Fidue Sirius A91 Reference-Class 4BA+Dynamic 5-way Hybrid In-ear Monitor earphone

SKU: Fidue-A91
Price: US$899.98
In Stock - Shipping within 48 hours Worldwide Free Shipping
  • 4 Customization-Class Hi-End Balanced Amarture driver.
  • 1 customized bass dynamic driver.
  • Delicate 3D acoustic cavity coil design.
  • Lower internal resistance 8 cores silver plating balance cable.



5-way hybrid driving technology

  • Customization-Class integration of moving iron and automatic moving coil

4 Customization-Class Hi-End Balanced Amarture driver

  • The high-definition resolution power shows you lively instruments and voices.

1 customized bass dynamic driver

  • Surpass the conventional bass diving ability.
  • Make music full and extend, grand and magnificent.

Delicate 3D acoustic cavity coil design

  • Create suitable voice space for the voice attributes of every unit by means of delicate 3D analysis technics

Delicate full-frequency fractional frequency tuning

  • Make 5 high-quality drivers with different attributes combine perfectly.

Lower internal resistance 8 cores silver plating balance cable

  • Compared with most earphones with 4 cores or 3 cores wire rod, it doubles the wire rod. As great reduction of the internal resistance of wire rod, the signal becomes more clear and prompt.

Orginal 2.5mm quadrupole balanced designed plug

  • Protogenously equipped with 3.5mm balance convert cable and stereo universal cable

Tougher all-metal shell

  • High precise CNC incision and rigorous assembly technique make Sirius utterly natural.

The fourth generation MMCX locking design

  • The special made stainless steel structure makes the connection of MMCX more stable and durable.

Excellent wearing design to be more supra-aural

  • More than a hundred of experiments and adjustments only for better fit auricle and excellently isolate noise.

More stable over-ear-style sport wearing

  • No matter in stage, train, gym or street, you can absorb in your music.

Music flame,completely display

  • Sirius, its every design is deliberate, and every part is carefully considered. Just because every detail will affect the excellent performance of sound quality and wearing. The pursuit of delicacy, the painstaking research and consideration about 700 days make the right product.


  • Color: Dark Grey
  • Driving Units: 4 Balanced Amarture driver & 1 dynamic driver
  • Frequency Response: 4-45000 Hz
  • Impedance: 20Ω
  • Sensitivity: 113Db
  • Input Power: 30mW
  • Total Harmonic Distortion: <1%
  • Plug: Protogenous 2.5mm balance stereo rhodium plating plug
  • Cable Length: 1.3m 8cores silver plating OFC audiophile cable
  • Converting Cable: 2.5 to 3.5mm quadrupole balance converting plug; 2.5 to 3.5 mm universal stereo converting plug
  • Applicable products: iphone, Samsung, HTC, Xiaomi, Meizu(all models), Ipad (Tablet&PC). It applies to 99% market electronic products


  • Fidue Sirius A91 earphone
  • Monolayer silicone case x 4
  • Comply T500 memory sponge cover x1 pair
  • Holder belt x1
  • Disassemble kit x1
  • Clean kit x1
  • Tailor-made aluminum alloy housing case x1
  • Aviation stereo plug x1
  • 3.5 to 6.3 stereo converter x1

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