1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.

    Dismiss Notice
  1. mvvRAZ
    Great IEM, amazing company
    Written by mvvRAZ
    Published Nov 19, 2019
    Pros - TOTOTL build quality
    TOTOTL imaging
    Some of the best customer service in the industry - highest standard
    Amazing bass and treble
    Balanced presentation as opposed to most other IEMs at its price point
    Cons - The midrange lacks some texture and detail
    They can sometimes struggle with complexity
    I'm going to keep this review rather brief, because the Fusion has already been covered pretty extensively

    Note: The rating I've given the Fusion has taken its price point into account, while the sound judgements are done with the same scrutiny as any IEM, whether it costs 100 or 10,000$.

    First and foremost, I can't stress enough just how good the service is. ItsFit have absolutely nailed it, and they most certainly know how to build a brand name. Any questions I had were answered in minutes, instant and lightning quick responses at various times of the day and night. Had a long and pleasant conversation with Nguyen, and it was a delight speaking to him about his product. He assisted me plenty with the design choices, as we discussed several options before settling for white shells with a golden paw print of my doggo. Again, absolutely amazing service, could not ask for better or even dream of it

    The packaging has been covered already - you get a little box, with a case and your IEMs inside. Nothing much to be covered here, personally I was pleased with how simple and clean it was.

    I opted for the rush order on mine, costing me 200$, but it really was lightning quick - ItsFit received my impressions on Wednesday, the IEMs were shipped out on Saturday, of the same week. Couldn't believe it myself haha.

    The build quality on these is absolutely perfect. The colours look stunning, they fit very well - mostly a comfortable fit as opposed to a really tight one, with decently deep insertion. What really deserves attention are the sockets - all my cables fit absolutely perfectly in there, not too tight or loose, just snap into place like they were meant for each other. Almost no other IEM I've owned, including from companies like VE or 64Audio (customs), not to speak of Noble and their sockets, is able to match ItsFit. If you have experience with the universal 64 line, it's something like that - pure excellence




    On how they sound - definitely give these some time to burn in, the treble tends to be really spiky and weird until the magnetostatic driver starts functioning properly.

    Once they do however, you're in for a treat. Amazing bass - tight and precise, with excellent subbass quantity (possibly somewhat elevated). The treble is the other aspect that really shines, and the mangetostatic driver really makes the magic happen. It is both forward and somewhat elevated, but with excellent sparkle and quality - not a hint of dryness. I've only heard that driver in Noble's M3 before, but the Fusion benefits from a much, much better implementation.

    The midrange is the supporting frequency region for the bass and the treble - it is definitely not recessed (can't even say it's a U shape, even less a V), but it feels like more of a connection than a self standing, ready to wow you midrange. It lacks texture and some detail, which is the only real weakness of the IEM. I don't think that's a mistake per se, but it's there to really let the treble and the bass get some additional attention. Given my preferences, and extreme midrange pickiness, there's a good chance these observations are somewhat inflated, and in reality it's pretty decent on its own

    The imaging is insane on these - the kind of imaging you'd get on a 3000$ pair of IEMs - pure TOTL material. The soundstage is pretty wide, and very deep. Couldn't really expect any better. The clarity also stands out, as they've been tuned to deliver exceptional clarity. Detail retrieval in the bass and the treble is great, acceptable in the midrange. The Fusion does sometimes struggle with muddier/more complicated tracks, mainly really old rock or jazz recordings, where you have tons of stuff going on at all times. The instrumental separation is normally great, but can get somewhat "overloaded" in such cases.

    In terms of pairings, I find the Fusion to be pretty responsive to cable rolling and source swapping. My current favourite is the ALO Audio Pure Silver (reterminated to 2pin) and the RME ADI 2 DAC. Paired with the SP1000M the treble becomes a tad excessive (even for me). I also tried the Fusion with the Silver + Gold from Plussound, but the pairing was far from ideal - I'd recommend a pure silver cable, as that is where the soundstage width is optimal and the clarity boosted even further

    Please once again note that my criticisms and evaluations have not taken the price level into account in any way or form, but are rather the same evaluation criteria I'd apply to the 64Audio Noir or VE Erlkonig.

    If you're looking for a balanced presentation, with excellent clarity, imaging, bass and treble, I would heavily recommend the Fusion. Its built by some truly wonderful people that have made it an absolute pleasure to purchase from them, and I will most surely be returning in the future - or well, I already have, as they're working on a reshell of my Noble Katana :)
    1. View previous replies...
    2. mvvRAZ
      Already answered in a different thread, but I listened to the M3 once and found it to be an extreme V :) can’t really give you detailed impressions cause I hate Vs and I didn’t listen to it very long
      mvvRAZ, Nov 20, 2019
      holsen likes this.
    3. FastAndClean
      looking good G
      FastAndClean, Nov 21, 2019
      mvvRAZ likes this.
    4. nihalsharma
      How is it compared to Andromeda?
      nihalsharma, Dec 5, 2019 at 7:14 AM
  2. MrLocoLuciano
    Beware of Vietnam nuclear Fusion !
    Written by MrLocoLuciano
    Published Nov 8, 2019
    Pros - Spacialization: width, depth and height
    Sub bass impact and clarity
    Mids intensity and air
    Treble smoothness
    Cons - Lacks a bit of definition and resolution


    Fusion were purchased directly from Itsfit Lab.

    Itsfit Lab is a Vietnamese company based in Hanoi and whose history is particularly short. Currently sold for $950, Fusion are hybrids composed of one 10 mm dynamic driver for bass, two balanced armatures for mids and high mids, and one 8mm magnetostatic driver for treble. The shell seems solid and the kraftmanship is of a very good level.
    They are available in universal or custom, and feedback is done on a universal model. The stock cable in 3.5mm jack is very well made and already allows you to take full advantage of the quality of these inears.


    Fusion signature is rather neutral with a small bass boost and 3 peaks well audible with a sweep at 2500, 5000 and 8000Hz.
    Here are the Crinacle measurements (uncompensated) to compare with the InEar PP8 (with bass boost).


    What strikes you from the beginning with Fusion is spatialization. The stage width is excellent, and well above average, at the PP8 level and therefore superior to what the Trinity SS offers. The depth is not far off, and of the same quality as on the Trinity SS, which is no small thing to say. The height is also of the highest order. The result is a beautiful scene like one encounters little, in the head certainly, but airy, and which allows an exceptional localization of the music.

    The bass is fast on impact, like on Trinity SS, but has a slightly slower decay that results in a softer sound. They go down extremely low with subs of an exemplary texture, and remain very legible despite this. They do not tarnish the rendering of the mids at all because of their very good linearity. The bass of PP8 are less present and softer, without the typical DD impact.


    Low-mids (250 to 500Hz) is warm and thick, it provides a foundation for voices and instruments. The Mids (500 to 2000Hz) breathe through the relative "hole" around 1000Hz and the rise to 2000Hz. The High-Mids (2000 to 4000Hz) centered on the 2500Hz peak is soft and allows harmonics to develop well.
    All this gives mids positioned a little forward, with a beautiful musicality, and with mild tone.
    In comparison, the Trinity SS midrange is more recessed at the bottom and more open at the top, which leads to a retreat of the scene and more potential hardness depending on its sensitivity. The PP8 mediums have a restitution that goes in the same direction as that of the Trinity SS, but in a less intensive manner.

    The treble provided by the magnetostatic driver is very extended but you will not find an ounce of hardness or sibilance. They are very natural, very fast and smooth, and are certainly not unrelated to the scale of the scene. The 5 and 8kHz peaks give life and space to the music, and the 6.2kHz dip on the measurements does not seem to be as present when listening to music.
    The PP8 treble is clearly more flamboyant and more linear but do cut earlier. The Trinity SS is a little duller and seems to cut a little earlier too, but seems as fast and more detailed.


    Separation and transparency are very good and almost comparable to what can be found in today's market leaders such as the Elysium or Trinity SS, but above what PP8 offers. On the other hand, definition and resolution seems a little behind the same tenors, and even the PP8.

    When playing with the tips, I prefer Whirlwind and Spiral Dots which provide a little more air to the sound and a pleasant lightness compared to Sedna. The fit is also outstanding.
    For cables, compared to the standard cable, the PW1950 provides a little extra on all levels while maintaining the initial homogeneity. The PW1960 2 strands as for him makes the mids move back and offers a more out of head scene that comes in an arc of circle, and a more analytical and technical rendering.

    Final Thoughts

    For its second inear and first hybrid, Itsfit Lab makes a strike by offering a very high quality restitution for less than $1000. Impact, legibility, intensity, air, it's undoubtedly high-end. In my opinion, however, it lacks a bit of definition and resolution to titillate the market leaders, who are nonetheless sold at a much higher price.

    "Resolution is the ability to individualize a voice or instrument"
    "Separation is the ability to feel space between the various sound sources"
    "Definition is the ability to perceive as much information as possible"
    "Transparency is the ability to transcribe the nuances and subtleties of music"

    My topic on Tellement Nomade here : http://www.tellementnomade.org/forum/viewtopic.php?p=671123#p671123
      EagleWings, proedros and mvvRAZ like this.
    1. holsen
      Bought 'em and excited. Thanks for the review
      holsen, Dec 3, 2019
  3. crabdog
    No conFusion here!
    Written by crabdog
    Published Nov 3, 2019
    Pros - Instrument separation, soundstage and imaging
    Clarity and coherency
    Build quality
    Engaging bass performance
    Detailed and resolving
    Cons - N/A
    Itsfit Fusion_3.jpg

    *This review was originally published on my blog.

    Itsfit is a relatively new company based in Hanoi, Vietnam that manufacture’s custom in-ear monitors (CIEMs). Despite only recently opening for business, they’re already delivering on a level you’d expect from a well-established brand in terms of product quality and user experience. In today’s review, I’m taking a look at the Itsfit Fusion, a tribrid custom earphone with a magnetostatic driver plus a dynamic, musical and immersive sound.

    Price $950
    Website: https://itsfitlab.com/

    This sample was provided for the purpose of an honest review. All observations and opinions here are my own based on my experience with the product.

    Package and Accessories

    Itsfit Fusion_1.jpg Itsfit Fusion_2.jpg

    The unboxing experience begins with a black box adorned with the Itsfit logo. This outer box was actually sealed in plastic; the first sign that I was dealing with a proper finished product and not just a branded DIY project.

    Inside you’re greeted by a plastic carrying/storage case plus the rest of the accessories. What’s in the box:

    • Itsfit Fusion in-ear monitors
    • Hard carrying case
    • Carrying pouch
    • Cleaning tool
    • Cleaning cloth
    • Detachable 2-pin cable
    • Warranty & documentation
    So far, it’s a fairly standard CIEM package, however, there are some things that stand out, most noticeably the uniform branding and feel of a finished product. For a company that is just starting out, there is a high level of polish here.

    Build Quality and Design

    Itsfit Fusion_23.jpg

    Let’s talk about the internals before we get to the actual design. Internally, the Itsfit Fusion has three types of drivers which were chosen for their optimal performance in specific frequency ranges. A 10mm dynamic driver was naturally chosen for bass reproduction, as they excel at moving air and creating authoritative lows.

    For the core and upper midrange, a dual balanced armature driver was given the task; perfect for fast transients and instrument separation. Lastly, the most exotic of the drivers, the 8mm magnetostatic, which is in charge of the high frequencies.

    Image courtesy of https://itsfitlab.com/
    Itsfit uses 3D-printing technology which allows them to produce the shells with more consistency and with advanced features, such as 3D acoustic chambers.

    In terms of build quality, the Fusion looks and feels fantastic. The shells have a uniform thickness thanks to the 3D-printing process and they feel fairly robust, although, you wouldn’t want to drop them of course. They come with recessed 2-pin sockets for extra durability as well.

    Itsfit Fusion_8.jpg

    When it comes to customization, there is visual product designer software on the website that lets you choose from a variety of colours and patterns for the shells and faceplates. You can also upload your own artwork or logo and you can communicate directly with Itsfit staff for even more options.

    My unit came with the “Skeleton Leaves” heritage design complimented by cyan-clear and pink-clear for the left and right sides respectively. I’m delighted with the way they turned out. The skeleton leaves design is exquisite and of course, every leaf is 100% unique courtesy of mother nature.

    Itsfit Fusion_17.jpg

    Comfort and Noise Isolation
    As always, the fit of your custom monitors relies on sending a good set of ear impressions. The website has a useful page with detailed instructions on how to get the best fit. It’s wise to print the instructions and share them with your audiologist.

    In terms of size, my Fusion earpieces are about average among my custom monitors. They’re smaller than the LXear Pluto, slightly larger than my Empire Ears Bravado and are most comparable in size to my Custom Art FIBAE monitors.

    Itsfit Fusion_13.jpg

    The shells are beautifully finished and are very smooth all over. I can wear them comfortably for hours but again, your mileage may vary and is dependant on starting with a good set of impressions or 3D scan.

    Noise isolation is par for the course in regards to modern 3D-printed customs meaning they block out a good 25-26dB of external noise passively so even playing music quietly will shut out just about all ambient noise unless you’re in an extreme environment.


    Itsfit Fusion_6.jpg

    The stock cable included with the Fusion was quite a surprise, as I was expecting to find the ubiquitous Plastics1 that comes with many custom in-ears. However, Itsfit includes their own custom cable and it’s a good one too.

    It’s a twisted 4-core SPC (silver-plated copper) wire with glossy black sheathing. It’s thicker than the Plastics1 cables and handles really nicely. There is very minimal microphonics and the cable drapes comfortably without any springiness or kinks.

    At the top are gunmetal-coloured 2-pin connector housings followed by heat-shrink ear guides. A small metal Y-split and plastic chin slider are next and the cable terminates in a straight 3.5mm plug. Each of the components is the same colour and have Itsfit branding on them. This is easily one of the nicer stock cables I’ve seen with a CIEM but I would love to see Itsfit add options for 2.5mm and 4.4mm balanced terminations as well.

    Itsfit Fusion_14.jpg

    Portable sources used: Shanling M5s / Sony NW-ZX300 / Soundaware M2Pro.
    Desktop source: Windows PC > Foobar2000 > FiiO K3.

    Alright, let’s get down to the meat of this review: the sound. The Itsfit Fusion’s defining characteristics are its clarity, timbre, tonal balance and staging. Too vague? Stick with me here, I’m getting to it. The overall presentation is one of balance, where the trinity of bass, midrange and treble are all on equal ground. A touch of warmth is added for intimacy and naturalness which combined with the staging and cleanliness makes for one very interesting performance.

    Technically, Fusion can go toe to toe with the best of them and surpasses many of those that are similarly priced. It’s supremely confident in its presentation without being brazen, not like the new kid on the team with something to prove but more like a player at the top of their game.

    Itsfit Fusion_9.jpg

    Itsfit have chosen a 10mm dynamic driver for the bass reproduction and it pays off handsomely. The bass is boosted a little north of neutral but governed and balanced with the mids and highs. There’s plenty of force in reserve when required though and the Fusion has sufficient impact to work across any music genres.

    The Fusion’s bass is simply among the best I’ve heard on a CIEM. It seems to dig down forever but it’s not sheer grunt that makes it special; It’s the depth of its extension coupled with its resolution and definition. It also comes from the naturalness in its weight and tone plus the clean leading edge and the relaxed but never loitering speed of its decay.

    Listening to Hans Zimmer’s “Gotham’s Reckoning“, Fusion recreates the dark foreboding tones of the synth bass with a physical rumble and the potent drums of war with all their vast grandeur while sustaining just enough restraint to keep them in check.

    The Fusion’s midrange is a mix of clarity, body and naturalness. It has pristine cleanliness but blends it with a musicality rich with detail and nuance. Instruments are neutral in size so they never sound thick or clammy nor are they analytically thin. Stage positioning is also neutral, allowing you to take in the full scene but keeping you close enough to feel immersed in the sound.

    Vocals are rich yet articulated, whether male or female, the Fusion’s midrange is rendered evenly without any area taking precedence in the overall presentation. Perhaps the midrange’s greatest asset though is it’s natural timbre. That cleanliness has an underlying warmth that is ever so inviting but never cloying. Fusion’s mastery of midrange timbre is evident in tracks like Above and Beyond’s “Sun & Moon – Live At The Hollywood Bowl“, where it renders the instruments, vocals and the crowd with vivid naturalness.

    So now it’s time to see what the fancy magnetostatic treble driver can deliver; Is it merely marketing buzz or does it really add value to the sound? Well, I’m a believer, let me tell you. Fusion’s treble is crisp and lively with a light halo that adds a touch of softness and body. A brilliant extension gives it abundant airiness while its tastefully even presentation keeps it smooth and fatigue-free.

    There’s sufficient sparkle and shimmer but thankfully no sign of sizzle or sibilance. Given its calm delivery, it’s striking how it can still be so precise, detailed and accurate. There’s no evidence of compression or steeliness either – timbre is another box the Fusion’s treble ticks off with zeal.

    Fusion’s soundstage is stately in its dimensions and very stable by nature. While that in itself is an achievement, it’s made even more extraordinary by maintaining instrument and vocal note size and density. The result is a stage that is not only large but is holographic with precise imaging and spatial cues. Stellar instrument separation and a black background give the Fusion tangible layers of width, depth and height.

    M-Fidelity SA-50

    Itsfit Fusion_20.jpg

    The SA-50 has long been one of my personal favourites. With 5 BA drivers per side, it has a balanced signature with great end to end extension and superb detail retrieval. SA-50’s bass is still my top pick for an all BA bass – it sounds so natural and carries itself with imposing authority. That said, it can’t bring the same level of impact as the Fusion’s dynamic driver although it does get very close.

    The midrange of the SA-50 is more in line with its bass and treble as its whole presentation is very linear across the board. Vocals are more upfront on the Fusion and they’re positioned more forward too – the SA-50’s stage position is further back.

    Both iems share a similar treble quality with excellent timbre and airiness. The SA-50’s treble sounds slightly more feathered and the Fusion extends a touch further. When it comes to stage dimensions, the SA-50 is wider but not as deep. Therefore, stereo imaging is stronger on the SA-50 but the Fusion has more clearly defined layers.

    Itsfit’s Fusion is the first custom monitor that has challenged the SA-50 for the top position in my collection. Thankfully it’s different enough to compliment the SA-50, rather than having to compete directly with it.

    LXear Pluto

    Itsfit Fusion_21.jpg

    The LXear Pluto is a 4BA iem and has a bold and upfront presentation with a strong emphasis on bass. Tonally, it’s much warmer than the Fusion due to the underlying bass colouring the sound from top to bottom. How the Pluto performs really depends on the amount of bass in each individual track. In bass-heavy songs or music, it tends to become congested and stuffy while the Fusion is able to maintain its lightness and separation regardless of the recording.

    Both iems have a similarly upfront vocal presentation but the Pluto doesn’t have the same separation or layering ability and as a result, it has a less convincing stage that is surrounded by heavy, rounded bass notes.

    It’s a similar situation in the treble too. Even though Pluto’s lower treble is more forward it’s mainly there to compensate for the powerful bass and the stage still ends up being darker than the Fusion.

    These have starkly opposing approaches and each one would no doubt appeal to different listeners. The Pluto would be ideal for musicians as a stage monitor or people who want a more upfront performance with a wow factor. The Fusion, on the other hand, has more of what is commonly known as an audiophile tuning that concentrates on details and nuances rather than sheer fun factor.

    Empire Ears Bravado

    Itsfit Fusion_22.jpg

    The Empire Ears Bravado is a dual-driver hybrid with one dynamic driver and one balanced armature. Its sound signature is more L-shaped and less mids-forward than the Fusion. Its extra bass presence brings with it more warmth and body. In contrast, the Fusion’s bass is tighter and has better definition but has less overall impact.

    Bravado’s midrange sits further behind the bass and goes for more smoothness over absolute clarity. Furthermore, the treble is more laidback and doesn’t have the extreme extension that the Fusion has.

    A direct result of the relaxed treble and rounder bass is the Bravado’s smaller stage, although it is still excellent for such a warm iem. The Fusion has more pinpoint imaging thanks to its detailed treble and tighter bass plus clearer air between notes gives it stronger instrument separation.

    Itsfit Fusion_4.jpg

    I have to admit that I was not expecting to be affected in such a manner by the Fusion. While it’s not unheard of for a new brand to enter the market with an excellent product, it is uncommon for one to manifest with such a level of completion. The Itsfit Fusion feels whole in every sense; from the coherency and maturity of its sound to the branding, packaging and build quality.

    The Fusion has a golden ratio of bass, midrange and treble that creates the perfect mystic blend. No single IEM is going to please everybody as personal preferences in tuning and musical tastes vary too much but it’s hard to imagine most people not loving the Fusion. Not only does it excel on a technical level but it has a tuning that is lavishly musical and impassioned. With its fun but tight bass, liquid midrange and spectacular treble, it is simply outstanding.

    • Driver configuration: 1 Magnetostatic driver, 2 Balanced Armature drivers, 1 Electro-dynamic: low
    • Freq. Response: 4Hz – 40kHz
    • Sensitivity: 98 dB/mW @ 1kHz
    • Impedance: 13.1Ω @ 1kHz
    • Isolation: -26dB
    • Price $950
    • Website: https://itsfitlab.com/
      davidmolliere and ariasuki like this.
    1. View previous replies...
    2. crabdog
      They're not hard to drive at all - they sound pretty good even straight from my Android phone. But naturally, they do scale and perform better with a proper source.
      crabdog, Nov 10, 2019
      davidmolliere likes this.
    3. nihalsharma
      How is it compared to Andromeda?
      nihalsharma, Dec 5, 2019 at 7:12 AM
    4. crabdog
      @nihalsharma I'm not familiar enough with Andros sorry (only had a brief listen at CanJam a couple of years ago). Someone else will be able to chime in for sure though.
      crabdog, Dec 5, 2019 at 9:25 AM
  4. fritobugger
    Hits all the right notes plus extra bass
    Written by fritobugger
    Published Oct 23, 2019
    Pros - Overall general sound quality is amazing. Excellent bass quality.
    Cons - A bit too boosted in the bass. While the bass quality is great it is just a bit too much quantity for me.
    I got to try the universal version at their shop in Hanoi last week. They remind me of the 64 Audio U12 Adel but with a more organic/natural sounding bass. Like the U12 these have just a bit too much bass for my taste not that it overwhelms the mids, the bass is just a bit too boosted for me. I prefer the 64 Audio U10 profile. That said, they did sound really great. The mids and highs were nice with nothing missing, the highs were nice and crisp. Back to the bass, it was not bloated nor muddy, I was hearing things from Tony Levin's stick and bass in King Crimson's Discipline album that I had never hear before. The team at Itsfit say the bass can be tuned to match my preference which is good to know. At the price of $950 they are really an amazing deal considering they sound as good or better than items costing much more.
      ariasuki and Cat Music like this.