The brainchild of an experienced member of the CIEM community, Bogdan Belenozhko, FiR Audio was started in 2018 with the goal of serving the professional audio community, catering to busy musicians on the road to whom IEMs are more a way of life than a consumer product.
With an initial focus on earphone maintenance equipment like the Headphone VAC and the VAC Jr. FiR audio managed to build a community of impressive clientele including Kanye West and Eric Benet. In 2019, after requests for a new line of both CIEMS and UIEMs, Bogdan, building on his years within the industry, launched the M Series, a series of professional earphones that combine the best of cutting-edge earphone technology to push the frontiers of earphone design.
With a lineup of 3 earphones geared towards different people with different niches. Customs are available, but consumers who prefer a more consistent sound can opt for the universal fit version of the M Series.
From technology to tuning to model numbers, here is your (near) ultimate cheatsheet on FiR Audio's M-Series.
FiR Audio’s Technology: Direct, Tactile, ATOM
Direct Aperture Acoustics
FiR Audio Makes use of Direct Aperture Acoustics, a system in which the IEM’s tubeless, spoutless chassis helps to manipulate sound in a variety of ways.
The Balancing Act. Neutral sound with a slight oomph to low frequencies to keep you immersed in your tunes. The M3 pays homage to the classic, balanced studio sound while pairing it with FiR’s latest technological advances. Its dedicated bass dynamic driver provides deep bass extension and palpable bass detail, while 2 balanced armatures covering the midrange and treble respectively lend balance to the sound with an excitingly energetic midrange and effortlessly detailed and sparkly highs. These drivers are implemented with FiR’s proprietary Direct Aperture design and the 3rd generation ATOM pressure release system, providing an impeccably balanced sound with a vast soundstage while helping to alleviate listener fatigue— A signature perfect for extended mixing and audiophile use.
The Mezzo Soprano, the M4 pairs beautiful vocals with well-balanced treble and bass to bringing out the definition of audiophile music. Engaging and musical tuning, the M4 pairs 4 drivers with FiR’s unique technologies to this end. Using a dynamic driver for well-extended, highly textured lows, with 3 balanced armatures covering the midrange and high frequencies, tuned for a smooth, vast and yet highly resolved sound signature. Combing FiR's Direct Aperture design and the 3rd generation ATOM pressure release system. The M4 gives the listener musical sound with an even larger soundstage and a pneumatic pressure-free listening experience suited for vocalists, keyboardists, guitarists and audiophiles.
The M5 contains an Electrostatic Tweeter, blending technicality and musicality, making it both resolved and palatable.
A showcase of the best FiR has to offer in the IEM space. The M5 sports a dynamic driver for lows, 3 balanced armatures covering the midrange and highs and a spoutless electrostatic tweeter to assist in treble reproduction, giving the M5’s signature a layer of airiness not present in its counterparts. The M5’s optimized driver count gives it its effortlessly massive sound, with clarity and extension on both ends. With the 3rd generation ATOM pressure release system to provide the M5 with a cavernous, out of head soundstage and a pressure-free listening experience that is well suited to all professional and audiophile uses.