What about the BASS performance of the FiiO FF3?
The earbuds have the natural advantage of a good soundstage, but they also have the disadvantage of not soundproofing, so the bass are easy to be leaked. In order to enhance the bass extension, the FF3 adopts the design of acoustic flute, which makes the bass more solid. At the same time, in order to obtain a better bass effect, it is recommended that you use the sponge covers.