Letshuoer DZ4

The reviewer finds the Letshuoer DZ4's stock tuning severely flawed due to a poorly implemented passive radiator that adds distortion, especially in the upper mids and treble, making it sound chaotic for genres like metal. However, he discovers that removing the passive radiator and sealing the vent dramatically improves the sound, bringing it closer to better-performing sets like the Galileo and Hexa. He advises against buying it in stock form but suggests a simple DIY modification for current owners.

The reviewer finds the Letshuoer DZ4 to be a well-tuned IEM on paper, with a vocal-forward sound and excellent build quality, but notes that the bass lacks impact and the treble has a slight grit. He prefers the cheaper Moondrop Lan for its more cohesive sound and better bass physicality, ultimately giving the DZ4 a 3-star rating as an average pick.

The reviewer finds the Letshuoer DZ4's design and passive radiator interesting but criticizes its sound quality, describing it as dark, with forward and honky mids, lacking treble sparkle and air. They conclude it is not worth the price and cannot recommend it, especially compared to cheaper alternatives.

The reviewer praises the Letshuoer DZ4 as an excellent vocal-focused IEM, noting its powerful, natural, and immersive vocal presentation that outperforms competitors for that purpose, though it lacks some treble extension and separation in busy tracks. The overall verdict is positive, with the DZ4 receiving an 'A' for vocals and an 'S-' for tonality, while technicalities are rated 'B+'.

The reviewer finds the Letshuoer DZ4 to be a well-built, comfortable, and impressively tuned IEM with strong midrange presence and surprisingly impactful bass. They note minor personal preferences for more treble air and bass, but overall consider it a solid buy, especially around the $100 price point, with good performance across various music genres.