The FiiO JT3 is a promising open-back dynamic over-ear headphone. It combines high-quality technology with thoughtful design. Equipped with a 50mm dynamic driver and a PEK+PU composite diaphragm, it delivers detailed sound reproduction with prominent bass, clear mids, and finely resolved highs. The diaphragm combines the rigidity of PEK with the flexibility of PU, resulting in a precise, distortion-free sound profile. This is supported by a TIL voice coil and a lightweight, conductive CCAW diaphragm. High-performance N52 magnets ensure dynamics and quick response. The open design, combined with angled drivers, creates an airy, natural soundstage and enhances spatial localization. The velvet ear cushions with memory foam are removable and washable, providing high comfort. The stainless steel and zinc headband with a ball-bearing sliding mechanism allows for precise size adjustment. Weighing around 330 grams, the comfort remains intact even over extended periods. The connections consist of two 3.5mm jacks on the headphone side, facilitating the use of alternative or balanced cables. The included detachable cable with a 3.5mm plug is made of palladium-coated, oxygen-free copper and is equipped with a microphone for phone calls or gaming. A 6.3mm adapter expands compatibility with stationary HiFi components. The open aluminum-magnesium mesh structure completes the acoustically and visually coherent overall concept. Thanks to the angled drivers, optimized sound guidance directly to the ear canal is achieved. This combination of material choice, technology, and functionality underscores the audiophile aspirations of the headphones. The JT3 illustrates how sound precision, wearing comfort, and high-quality materials can harmoniously come together.