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FIDUE SIRIUS A91 Hybrid Five Drivers IEM Earphones with Replaceable Cable

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  • 5-way hybrid IEM with four custom made premium armature drivers and single dynamic driver

  • Excellent divider and 3D acoustic chamber design

  • Full Metal Shells, combined with 4th generation MMCX locking mechanism

  • Braided, 8 core, silver plated, ultra-low internal resistance balanced cable and 4th generation MMCX connector

  • Accurate reference class sound with superior imaging and wide frequency range

FIDUE SIRIUS A91 Hybrid Five Drivers IEM Earphones with Replaceable Cable

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Equipped with a 5-way hybrid driver combination, including four custom-made rremium armature drivers plus one exclusive dynamic driver, the FIDUE SIRIUS A91 IEM offers reference-class sound with outstandingly accurate and detailed imaging.

As the Flagship model of the FIDUE range, the SIRIUS A91 uses four custom made balanced armature drivers along with a custom built super bass dynamic driver unit. This unique design results in a superbly detailed, accurate and neutral repodruction with clear and enhanced trebles while the custom made dynamic driver adds great warmth in the low frequency spectrum without any distortion. The detachable cable is an 8 core, silver plated, ultra-low Internal resistance audiophile balanced cable, with FIDUE's 4th generation MMCX locking design.

With beautifully sculpted full metal shells with a striking, finned design. A selection of single, dual-flanged silicone and foam eartips provide a snug fit and excellent noise isolation for unparalleled comfort even in long listening sessions.

Combining technologies for the pursuit of perfect sound.


Fidue A91



  • Drivers: Single Exclusive Super Bass 10mm Dynamic Driver / Four Custom-Made Balanced Armature Drivers
  • Frequency Range: 4Hz - 45kHz
  • Impedance: 20Ω
  • Sensitivity: 113dB
  • Max Input Power: 30mW
  • Distortion: <1%
  • Plugs: 2.5mm/3.5mm Balanced and 3.5mm stereo, Rhodium plated
  • Main Cable: 1.3m
  • Conversion cables: 0.18m



  • 5 Way Hybrid IEM, combining four custom made premium armature drivers and an exclusive single dynamic driver
  • Full metal shells and MMCX locking mechanism
  • Braided,8 core, silver plated, ultra-low internal resistance audiophile balanced cable and 4th generation MMCX connector
  • Includes 2.5mm/3.5mm balanced jacks as well as 3.5mm stereo Rhodium plated jack plug
  • Reference class, outstandingly accurate sound and excellent imaging



  • FIDUE SIRIUS A91 Reference Class 5-Way Hybid In Ear Monitor
  • Silicone eartips (XS/S/M/L)
  • Cleaning tool / disassembling tool
  • Comply foam tips (M)
  • Flight adaptor
  • 6.35mm stereo jack adaptor
  • Luxury aluminium carrying case
Product TypeEarphones
Feature KeywordComfortable, Ear Canal, Hi-Fi, IEM, In Ear, Monitor, Noise Isolation, Professional, Studio
Recommended UseDigital audio player, Hi-Fi, Portable audio system
Manufacturer Warranty1 Year
Included AccessoriesSilicone eartips (XS/S/M/L), Comply foam tips (M), Flight adaptor, 6.35mm stereo jack adaptor, Luxury aluminium carrying case, Cleaning Tool
Part NumberA91
Headphone Fit TypeIn-Ear
Headphones TypeHeadphones - binaural
Cable EntryN/A
Cable Length1.3m
Connector AngleStraight
Connector TypeHeadphones (3.5 mm stereo jack)
Detachable CableYes
Driver Size10mm
Driver TypeHybrid
Connectivity TechnologyWired
Earcup DesignN/A
Frequency Response9Hz - 31kHz
Headphones Form FactorIn-Ear
Headphones TechnologyHybrid
Number of DriversFive Drivers
Sound Isolation (dB)No
Sound Output ModeStereo
Smartphone CompatibilityN/A
Smartphone ControlsNo
Total Harmonic Distortion (THD)<1%
Wireless TechnologyN/A

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Customer Reviews

Brilliant earphones
by SteveH on 18/10/2017
The video review of the A91 on hifiheadphones website is absolutely accurate - the earphones are brilliantly constructed and have outstanding sound quality. Used with the Comply tips supplied they are a comfortable and secure fit, providing excellent bass depth. Packaging, presentation and accessories (including a range of other tips) are also excellent. The review at - virtually 9/10 - is also helpful and confirms the A91's top of the range status.

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