1BA + 1DD HIFI KBEAR Earphone: This dual driver KBEAR Lark hifi earbuds uses 1 balanced armature driver and 1 dynamic driver. 10mm composite biological diaphragm dynamic driver has better sound field energy, faster low frequency transient, and more flexible diaphragm. Customized balanced armature improved the extension, made the sound more clearer. Newest Electronic Frequency Division: Combining the advantages of DD and BA in this KBEAR Lark in ear monitor earbud headphone, this electronic frequency division gives full play to the performance advantages of each sound unit. The precise internal acoustic structure and subtle circuit optimization provide a hearty sound and color detail experience, enhancing the separation and layering of music,makes the sound in this hifi earphone more incisively and vividly.