The Fiio FT15 is the latest update to the popular Fiio FT5 headphones, offering improved performance and design at a slightly higher price. The FT15 are open-back headphones, meaning they allow more airflow around the drivers, which typically results in a more natural and spacious sound. They follow the success of the FT5, which was released in 2024 and received top marks in reviews for its sound quality and value. The FT15 now cost $499 in the US and £499 in the UK (around AU$999 in Australia), compared to the FT5's more affordable price of $449 / £429 / AU$799. One of the most significant upgrades in the FT15 is the larger 101mm driver, which is bigger than the 90mm driver in the FT5. Fiio also claims the driver is significantly thinner — 800 nanometers, which is 86.7% thinner than the previous model — and features a "full-face diamond coating" to enhance stiffness and improve sound clarity. In addition to the driver upgrades, the FT15 are lighter overall, weighing 425g, which is 31g less than the FT5. This weight reduction is achieved through the use of a carbon fiber headband and natural wood earcups, which also contribute to the headphones' premium look and feel. The FT15 come with multiple pairs of earpads, allowing users to customize comfort and sound characteristics. They also include a variety of adaptors for different audio connections, including 4.4mm, 6.35mm, and XLR-4, making them compatible with a wide range of high-fidelity audio systems. The headphones have a sensitivity of 95dB/mW and an impedance of 24 ohms, which Fiio says makes them versatile for use with various devices such as dongles, digital audio players (DAPs), amplifiers, and CD players. This includes support for smaller, portable devices that don’t require external power, offering greater flexibility for different listening setups. Fiio has clearly aimed to refine the FT5's already strong foundation with the FT15, focusing on both sound quality and user experience. The combination of larger drivers, a lighter build, and greater connectivity options makes the FT15 a compelling upgrade for audiophiles and casual listeners alike. While the price has increased, the improvements in performance and design may justify the cost for those seeking high-quality open-back headphones.