FH3

Tonal Profile

A hybrid: 10 mm beryllium-plated dynamic for bass, Knowles ED30262 for mids, Knowles RAD33518 for treble. Filed as Dynamic. FiiO names the armature part numbers, which is unusual and lets you look up their own impedance curves.

Amplification Warning

114 dB/mW at 24 Ω is roughly 130 dB/V. Two Knowles armatures behind a passive crossover make the impedance curve uneven, so a source above about 3 Ω of output impedance will shift the balance between the dynamic woofer and the armatures.