Add a pure beryllium diaphragm dynamic driver semi-open acoustic design to your ears with FiiO FD7
Editor’s brief: What’s Be and 4 at the same time? That’s right, that’s the metal Beryllium, atomic number 4 on the atomic table. It is found in the FiiO FD7 IEM (in-ear monitor), with great semi-open acoustic design, 12mm pure […]