The FiiO FH7S' hybrid acoustic design with five drivers per channel - four Knowles Balanced Armature drivers plus a dynamic driver - gets the most out of all frequency ranges. The dynamic driver provides rich, propulsive bass. The four Balanced Armature drivers, tailor-made for the FH7S, deliver natural musical voices, detailed highs and a realistic soundstage. For an extra boost, FiiO's patented S.TURBO acoustic design gives the FH7S extra deep and nuanced bass.The rounded design of the earphones is tailored to the human ear and fits snugly inside the ear cup. The FH7s are designed to be semi-open for a live concert-like sound. The grille on the earphones relieves pressure, which makes listening to music particularly fatigue-free, even over long periods of time, and gives the sound a pleasant warmth with a high level of detail and wide spatiality at the same time. Because sound tastes differ, FiiO supplies three pairs of sound filters with the FH7S (one already fitted), which can be exchanged yourself. This way, you can get the best out of the earphones for your individual needs: depending on whether you value a particularly powerful bass, specially emphasised treble or a balanced sound image, you insert the appropriate sound filter. The ear tips also have an influence on the sound of an earphone that should not be underestimated. Therefore, with the FH7S you get 19 pairs of earplugs with different sound signatures and in different sizes and shapes. A noble leather case with magnetic closure is also included so that the FiiO FH7S can be safely stored with all accessories. The high-quality earphone cable is detachable and has interchangeable 3.5 mm and 4.4 mm plugs.