7. How does its appearance structure improve the sound performance? (The small hole on the front cavity and the volcanic field system)

[The advantage of the small hole on the front cavity]
1. The small hole of the front cavity is used to relieve air pressure. It can help to moderate pressure that happen to the ear canal when putting the FDX inside the ears. If the front hole is blocked, it would enhance the bass performance. However, hearing fatigue would also be caused easily due to increasing pressures in the ear canal.
2. The dynamic driver diaphragm of the FDX used beryllium-coated DLC. Therefore, if the front pressure-relief hole is blocked, it would possibly lead to transformation to the beryllium-plated diaphragm and thus bring abnormality to the sound performance. 

[The advantage of the volcanic field system]
The volcanic field system is an anti-standing wave structure we designed for the rear cavity of the FDX. By reversely preventing harmful standing waves, it plays an important role in enhancing bass diffusion at the rear cavity, reducing standing waves and distortion, thus achieving clearer sound.

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