The FA7 is the first mass-produced 3D printed quad balanced armature in-ear monitor which results in remarkably consistent sound between pairs of FA7’s as well as reduced sonic resonances that allow the music to flow through unimpeded. The shell of the FA7 is made with German high-transparency resin specifically medically designed for ears and with EU IIA medical certification which is both comfortable and antimicrobial while also being extremely durable and resistant to discolouration. Unlike traditional manufacturing processes with its inherent constraints 3D printing allows us to fully realize our goals of creating an IEM that is both pleasant to wear and maximizes sound quality through an acoustic-optimized shell design. In each FA7 ear unit are 4 Knowles BA drivers. Bass is handled with aplomb by the CI-22955 mids are provided by the classic and proven ED-29689 and treble is produced by the dual-BA SWFK-31736 driver. MMCX connector The standard FA7 cable is made of high-purity monocrystalline copper-plated silver wire and is also detachable and replaceable with an MMCX design. Specifications Driver: 4BA Speaker impedance: 23 Ω Frequency response range: 20 Hz-40k Hz Sensitivity: 110dB/mW Type of plug: 3.5mm gold-plated plug MMCX detachable cable Cable length: 120cm Single weight: 5.3g