What's this Fosi fuss? – It's the i5 [€549], an open 97mm planar-magnetic diaphragm over-ear headphone of 28Ω impedance, 550g weight and 98dB/1mW sensitivity. Magnetic drive of 44 neodymium slugs is balanced so two-sided. The sliver cup is American Walnut, the outer grill aluminium. The 150cm cable terminates 3.5mm on the headphone and 3.5mm or 4.4mm at the amplifier, the latter balanced termination for a €20 surcharge. The magnetized pads are synthetic leather, the voice coil on the 2µm diaphragm is a 3-layer 1.3µm nickel/cobalt affair surrounding pure silver applied via advanced magnetron sputtering. The cosmetic similarity with HifiMan can't be coincidental?
