Discover FiR Audio Project K – a revolutionary in-ear monitor (IEM) that redefines high-end personal audio. Built with over a decade of acoustic innovation, Project K stands as FiR Audio’s flagship creation—merging sonic brilliance with elite craftsmanship.
The Project K features a 5-driver hybrid configuration, including a powerful 9mm Kinetic Bass dynamic driver and four OpenDriver balanced armature drivers tuned to deliver immersive, true-to-life sound across the full frequency spectrum. With a frequency response of 20Hz–20kHz and 15 ohms impedance, it delivers effortless clarity, deep lows, and lush mids—ideal for audiophiles, musicians, and critical listeners alike.
Project K is engineered with precision-machined titanium shells for durability and resonance control. Its stunning blue copper faceplates topped with sapphire glass exude luxury while providing enhanced structural integrity. Inside, premium silver internal wiring ensures ultra-clean signal transmission with zero compromise.
ATOM Venting System with Gold + Xs modules (customization-ready)
Sapphire glass top – combines beauty with durability
Premium white leather case – designed for audiophiles on the go
4-core coaxial cable (1.6mm OD)
Silver-plated copper inner conductors (24 strands x 0.06)
Shielding: 80 strands x 0.06 silver-plated copper
Nickel-plated connectors for durability and signal integrity
With FiR Audio Project K, you're not just listening—you’re experiencing music at its most refined. Elevate your IEM collection with a flagship that delivers next-level sound, craftsmanship, and innovation.
Driver Configuration
1x 9mm Kinetic Bass Dynamic Driver
2x OpenDriver Balanced Armature Driver for mids
1x OpenDriver Balanced Armature Driver for high-mids
1x OpenDriver Balanced Armature Driver for highs (with Sound Reflector)
Technical Specifications
Frequency Range: 20-20kHz
Impedance: 15 ohms
Cable Specifications
4core, Coaxial Structure, OD:1.6mm
Inner Conductor: 24x0.06 Silver Plated Copper
Shielding: 80x0.06 Silver Plated Copper
Nickel Plated Hardware
Warranty Period: 1 Year from the date of Invoice
Covered: Manufacturing Defects Only
Warranty Form: https://www.theaudiostore.in/pages/warranty-claim-form
FiR Audio was founded in 2018 by two brothers, Bogdan and Alex Belonozhko and their friend Daniel Lifflander. Between them they have over 20 years of experience in designing and manufacturing some of the most advanced in-ear monitors while they were at 64 Audio. At FiR Audio, they are able to produce the next generation of IEM products, again pushing the boundaries of IEM technology.
In 2019 FiR Audio released the M-Series, their first line of In-Ear Monitors which gained considerable popularity from professional musicians and audiophiles all around the world. Featuring proprietary IEM technologies which all work together to provide the most natural and enjoyable listening experience. Including the ATOM venting system, Direct Aperture Acoustics, Tactile Bass, and the ultra-durable RCX connector. The M-Series showcased FiR Audio’s knowledge, expertise, and capabilities and cemented their reputation as a high-end in-ear monitor company.
Along the way, FiR Audio also tackled some of the biggest unsolved issues when it came to cleaning and maintaining in-ear monitors. This resulted in FiR Audio launching the IEM Vacs, followed later by the IEM Dryers. The perfect solution for audiophiles and monitor engineers who want to maintain their in-ears and keep them at peak performance at all times, also preventing repairs and down time.
Two years later, in 2021 FiR Audio released the Frontier Series, which includes the flagship Xenon 6, Krypton 5, and Neon 4 models. Packed with revolutionary technologies such as Kinetic Bass, a hybrid conduction technology which enables a very rich and natural bass, ATOM XS, the next generation ATOM module, Open Acoustics System, with Open Drivers that don’t use sound tubes, and Rigid Technologies that provide industry leading durability and serviceability of the IEMs. The Frontier Series comes in both Custom-Fit and Universal-Fit models.
They sound just amazing, I would say that the app a little rough to use. I can vouch they sound amazing. better than most of the tws which are out there in the market. Also, the Online dsp, gives a little edge it you want to tune them, and you can also upload your on DSP. Overall at this price point, It' a 10 on 10 deal.
This is a compact amp that has a clear sound output which can be described as slightly warm. Vocals are clear and midst nice. Works straight out of the box. Balanced xlr input is a big plus. Overall it is good value for the price. Will recommend it to everyone
Really a great product for the price offered using thebuds for the first time and it has exceeded my expectations. The sound is more balancednot a thumping bass but withclear vocals, treble and and a surrounding bass. Also there's someissue in connectivity which I faced at firstbut saw a tutorialon resolving the issue online.
everything is great but would have been even better if it had a mic
Awesome case, providing safety
It’s simply great upgrade from KZ. best output at best price
Had received in a day itself and it’s all that I had expected and more.
Very good sound and bass . Clear vocal and instruments
Fosi GR70 is an efficient amp and works well as a preamp as well as a headphone amp. It drives my hd600 excellently.
Amazing quality
Ordered 5 units and all were awesome
Thank you so much
Great part is that it got delivered very next day
I’m genuinely impressed. The sound quality is exceptional—crisp highs, clear mids, and a bass response that’s just right. It doesn’t overpower the mids or muddy the overall sound, which is a rare balance to strike in this price range.
🎧 Sound Signature: Tuned to the Harman Target with a tasteful bass boost. It adds warmth without sacrificing clarity, making it perfect for everything from vocals to electronic music.
🔊 Bass: Not too high, not too low—just enough to give depth without distortion. It complements the mids beautifully.
🛠️ Build Quality: Solid and premium-feeling. The fit is comfortable for long sessions, and the mic is a handy addition for calls or gaming.
Overall, it’s a fantastic value for the price. If you’re looking for an IEM that delivers refined audio with a touch of bass and excellent build quality, this one’s a winner.
Best among its price range. I think it's best value for money till 15k. And best overall sound quality under 10k. It's complete package. This is my first purchase before this, I used Sony WF-1000XM4 earbuds. This is gonna kill to its value for that impressive sound quality.
Good quality eartips. They are very comfortable!
"Amazing sound quality with clear vocals and deep bass. Very comfortable for long listening, and the build feels solid. Bought from The Audio Store – trusted, genuine, with GST billing. Easily the best choice in this price range!"
Great product. Great packaging in delivery
Brand Warranty
100% Original products with brand warranty
7 Days Replacement
On all orders*
Fast & Free Shipping
Ships in 24 Hours*
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Comfortable in ear, very clear bass and treble. Ultimate combination with audiocular dac and everyone should try this and you will forget other brands earphones.
Ultimate DAC under 1k..
They sound just amazing, I would say that the app a little rough to use. I can vouch they sound amazing. better than most of the tws which are out there in the market. Also, the Online dsp, gives a little edge it you want to tune them, and you can also upload your on DSP. Overall at this price point, It' a 10 on 10 deal.
Replaced standard issue 3.5mm plug with this. Sound quality has improved . Using it with Fosi Audio K7.
Quality of cable is also superb.
Thanks to TAS for a fast delivery.
Great place to shop for all audio requirements. Quick service and product as described. Will recommend it to 3
This is a compact amp that has a clear sound output which can be described as slightly warm. Vocals are clear and midst nice. Works straight out of the box. Balanced xlr input is a big plus. Overall it is good value for the price. Will recommend it to everyone
Really a great product for the price offered using thebuds for the first time and it has exceeded my expectations. The sound is more balancednot a thumping bass but withclear vocals, treble and and a surrounding bass. Also there's someissue in connectivity which I faced at firstbut saw a tutorialon resolving the issue online.
Hexa sounds super clear with nice vocals and just the right touch of bass, great for everyday listening.
Nice instrument seperation
Best Earphone you can get in this price category