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Final Sonorous IV Hybrid Driver Headphones with Detachable Cable

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  • Clear sound with a vast sound stage and powerful bass

  • Balanced armature and dynamic driver combination

  • BAM mechanism optimises air movement inside housing

  • Detachable cable with locking mechanism

  • Rigid ABS housing with matt coating

Final Sonorous IV Hybrid Driver Headphones with Detachable Cable

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Final Sonorous IV

Famed for exceeding the average, Final have fused different driver technologies in the Sonorous IV headphones to achieve clear sound with profound and deep sound stage. With the combination of dynamic and balanced armature drivers together with Final's BAM air flow mechanism, the Sonorous IV is able to deliver sonic excellence with power and balance making them suitable for high-definition audiophile listening.

This synergetic collaboration effect in the Sonorous IV of a hybrid design that merges custom made balanced armature drivers with a 50mm diameter dynamic driver unit and BAM mechanism allows the Sonorous IV to create clear, crisp bass tones and a distinct, vast soundstage with deep-reaching response.

In the Sonorous IV, Final have utilised a 3.5mm gold-plated plug with locking function for the connector on the headphones. By employing a gold-plated monaural plug with a 3.5mm diameter for the connector with a long-standing performance record, poor contact owing to deterioration is near eliminated.

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Final Sonorous IV


Balanced Armature Driver
Balanced armature driver unit developed by Final for optimal use as a tweeter. Final have paid special attention to the choice of materials used utilising a permalloy with a high level of magnetic permeability in the magnetic circuit.

Dynamic Driver
By increasing the precision of the parts, it has become possible to make the gap between the magnetic circuit, the pole piece and the yoke narrower than with common dynamic drivers. A powerful neodymium magnet achieves a high magnetic flux density, resulting in powerful and clear sound.

Balancing Air Movement
BAM technology mechanism optimises the air movement inside the housing and controls unwanted vibrations for balanced, natural sound that reduces unwanted sibilant high-frequency sounds. Sonorous IV has been tuned to an extremely accurate level based on new knowledge expertise gained from the development of Sonorous X.

Improved Earpads
To make sure fit of the Sonorous IV is superior, Final have used synthetic leather earpads, which have an equal amount of flexibility both horizontally and vertically as real leather. The foam sponge has just the right amount of flexibility, permitting the Sonorous IV to achieve clear sound with highest levels of wearing comfort and isolation.

Superior Craftsmanship
To achieve a high level of precision with the hard ABS housing, simulations were carried out until the appropriate level of fluidity with respect to the moulding material was achieved. The rough textured finish and thick aluminium backplate at the back of the driver achieves perfect air pressure balance and suppresses unnecessary vibrations.


Final Sonorous IV



  • Drivers: 50mm dynamic + Balanced Armature
  • Sensitivity: 105dB
  • Impedance: 8Ω
  • Housing: ABS thermoplastic
  • Cable length: 1.5m
  • Weight: 410g



  • Clear sound with a vast soundstage and powerful bass
  • BAM mechanism optimises the air movement inside the housing
  • Balanced armature drivers developed by Final in-house
  • Newly developed 50mm dynamic drivers
  • Earpads with optimum resilience for a comfortable fit
  • Rigid ABS housing with matt coating
  • Detachable audio cable with locking function



  • Final Sonorous IV Headphones
  • Detachable audio cable with locking mechanism 1.5m


Product TypeHeadphones
Feature KeywordClosed, Comfortable, Hi-Fi, Noise Isolation, Over Ear, Over Head
Recommended UseDigital audio player, Hi-Fi, Portable audio system
Manufacturer Warranty1 Year
Included AccessoriesDetachable audio cable with locking mechanism 1.5m
Part NumberFI-SO4BD3
Headphone Fit TypeOver Ear
Headphones TypeHeadphones - binaural
Cable EntryDual Sided
Cable Length1.5m
Connector AngleStraight
Connector TypeHeadphones (3.5 mm stereo jack)
Detachable CableYes
Driver Size50mm (Dynamic)
Driver TypeHybrid
Connectivity TechnologyWired
Earcup DesignClosed Back
Frequency ResponseNo
Headphones Form FactorOver Ear
Headphones TechnologyHybrid
Number of DriversDual Drivers
Sound Isolation (dB)No
Sound Output ModeStereo
Smartphone CompatibilityN/A
Smartphone ControlsNo
Total Harmonic Distortion (THD)No
Wireless TechnologyN/A

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