Fiio FA7S is a successor to FA7 that came out back in 2019. The FA7S brings several upgrades over the FA7 such as six BA configurations on each side instead of four, 3rd generation industrial-grade design, high-purity cable with swappable termination plugs, FA7S is more comparable to the FA9 multi-BA flagship in the FA lineup of FiiO.
FiiO has equipped the latest FA7S with six high-performance balanced armature driver units. They have chosen high-quality Knowles BA drivers. The pair utilizes Knowles HODVTEC-31618 Bass set for the lows. The high-frequency is produced by the RAD-33518*2 Knowles treble driver set. For the midrange, Knowles developed a custom driver set for the FA7S.
FA7S has a three-way frequency crossover with 2 balanced armature drivers assigned for a specific frequency range. Each frequency range takes two different drivers that are designed and arranged in an electronic and physical crossover.
The FA7S is made out of medical-grade 316L stainless steel material using a powder metallurgy process. It adopts FiiO’s 3rd generation industrial-grade design. The pair undergo multiple processes such as 1000°c of high temp sintering after injection moulding. The rear cavity here is hand-polished for a shiny, mirror-like finish. The faceplate here is made using a five-axis CNC machining process. FA7S earpieces go through a PVD electroplated coating for improved rigidity.
FiiO FA7S has a high-purity silver-plated monocrystalline copper cable as its stock cable. The cable consists of 8 strands of 19 wires each collectively making a 152 wire cable. Each wire here is individually isolated and braided together in a Litz pattern. It has environmental-friendly TPU outer sheathing for a soft feel and removes any microphonic issues. The cable has angled MMCX connectors for easy connectivity. It has swappable termination plugs with FiiO’s newly developed Twist-Lock technology.