The FIIO FD15 is built for listeners who want a more technical, refined sound without stepping into high-end price territory. It features a large 13.8mm dynamic driver that produces rich bass and clear mids, giving your music more body and presence. A specially designed W-shaped diaphragm and hybrid magnalium-DLC construction help to keep detail crisp, especially in vocals and instruments. You also get two sets of swappable nozzles to shape the sound to your taste, one tuned for clarity and treble, the other for fuller, more emotive bass. Comfort's been given just as much attention, with a 6.7-degree angled sound nozzle and ergonomic housing that fits securely. A high-purity cable made from Furukawa copper and silver-plated strands keeps the signal clean, while the twist-lock plug lets you easily switch between 3.5mm and balanced 4.4mm outputs.