FIDUE A91 aka SIRIUS is a reference class 5-way hybrid In-Ear Monitor with 5 drivers on each side consisting of 4 customized armature drivers for high resolution for instruments and vocal reproduction in which you will get Ultra Treble, Treble, Mids and Mid-bass and exclusive dynamic driver for fantastic bass power and extension. FIDUE has build up individual space for every driver with 3D analysis technology in its each shell which is also known as Accurate 3D Acoustic Chambers. FIDUE has merged the sound of all the 5 drivers as one using Accurate Full-range Divider Tuning technology. FIDUE has not forgotten the cable too with 8-core Silver-plated OFC Audiophile Balanced Cable which provides Ultra-low Internal Resistance and Ultra-high Transmission for Audio Signals. This time, FIDUE has taken extreme care so that none of the parts gets overlooked so FIDUE has given native 4-pin Balanced Durable Rhodium-plated plugs that only used in Hi-End Equipments. Each shell of A91 (SIRIUS) is designed using full-metal jacket with high precision CNC cutting seemless Assembling technology. There is now a 4th generation MMCX Lock-Up Design MMCX cable which is more robust in the connection.