FiR Audio Radon 6 earphones front on included leather case from Bloom Audio gallery
FiR Audio Radon 6 left earphone front closeup
FiR Audio Radon 6 right earphone front closeup
FiR Audio Radon 6 earphones rear highlighting bore
FiR Audio Radon 6 earphones with case from Bloom Audio gallery
FiR Audio Radon 6 right earphone rear over bright background
FiR Audio Radon 6 right earphone rear highlighting vent
FiR Audio Radon 6 earphones profile highlighting connector
FiR Audio Radon 6 right earphone rear closeup
FiR Audio Radon 6 front quarter sealed retail box

FiR Audio Frontier Series Radon 6 Limited Edition | Universal Tribrid IEMs

Regular price $3,299.00 Sale price$2,799.00 Save 15%


FiR Audio Radon 6 logo

FiR Audio's Limited Edition Radon 6 Tribrid Dynamic, BA, and EST Universal IEM

  • Limited Edition celebrating 5 years, Limited to 300 units Worldwide
  • Machined Aluminum shells and Sapphire Crystal glass faceplates
  • ATOM XS interchangeable modules for varying levels of isolation and bass
  • Includes leather protective case and Silver oxygen-copper 4.4mm terminated cable

Bloom's Take

FiR Audio may not be a longstanding household name you immediately recognize, but its founders have been pushing innovations in the IEM market as part of 64 Audio for years until starting FiR in 2018. The Radon 6 is the latest in their series, aiming to provide an engaging blend of accuracy and musicality that’s comfortable in both your living room and on the stage but in a universal fit.

It boasts an aluminum shell, is lightweight and ergonomic, and is super easy to get a good fit. FiR’s Kinetic Bass technology which yields a distinctive, accurate bass emphasis along with their ATOM pressure management system are brand standouts, bringing unique technology to the table that’s both practical and impressive. FiR Audio has differentiated themselves with the Radon 6 and the entire Frontiers Series by delivering excellent sound and true innovation. We feel that the Radon 6 is exceptional within today’s flagship IEM market, and comparatively speaking, there’s no reason for the Radon 6 to feel intimidated when IEM behemoths like CFA’s Trifecta and A&K’s Odyssey walk into the room.

Read our full review here.

Radon 6 is now available in a Limited Edition Custom-fit model!

Radon 6, from FiR Audio

The Radon 6 is a Limited Anniversary model, limited to 300 production units world-wild, celebrating 5 years in pursuit of the ultimate in-ear monitor listening experience.

Everything learned from the Frontier Series has been applied with a mindful retuning of the popular 6-driver model arriving at a leaner, reference warm sound signature. It features the proprietary technologies of the Frontier Series with Kinetic Bass, ATOM Venting, Open Acoustics, and Rigid Technologies.

The Rn6 is available in both Universal and Custom-fit models. The Universal-fit boasts a satin black machined aluminum body, gorgeous sapphire crystal glass faceplates, and a pure silver with copper shielding cable that's exclusively designed and built for the Radon 6.

FiR Audio Radon 6 on top of case from Bloom Audio gallery

Kinetic Bass

Kinetic Bass is a bass you can feel. Traditional IEMs often lack depth and feel because they only provide you with half the sound. Kinetic Bass technology features a 10mm dynamic driver that is open and optimally ported directly facing the outside of the IEM shell. This allows low frequency sound to be transmitted directly to the ear cartilage and surrounding area. These low frequencies are converted to kinetic energy and reach the inner ear via bone conduction resulting in a more immersive sound.

FiR Audio Radon 6 highlighting Kinetic Bass port

ATOM Venting

No more pressure. With a traditional in-ear, your ear canal is completely sealed with created air pressure which has no way to escape, causing fatigue in your ear drum and potentially long-term hearing loss.

With the ATOM system, your ear drums stay in their natural position so you can listen to music longer and safer without tiring. The soundstage is wider and feels more natural.

Open Acoustics

Traditional in-ear monitors use a driver with a sound tube that carries the sound to the canal stem. The tube introduces unwanted resonances and results in a closed-in sound. The Open Acoustics System consists of 3 major parts:

Open Drivers
Uses no sound tubes and radiates sound directly into the Sound Reactor for freely flowing sound and a much larger soundstage.

Sound Reactor
A chamber that shapes the sound received from the Open Drivers using natural acoustics instead of traditional dampers and filters.

Sound Reflector
Directs the high frequencies into the ear canal for remarkably smooth highs with great extension.

RIGID Technologies

Rigid 2-Pin
The most durable 2-Pin connection on the market, rated for 1,000 connections without issue. Features revolutionary quadrant socket design and fits any 2-pin standard.

Rigid Snap Screen
An acoustically transparent mesh screen that protects debris from entering the canal stem and is easily replaceable.

FiR Audio Radon 6 with attached cable with case in background


  • Machined Aluminum shells
  • Sapphire Crystal glass faceplates
  • (x1) 10mm Kinetic Bass Dynamic Driver
  • (x4) OpenDriver BA Drivers for Mids & Highs
  • (x1) OpenDriver Ultra-high Electrostatic Driver
  • Frequency Range: 20-20kHz
  • Impedance: 28Ω
  • Connector Type: 2-Pin 0.78mm
  • Cable: Pure silver, Oxygen copper shielded black cable with gold-plated balanced 4.4mm termination
  • FiR Audio 1 Year Warranty

In the Box

  • FiR Audio Radon 6 IEM
  • 4.4mm, 2-pin cable
  • Leather case
  • Warranty and instruction card

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Customer Reviews

Based on 6 reviews
Marzouq Almohammed
Radon 6

Great high end iem that has tons of clarity, and details yet without being boring. Radon 6 has warm characteristics with that Kinetic base element. RN6 is on top of my collection nothing beats it and that include Scarlet mini, Mest mk2, GAEA, Xenns UP etc… I highly recommend this iem if you got the money it does everything right, and it has right tonal balance, and perfect signature that’s natural with a physical bass aspect. Best bass texture in an iem period.

New experience

I have listened to a lot of headphones that are known for their bass, and I admit that I am a bass head. The Rn6 gives me both the resolution and the bass head needs. It is amazing, and I have compared the Sony ier Z1r with the Rn6 for a long time. The mid-range and high frequencies of Rn6 are also better.
When I first received the Rn6, I encountered some unusual problems. The Atom xs could not be plugged into the Rn6 tightly, but Bloom Audio helped me solve the problem quickly. Bloom Audio said on the homepage of the official website that the users are 100% satisfied. They Did it, Good Job Bloom Audio!

David M
New favorite IEM - more real

More liveliness and full bodied presence than any other IEM I've tried before

Kevin Self
FiR Radon 6 - Welcome to the new frontier!

I will keep it short and simple. It’s my personal G.O.A.T. - it does it all and extremely well. I really have no complaints about the sound and fit is spectacular. 💯 in love with Rn6.

Neil Snyder
If you have the money, buy now!

I am not an iem person. I own a bunch of high end headphones and gear. Listened to Passion for Sound review of the Radon 6 on Youtube and decided to take a chance. I am very disappointed as my favorite thing to do with new gear is to return it. Unfortunately, I am keeping the Radon 6 as it is magnificent. Tonally balanced, excellent staging and image separation, and marvelous detail retrieval. Sound is almost holographic. Bass is very tight and well structured and all frequencies are balanced with no tricks to lows, mids, highs. If you own a Chord Mojo 2 and want an end game iem to go with it, this is a match made in heaven.

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