If you are accustomed to earphones in the current price range, then you may find this pair of earphones quite different and initially perceive a strong sense of disorder in its sound, but not necessarily unpleasant. Considering it is a single dynamic driver, it's best to give it a few days of "burn-in" before making a judgment. After the initial usage, the HDB has a certain demand for power, but it's not difficult to drive. Its quality itself does not fall behind when compared to other earphones in the same price range. In terms of tuning, it seems to have the unique considerations of the brand, which reminds me of Final's B1, although they are entirely different. You can't evaluate it using the conventional framework of tri-frequency balance, soundstage, layering, or dynamic transients, but you genuinely feel that this pair of earphones sounds quite good. Gentle yet not overly flattering, spacious yet not empty, warm and smooth but not overly heavy. In short, the HDB can instantly dispel my restrictive thinking that "current earphone tunings are all the same," and serves as a device that allows one to "forget about quality and return to the music."

--------------- Click here for detailed post (originally in Chinese) ---------------