ItsFit Fusion & R3

ItsFit Assemble!

PROS: (Fusion) – Exceptionally good build quality, sound quality, shell customisation designs, looks, good integration of magnetostatic driver, open, rich, dynamic, energetic and exciting sound.
(R3) – Exceptionally good build quality, nice reference style signature especially for the asking price, looks, customisation options, price.

CONS: Lack of variety/options in stock ear tips necessary for snug fit. (Fusion) – I personally love the treble but one needs to tip-roll to find the best balance as per one’s preferences and liking.
(R3) – People who prefer forward upper-midrange style of reference (Harman/DF) might wish for more pinna gain in upper mids. Nitpicking – It can do with slightly better sub-bass extension, a bit cleaner precision in the lower mids and a bit more definition and punch in the upper-midrange and treble to be absolutely true ‘reference’. #wishfulthinking 


I would like to thank ItsFit for sending me the Fusion and R3 to test and review. I am not affiliated with the company or any of its sellers and write this review with an unbiased opinion regardless of how the review turns out.

Links – ItsFit Website | Fusion ($950) | R3 ($305) | ItsFit Facebook | ItsFit Instagram

Both Fusion and R3 can be ordered as universals or customs. Itsfit offers numerous shell and faceplate customization options where imagination is the limit.

Genre preferences.

I majorly listen to rock, acoustic, pop, metal, and occasionally popular EDM songs.

About Itsfit.

ItsFit is a Vietnamese company, who have been re-shelling IEMs for the last 3 years and only recently launched two of their own IEMs, R3 and Fusion, which we will be checking out today. In my opinion, ItsFit is a brand to watch out for as they have good R&D experience, interesting tech in their IEMs and some of the most attractive shell designs I have come across. They regularly receive high praise for their re-shelling and recently Fusion has been making waves too.

Picture courtesy – ItsFit

Technical Specifications. 


  • Configuration – 1 Magnetostatic (Treble) | 2 BAs (Mids) | 1 DD (Bass)
  • Freq. Response: 4Hz – 40kHz
  • Sensitivity: 98 dB/mW @ 1kHz
  • Impedance: 13.1Ω @ 1kHz
  • Isolation: -26dB


  • Configuration: 3 proprietary precision BAs (1 Knowless, 2 Sonions)
  • Frequency response: 5 Hz – 22 kHz
  • Input sensitivity: 112 dB @ 1 kHz, 1 mW
  • Impedance: 35 Ohms @ 1 kHz
  • Noise isolation: -26dB

Main Photo

Included in the box.

I got both Fusion and R3 together in the same package. They anyway have common packaging and accessories. ItsFit packaging is minimalistic but cool, as they focus on the things that are important; stuff that you’ll actually use.

  • In-ear monitors
  • 2-pin cable
  • 2 sets of ML ear tips
  • Hard case
  • Carrying pouch
  • Cleaning cloth
  • Cleaning tool
  • Handwritten welcome cards
  • Warranty card

Build Quality.

ItsFit IEMs have fantastic build quality, period! They also have some of the most interesting and attractive shells designs in the industry that I’ve come across. Fusion and R3 universal shells are identical except for Fusion having three vents which look like grip holes in bowling balls. IMO, it is a very interesting design for dynamic driver venting. It not only serves its purpose but also looks very cool!

Both are made out of resin and have very cool nozzles that are transparent and different from the shell colour. They kinda look like a different part that is glued to the main shell but I don’t know if that is the case or not because it is very well integrated. As you would expect from a company that solely provided a re-shelling service for a few years, the shells have absolutely no bubbles or residue glue visible. Also, in case of R3, what is cool is that ItsFit fills up the shell with glue completely where other companies fill it partially. This actually makes the shells look like one solid piece and even more attractive, a bit candy like. I figure that it would make driver extraction in case of repairs or re-shelling difficult, but I’m sure they have a plan for that as I feel that ItsFit guys are pretty smart about most things.

The shell customisation I requested for Fusion came out perfect! You can see how good it looks in my pictures. R3 shells on the other hand were a surprise as I hadn’t asked for anything in particular. They came out equally great! In fact some of my friends dig the R3 shells more than the ones I chose for Fusion. Lol!

Cable – R3 and Fusion both come with the same cable. It is a silver-plated copper cable and pretty good too, much better than the cable that comes with 64 Audio IEMs. It has nice looking and very solidly build connectors and jack. I love the grey-ish colour they have. Cable has a nice braid and very little microphonics. Though I’d love to see an UP-OCC kinda cable included with Fusion, I actually have no problems with the stock cable.

Hardcase – The included case is similar to what comes with 64 Audio IEMs. I personally like these cases since I’ve been using them for a lot of years.


Fit and Comfort.

Since both Fusion and R3 share the same universal shell design, they fit similarly. The shells are semi-custom shape and are small enough to fit most ears. But the fit and comfort completely depends on the choice of ear tips. What makes ear tips difficult to choose is that both Fusion and R3’s sound signature is a bit tip dependent and changes with snugness of fit. So you gotcha mix and match and see which ear tips sound the best and which provide the best fit. The ItsFit semi-custom universal shells aren’t as ergonomic as the ones from Fearless or BGVP as the latter work pretty well with multiple types of ear tips. In my case the nozzle needs longer ear tips for a snug fit. Though if you choose the right ear tips, ItsFit shell can fit as snugly, if not better, as the ones from the other two companies. So choosing the optimum ear tips is important. Sadly, ItsFit do not provide a variety of ear tip options in the package. So, having a collection of different kinds of ear tips will help. Foam ear tips work really well for me, so definitely keep them handy if you own some.

Here are some Silicone ear tip options that I settled on. (Move cursor on image for description). 

Noise Isolation.

The ear tips that provided the snuggest fit of course had the best isolation too and the isolation was as good as it can get for a universal shell. Though Fusion’s noise isolation is relatively lesser than R3’s because of its vented design.

Page 2 – Sound Analysis – Fusion.
Page 3 – Sound Analysis – R3.
Page 4 – Comparisons, and Conclusion.

2 thoughts on “ItsFit Fusion & R3

    1. Hey Amir! Thanks! I actually listen to a lot more metal but if I start mentioning all of that in my Reference List, it’ll take up all the space on the page. Haha.

      Feel free to drop band suggestions that you’ve been listening to. 🙂

      Liked by 1 person

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