Anthony from AudioDiscourse.com did a great write-up
The legacy series takes the most trusted and established knowledge and designs available in the industry, and presents them in a refreshing and refined manner.
The Thieaudio Legacy 3 was designed to provide an affordable in-ear monitor that would take no cuts in build or audio quality. While the Legacy 3 is an entry model into the Legacy series, its sound is the culmination of all of our skills and knowledge until now, and it falls nothing short of top of its class. In approaching the tuning of the Legacy 3, it had to be balanced and audiophile-grade in order to meet the Legacy series’ standards
The proprietary 10mm Nano-Membrane dynamic diaphragm driver used in the Legacy 3 is the same high-quality driver as that of its older brother, the Legacy 9. The result is a coherent treble response that extends far, retrieves every detail, yet lacks any unnecessary dips or peaks. The resulting tuning is extremely balanced, with a powerful bass, slightly warm but clean mids, and detailed, yet coherent trebles. We could not be more proud of the Legacy 3’s sound, and for this reason, we believe it is a solid foundation for the Legacy lineup.
For the Legacy 3, we decided to go with a custom mechanical watch faceplate design. Each Legacy 3 is hand built from medical grade resin, and actual watch components are arranged by hand on the faceplate, before being sealed with resin. The result is an extremely detailed and elegant look, one that is different for every Legacy 3. Each earpiece takes almost an entire day to build, and the outcome is something that no mass produced product can ever achieve
The Legacy 3 was paired with a custom 7N 8-core OCC copper cable made specifically for the Legacy 3. We chose copper as it emphasizes the smooth and warm characteristic of the IEM, bringing to life the detail and texture within the sound. You won’t have to worry about buying any other cable for the Legacy 3.