The FiiO FH15 caters to a wide audience with its tuning. The detailed, vibrant sound of the FH15, featuring prominent vocals and a balanced tuning of bass, mids, and treble, brings joy across all music styles. The hybrid acoustic design of the FiiO FH15, with four drivers per side – three Knowles Balanced Armature drivers plus one dynamic driver – maximizes performance across all frequency ranges. The dynamic driver delivers rich, driving bass. The three Balanced Armature drivers from Knowles provide natural musical vocals, detailed highs, and a realistic soundstage. An extra boost comes from FiiO's patented S.TURBO acoustic design, which gives the FH15 particularly deep and nuanced bass. Since sound preferences vary, FiiO includes three pairs of sound filters with the FH15 that can be swapped out. This allows you to get the best out of the earphones according to your individual needs: whether you prioritize powerful bass, particularly detailed highs, or a balanced, transparent sound, you can use the corresponding sound filter. The ear tips also have a significant impact on sound quality. Therefore, with the FH15, you receive 16 pairs of ear tips with different sound signatures and in various sizes and shapes. A robust hard-shell case is also included, ensuring that the FiiO FH15 and all its accessories are securely stored. The high-quality earphone cable is detachable and features interchangeable 3.5 mm and 4.4 mm connectors.