Final Audio



BAM air control mechanism has been developed further, and a small, simpler product has been achieved. Comprehensively reproduces the vivid atmosphere of live music.
Our special BAM (Balancing Air Movement) Mechanism, which optimizes air movement inside the housing, has pushed the evolution of earphone body design to the next level with a simpler structure and slimmer body. The result is a balanced, natural sound that reduces unwanted sibilant high-frequency sounds. The heaven Ⅳ delivers deep spatial expression and a true “live sound” atmosphere.


  • Housing : Stainless Steel Buff-polished mirror-finished
  • Driver : Balanced armature driver
  • Impedance : 16 Ω
  • Length of Cable : 1,2 m
  • Weight : 16g
  • Accesories : Carrying Case, Ear Pads (S/M/L)
  • Colors : Violet, White, Black


BAM mechanism produces bass sounds and stereo spatial interpretations

With balanced armature driver units, iron is driven to produce sound, and as such, these drivers face a number of problems, amongst which are “proving tiring to listen to”, “having sound that is subtle and beautiful, but lacking in depth and being flat” and “lacking bass interval”. At final, we decided to focus on developing technology for the reproduction of bass tones and three-dimensional space with the full-range reproduction of a theoretically unproblematic single driver unit, rather than taking things in a multiway direction. We went back to the beginning and reviewed the performance of the balanced armature driver, focusing our attention on something we had previously overlooked ? airflow inside the housing. We developed BAM (Balancing Air Movement), a mechanism that optimizes airflow inside the housing through the creation of an aperture in the driver unit, which is usually sealed.

While achieving bass tones and deep, three-dimensional spatial representation, which proved difficult with single driver full-range reproduction, we achieved a BA type that at the same time made for natural listening the user doesn’t tire of.

An original balanced armature driver unit with an aperture that is optimized for the BAM mechanism.
Using BAM, which optimizes airflow in the housing, this driver unit has been developed to our own specifications and has an aperture arranged on the back of the driver unit, which is usually sealed.
A highly rigid stainless steel housing machined with the utmost precision for a new BAM type
The housing, which has been machined from stainless steel, appears simple at first. But the inside has been precision machined. To achieve the new BAM mechanism, it was necessary that the precision with which the housing was machined be higher than usual. This paid off; it was possible to make the internal structure simpler than it was previously, and the effect of the new BAM has been shown across all bands. We succeeded in suppressing the bracing high tones typical of balanced armature types without sacrificing clarity. The sound quality, with its three-dimensional spatial representation and sense of speed is the same as before, and a natural sound quality you don’t tire of listening to has also been achieved.

Additional Information

Weight 1 kg