driver unit's sound generation section to the port outlet is arranged in a straight line. By unifying the directivity of the sound emitted from each diaphragm, the effects of unintended sound reflection and diffraction are suppressed, creating a sense of unity in the sound. In order to maximize the characteristics of the DDM type driver with VST, the structure has been optimized. In addition, by driving two diaphragms with one network board, the DDM type driver can make the characteristics near the crossover frequency close to flat, and minimize the sense of separation between bands, which is a challenge for multi-way systems.
[Note] In order to improve the quality of radius products, we inspect them before shipping, update their firmware, and periodically recharge them. Therefore, there may be some products that have been temporarily opened, but they are unused and there is no problem with the quality. Thank you for your understanding.

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