>Powerful 12mm Dynamic Driver With DLC Diamond Diaphragm.
>Strong 1.5T Magnetic Flux.
>6-Series Aluminum-Magnesium Alloy Cavities.
>Front Cavity Acoustic Prism Design.
>FiiO’s Patented Air Pressure Relief Technology With Semi-Open Rear Cavity Design.
>Interchangeable Ear Nozzle.
>Interchangeable termination plugs in FD3 Pro cable.
>Standard MMCX Connectors(MMCX assist tool included in the package).
>Frequency Response: 10Hz-40kHz.
>Weight(Per unit): about 7 grams(excluding cable).
FiiO has introduced two new additions to their "FD" series of single-Dynamic IEMs, the brand-new FiiO FD3, and FD3 Pro. FiiO has developed a new 12mm dynamic driver unit with a DLC Diamond diaphragm that delivers a powerful performance with both the FD3 and FD3 Pro. They have featured patented Pressure Air-Relief technology with a semi-open rear cavity design. The front cavity has a premium acoustic prism technology that helps in maintaining a proper phase in the output signal.