The FH1S adopts a sound signature that both audio enthusiasts and mainstream listeners will love. With vivid bass, clear treble, and lush vocals, the FH1S’ relatively balanced sound signature will find fans of all kinds. The FH1S’ Knowles 33518 BA driver is located near the front (closer to the ear) of the body, which reduces high-frequency sound loss and thus improves treble extension. The Knowles BA drivers plays its high frequencies through a brass sound tube, which reduces unwanted resonances and gives the higher frequencies a sense of realism and tactility you can really feel. The FH1S’ dynamic driver is made of a bio-polymer diaphragm being driven by extremely robust N50 magnets, giving you powerful yet quick bass as well as crisp and clear drums for a striking overall sound. While the large 13.6mm dynamic driver on its own provides high quality deep bass, when combined with our patented balanced pressure relief technology we unlock even more of that driver’s potential! The precisely tuned balanced pressure relief system equalizes the air pressure in the front and the back of the body, greatly enhancing the soundstage and reducing your ear’s fatigue when listening. Based on the feedback received for FiiO’s other IEMs, we have made the Fh1S even more like a custom IEM for truly excellent comfort. After going through countless iterations of different designs, we settled on a shape that more closely follows the shape of the human ear, allowing anybody to put on the FH1S more easily and wear it more comfortable for longer periods of time.
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