FiiO FH1 Dual Driver Hybrid Over the Ear Headphones/Earphones/Earbuds In-Ear Monitors with Android Compatible Mic and Remote (Black)Hybrid Dynamic-Balanced Armature design for double the detail The FH1 adopts a hybrid design, in which the 10mm titanium diaphragm driver produces abyssal lows while the Knowles 33518 balanced armature driver provides exquisite mids and highs. These two drivers work perfectly in harmony to allow you to truly dive into a musical, yet highly detailed experience. Highly-Acclaimed Knowles 33518 driver The latest from the renown Knowles, the 33518 balanced armature, as used in the FH1 brings both a rich, yet delicate expression of music. Titanium dynamic driver for potent bass A 10mm titanium diaphragm dynamic driver is responsible for the FH1's powerful lower frequencies.