FiiO FD3/FD3 Pro Single Dynamic Driver Iems with a detachable cable

General Information





Key features of the FD3/FD3 Pro include:

*Flagship-level DLC diamond diaphragm

*Front acoustic prism

*Semi-open acoustic design
* Interchangeable sound tubes

*2.5D film coating glass faceplate

*Quality swappable cable

To find out more about the FD3/FD3 Pro, please visit the product page on

Latest reviews


500+ Head-Fier
Punchy, warm and dynamic single DD
Pros: Excellent build quality
Very generous accessories especially at the price point
Good comfort, very good isolation
Punchy and dynamic tuning
Very percussive bass
Warm and inviting midrange
Slightly bright yet smooth treble region
Well-proportioned soundtage
Above-average imaging
Choice of tuning nozzles as well as tips that make a noticeable difference in sound
Cons: Midbass can be boomy on some tracks/genres
Not the most resolving or detailed
Soundstage is not very large
Does most things well but not a lot to set it apart at an increasingly competitive price point
Introduction: FiiO is a brand that likely needs no introduction, being one of the best-established Chinese brands of DAPs, DACs, and IEMs. Their newest effort, the FD3, is our subject today, being the mid-tier entry in their line of single dynamic driver IEMs. While it sits between the entry-level FD1 and the flagship-level FD5, it shares much more in common with the latter both in terms of tuning and technology. The FD3 inherits such features from the FD5 as a semi-open design with an acoustic prism cavity, interchangeable tuning nozzles, and (in the case of the FD3 Pro) interchangeable cable terminations.


The FD3 however no longer employs a beryllium-coated diaphragm, but rather a full DLC (diamond-like carbon) diaphragm in its 12mm driver which sports a magnetic flux of 1.5 Teslas. Other than the redesigned shell, this change in the dynamic driver material constitutes the main difference between the FD3 and its older brother the FD5.

I would like to thank FiiO for providing me with a sample of the FD3 in exchange for my honest review.

The specifications of the FD3 (which is Hi-Res Certified) are as follows:
  • Driver: 12mm dynamic driver with DLC diaphragm
  • Frequency response: 10Hz-40kHz
  • Impedance: 32Ω@1kHz
  • Sensitivity: 111dB@1mW
  • Max input power: 100mW

Packaging & Accessories: FiiO is without a doubt one of the manufacturers most generous with its included accessories, even on entry-level models such as this one. The FD3 comes with a Pelican-style hardshell storage case, three sets of S/M/L silicon tips (Balanced, Vocal, and Bass), two sets of medium memory foam tips, an MMCX tool, a cleaning brush, a set of treble tuning nozzles (in addition to the installed bass nozzles), and cable. The choice of cable is the only difference between the FD3 and the FD3 Pro: the standard model (which I received) includes a 4-strand single crystal copper cable with a 3.5mm termination, while the Pro model includes an 8-strand Litz silver-plated single crystal copper cable with interchangeable 2.5mm, 3.5mm, and 4.4mm terminations.


The cable included on the standard model is to me a major improvement from the one on the similarly-priced FH3, which was quite thick, springy, and unwieldy, in addition to having an incredibly heavy L-shape plug that felt as though it could easily crack the glass on one’s phone or DAP if not careful. The FD3 standard cable by contrast is light, supple, thin, and has a much more normally constructed L-shape plug; the ear hooks are comfortable and flexible as well. The included tips are all more than usable and have a noticeable impact on the sound, thus providing the ability the fine-tune the sound even beyond the options provided by the two sets of nozzles.


The inclusion of the MMCX tool is extremely welcome, and in my opinion other manufacturers should take a page from FiiO’s book here as it makes life significantly easier when changing cables. The tool is a different style than the Final MMCX tool included in the FD5, but I find it to work equally well.

All in all the FD3 accessories put to shame some units sold at five times the price, and I don’t think anyone will find cause here to complain.


Build & Comfort: The FD3 is constructed of an aluminum-magnesium alloy that looks quite fetching alongside the glass-covered celluloid faceplate. The shells feel solid and well-made, while remaining exceptionally light. The barrel-style body is not as ergonomic as the semi-custom shape of the FH3 (which, for me at least, probably constitutes peak comfort at the $100 price point), but aided by its light weight the FD3 nevertheless remains quite comfortable even over longer listening sessions. Despite the semi-open design coupled with a vented DD, isolation surprisingly is still above average for me — and I never experienced any driver flex whatsoever.


My one complaint is that the MMCX cable connectors spin somewhat easily out of box, which gives me a bit of cause for concern regarding longevity. This is a marked contrast from the connectors on the FH3, which felt practically bolted in place.


Signature: The FD3 is a warm V-shape IEM. The tuning struck me initially as being overall rather balanced as V-shapes go. However, upon further listening the relatively high midbass quantity began to bother me and the FD3 began to come across as somewhat boomy on certain tracks. I left them to burn in for about 50 hours — generally I do not find burn-in to make a difference in most IEMs, although some DDs do seem to attain a better bass control after they are broken in. Thankfully in this case I did notice some improvement, which was further aided by switching to the wide-bore bass tips (despite the naming of the tips being somewhat counterintuitive here). I also tried switching to the treble nozzles, but I found the peaks in the upper regions to be rather bothersome as a result. The V-shape does become more pronounced with the treble nozzles as well, and so I settled back on the bass nozzles in conjunction with the wide-bore tips as providing the best balance overall. In this configuration after burn-in, they can perhaps best be characterized as a more punchy, dynamic, and warm version of the Moondrop Aria.

Bass: As mentioned above, the bass is extremely percussive in character, and is given a quite healthy boost in quantity in addition to its excellent extension. While objectively speaking the subbass and midbass are given equal emphasis, the amount of bleed into the mids means that the midbass often dominates in a subjective sense. Whether this is a blessing or a curse depends almost entirely on personal preference as well as one’s musical library. Speed is very good, and decay is rather fast although the attack can feel a bit blunted. Texture is present although not class-leading.

Mids: Despite the V-shaped tuning, I find the mids to be very pleasing on the FD3, and actually are my favorite region of this IEM’s frequency response. The midbass bleed gives a very pleasant warmth to the lower mids, and male vocals have very good body and note weight. Female vocals are also quite well-done, being properly energetic yet without any sibilance or harshness. However texture and details are nothing out of the ordinary, and the FD3 is definitely going for a musical tonality rather than analytical prowess.

Treble: The FD3 has a fairly good treble response for a single DD IEM, and is in general just a bit on the bright side though remaining quite smooth (on the bass nozzles at least). There is a bit of a peak around 5K which on the bass nozzles I find to be quite pleasant in imparting some energy into the otherwise warm presentation, but it can become offensive to some folks on the brighter treble nozzles. There is some air and extension, although hybrids will have little trouble besting the FD3 in this regard at the price point. Cymbals have a very natural timbre, although the decay is again a bit on the quicker side.

Soundstage & Technicalities: While the semi-open design of the FD5 by most accounts resulted in one of the largest soundstages amongst IEMs, I did not find the same to be the case for the FD3 with its modified venting in the MMCX connectors rather than the faceplate. Overall the size of the soundstage is not much above average, however I did find it to be much more spherical than most budget single DDs, with very good height. Imaging likewise is above average for its class, although it falls short of pinpoint accuracy. There is a good amount of air between the instruments on simpler tracks, although the midbass can obscure this when it has a lot of presence in the mix. The weak point of the FD3 for me is in resolution and detail, which is not much above average. Timbre on the other hand is quite good, being limited only by some lack of sharpness in the attack. While the FD3 is by no means incompetent when it comes to technicalities, one isn’t really buying it for its technical chops but rather for its punchy and dynamic tuning.


Conclusion: The $100 price point these days is a quite challenging place to live. FiiO brings a lot to the table here, especially in its stellar build, generous accessories, natural timbre, percussive bass, invitingly warm midrange, and fairly refined treble for a budget single DD. The tuning nozzles and included tips give an ability to customize the sound not often found at this price point. However, the central question here is unmistakable: is this type of tuning for you or not? Does a heavy midbass punch enhance your library or detract from it? Ultimately only you can answer this question, and it is this answer that will in turn determine whether I can recommend the FD3 to you or not. Thanks for reading!

Thanks for this!

I'm interested to know how these compare to the Tin T4
@InvisibleInk Ive not heard the T4, but i actually prefer the T2+ to the FD3 by quite a bit (mostly for the tuning, although technicalities are fairly similar).


New Head-Fier
FiiO FD3
Pros: Sound, Soundstage, Bass, Design, Quality, Size shells, Package, Acessories
Cons: Rigid cable for FD3 version

I was really looking forward to this new product, because I am a longtime fan of FiiO, it was thanks to them that I learned what a truly audiophile sound is. At first they were F9, then FA1, then FA7. If you buy FiiO products, you cannot remain indifferent to this, absolutely all owners of FiiO products can confirm my words here. If I remember correctly, I dedicated a review of FD3 lol

Package. The impeccable quality of the box materials, the updated design of the printing, very interesting (visualization of the technologies used in the model appeared). The package bundle is as as always, but not overblown in quantity, everything you need, including a chic carrying case that has saved my FiiO F9, FA1 and FA7 more than once

Quality of materials and build quality. Guys, this is FiiO, unfortunately or fortunately I have never seen anything of poor quality in the products of this company (packaging, accessories, headphone shells, build quality, etc.), in this case there are no exceptions, everything is flawless

FD3...they turned out to be smaller than I thought, so in my review I took a picture to scale. On the one hand, I personally wanted a larger shell of shells, because my ears can afford it lol, on the other hand, they will fit into 95% of the ears of the target audience, which will also favorably affect their popularity, and I am sure of that

Comfort and ergonomics. Shells are medium in size, about the size of the FA1 and slightly larger than the F9/ F9 pro. The sound guide is long and located at an anatomical and correct angle; sound insulation is obtained at a very high level. Shells have a rounded shape and because of this they are very comfortable and comfortable. The cable is a little solid but feels very reliable. I have never had FiiO cables out of order, so I sometimes buy them separately, for example, the silver FiiO D series is a separate little masterpiece, but I'll tell you about it next time

Sound. I won't write anything about sound at all... lol. FiiO's signature sound signature in the FD3 model continues its life, but acquires new shades and colors, due to new drivers, FiiO's constant experiments with internal cameras and cable materials. All these experiments surprise me every time as a child who is waiting and happy with a new toy

The sound is balanced, with very deep and beautiful bass, I would call them intelligent, sound like a large and very expensive stationary subwoofer. The middle frequencies are outlined, structural and occupy only the position assigned to them, without mixing with the upper and lower spectrum. The highs knocked me off my feet, they sound like a precise and carefully tuned BA. A clear and sonorous sound, but with a comfortable, soft and textured transmission of live instruments and vocals, it's incredible...

Listening to FD3, I once again became convinced that constant 8ing, it is an evolution, an evolution that has not ended. Now, some $ 100-150 IEMs sound like $ 500-1000 IEMs sounded 5 years ago. Someone may disagree with me, but I do not need your consent, I write what I feel. The production of portable audio is no longer just a business, but rather a meaningful production of engineering, tactile and visual art. FiiO FD3 is just an exemplary example of such art, I admire him (or rather, before the people who did it)...

Highly recommend FD3, no matter if you are a beginner or an audiophile with burnt ears...well, you won't be disappointed

Appreciate the small and you will touch the great ©

#FiiO #FiioFD3 #FiiOiem

Link to store:


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You also get the pen, watch and pocket knife, sounds like a great deal to me !


Headphoneus Supremus
Fiio FD3
Pros: Newest dynamic earphones with trickledown tech from previous higher end FD5 in design. Excellent balanced tuning with 2 nozzle filters balanced and enhanced treble nozzles which is improved from their previous FD5. Two more distinctive sound tunings due to how good the nozzles work. Balanced and a more V shaped tuning using treble filter. Magnesium aluminum alloy CNC machined housing with top quality design and aesthetics, Semi open design throws out a wide big stage. Excellent top tier accessories package. Base FD3 comes with a nice monocrystalline 4 cored copper cable in single ended only. Pro model adds an upgraded silver plated monocrystalline copper cables in 8 cores with modular connectors. Aggressively priced for what you get a supreme value at the price level.
Cons: Know it all poindexters that look at a graph and think they know exactly how these sound.
Fiio FD3

You know all about their audio players but they can certainly make some great sounding earphones. Their recent earphones the FD5 and FH5s both have their top of the line designs. Fiio seems to continually get better at their craft and it is the one consistent I admire about the Fiio group. If you folks think these guys don’t listen to feedback from their audience, I present to you the FD3. Any good manufacturer should take the feedback from their patrons and do one better for next time. Doing one better should always be the game and here I am all too happy to report. The FD3 is not necessarily a lesser earphone compared to their two previous offerings. In fact I am gonna try to convey to you why I think the FD3 is an actual step forward.

I have seen Fiio make audio goods and with each iteration improve upon former designs and now with the Fiio FD3 we are seeing something that the group has taken to heart and has brought down the price to be not only affordable but I can tell has revamped their tuning to be more agreeable with a much wider audience of enthusiasts. It is probably one of the most difficult things to do. How do you please the huge dichotomy of enthusiast tastes in sound from a single tuning on an earphone. That is a logistic and technical nightmare but you certainly can't just sit around and say. Well we tried and give up. Nope that isn’t what Fiio seems to be about.

It is about advancing forward and going back to developing one better to advance your name sake. But then if you make something better you better raise prices right? Nope, their newest FD3 has a crowd pleasing $100 price point. Take a good look at what $100 buys you nowadays in earphone land and you will most certainly not say. A high level earphone. A lower end basic mid fi level earphone cable, yes a budget level cable can cost a $100 easily. $100 earphones are still considered budget fi in real world terms. It seems while most manufacturers are trending the opposite way and charging a premium for minor tweaks and advancements to their previous offerings.

Fiio is bucking that trend with their newest release the FD3. Before I continue I would like to thank Fiio for the review sample of the FD3 which was provided for the purpose of a review. You can look up what the FD3 is all about on their dedicated web page here and if you feel the need to buy an accomplished Fiio made earphone you can get one here and or on Amazon here.

The FD3 went through a week's worth of burn in and sound assessment was done using my Fiio M15, Shanling M6pro, M5s, M3s, IBasso DX160 Sony ZX300, Pioneer XDP-30r Fiio E12a, IBasso PB3, and IFI black label for amping. Sound was mostly assessed using the stock balanced filter. I will describe how the treble enhanced nozzle filter sounds on the FD3 in the sound description later on in the read.

The FD3 design has a lot to do with their higher end sibling the FD5. Both utilizing a custom built aluminum-magnesium alloy body. Strong and light is the purpose here. It uses pretty much the same exact shape both utilizing prism baffles and tuning nozzles with a semi open design. The drivers are different and since the new Diamond like Carbon 12mm driver is not coated with Beryllium that savings goes toward the consumer. There seems to be advantages for the Beryllium coating which mostly affects bass and a slightly richer tone but otherwise the DLC 12mm driver is a higher level dynamic you can associate with much higher end offerings. Venting seems a bit different where the new FD3 air vents are at the bottom of the mmcx connector housing while the FD5 uses venting on the back of the shells. Their pro model throws in their highly resolving monocrystalline silver plated cables in 8 cores and uses Fiios version of their modular design. The non pro vision uses a 4 core monocrystalline copper cable in single ended only. The finish is darker pewter grey color with brass accents vs the all chrome look of the FD5. The copper accents that highlight the name Fiio on the glass faceplate looks classy. I have always admired Fiios design aesthetics and the new FD3 you're getting one of their absolute best in house designed CNC machined housings.

Fiios commitment to the end user experience shows as even their base model of the FD3 includes a premium accessories package that you would not expect. Certainly not at the $100 level. Their included tips has very good variety. A silicone set with 3 sizes for their bass tips, vocal tips, balanced tips and also includes two pairs of quality foam tips. Included is their medium sized plastic otter type box to carry all of it. One thing I forgot to mention is their handy mmcx separator tool. Why other manufacturers don’t provide something like this for their earphones I have no idea.

The new FD3 build quality is what you would expect coming from Fiio. They set the design aspect of their earphones on a higher level than most in the industry. The shells to the materials the workmanship, drivers used, the accessories. It is top level stuff always. However recently their earphones had some falling out of sorts with the community. Some loved their FH5s and some reviews not so much. I am a glass half full type of guy and try to report the positives and negatives in a sound and try to relay that message to my readers and how a particular earphone will sound with a very eclectic music variety I listen to. I thought the FH5s had some amazing bass and mids presentation but was debatable how the treble was tuned. I found out that this tuning was catered more for Asian enthusiasts more so than western tastes so that made much more sense in what Fiio was trying to achieve. The FD3 tuning will satisfy much more than the Asian enthusiast community; it should satisfy anyone that listens to music as it actually has two distinct tunings with an easy nozzle change that happens to be a much improved filter design stemming from the FD5 tuning nozzle idea.

The balanced tuning of the FD3 holds some similar aspects from its higher end siblings. It shares the bass impact and tonality of the FD5, the bass extension and rumble of the FH5s. The mids in tonal quality and presence of the FH5s but now has a much more cohesive and smoother treble than either of their previous earphones, especially their FH5s. Bringing down the treble emphasis, this forwards the mid range and bass presence balancing out the sound and tonal qualities and that is what I am hearing from the FD3. By far their best balanced tuning using the balanced filter but the longer I was using the FD3 I realized the new FD3 is much more versatile than what is presented with the tuning nozzles.

Fiio tunes with a variation of the v shaped harmonish tuning philosophy but this time around the mids do not take a step back nor does the treble stand on its own..

Treble this time around is not nearly as pronounced as it was on their previous FH5s. In fact even with the treble filters their much improved cohesiveness really makes a difference. Fiio always seem to incorporate some type of treble spike in the treble tuning but this time around not so much. The balanced filter does such a great job evening out the treble some might actually miss some of that accentuated treble sparkle of the previous earphones. Hence the need for a pro version. The pro version with its more resolving cable enhances upper notes on an earphone but how it sounds with the balanced filter gives by far their best sounding FD3. With the treble nozzle the FD3 takes on more of that V tuning to be pronounced. Treble is enhanced using the pro cable and the treble filter which provide the greatest treble energy and sparkle out of all the configurations. Treble heads would be happy here.

So treble/ detail level goes from most treble emphasized level to a smooth warmer more musically balanced emphasis using the following.

Treble nozzle+Pro cable
Treble nozzle+Pro cable+Foams
Treble nozzle+Standard copper cables
Treble nozzle+Standard copper cables+Foams
Balance nozzle+Pro cable
Balance nozzle+Pro cable+Foams
Balance nozzle+Standard copper cables
Balance nozzle+Standard copper cables+Foams

If you're keeping track, that is 8 different slight tweaks on how you want your FD3 treble to sound. My personal preference is the balanced nozzle and the pro cable to enhance that balancing.

Folks that are treble sensitive would do well to change out the treble filters for their balanced filter. Then when you add the highly resolving Pro cable. Now we are talking. You can always increase the definition of a well balanced tuning but to use a highly resolving cable to enhance a bright treble tuning is a no no. That was my real gripe from both their FD5 and even more so the FH5s.

So is it worth getting the pro version just for the cable? YES it is. The pro cable vs their base model copper cable enhances detail, imaging and stage. Once you hear the balanced configuration with the pro cable and back to their copper cables. That little bit of enhancing ability is lost and therefore it is something you can’t get back once you go back to the stock copper cable. It is the difference between a slightly warmer smoother tonality to a more resolving with better imaging for the FD3 sound that easily approaches their own FD5.

However the stock monocrystalline copper cables are by no means just a throw in. What this cable does is actually makes the treble filter listenable for maximum sparkle and shimmer. While still having more treble presence for folks that want a bit more treble presence and bite than the balanced filter try using their base cable with the treble filter it actually matches better than their pro cable. Whew. I know that was a lot of information. Just know the real value is with their pro version is that it includes a cable that matches extremely well to use with that balanced nozzle. If you own a variety of higher end aftermarket cables you might be better off just getting the base model and using what you have.
Just know the FD3 scales incredibly well with better cables.

Mids and bass for the most part are not too affected with the filter change but it does affect their tonality to be slightly brighter to warmer depending on what configuration you are using. Mids here I found to have better balancing from their previous FD5. Rich in tone with a good note weight to the sound. Mid bands have really never been an issue for Fiio tuning. FD3 for vocal performance is very good with excellent range and space. Has an above average sense of dimensions to the sound at the price range and stage to its sound giving the mids the room it needs to fully portray a variety of music types. In fact due to the well balanced signature of the FD3. It can do rock and metal music just fine with gusto to spare. Not something I can say was possible on their previous FH5s. More versatile than the FH5s while having just a good mids performance again using the pro cable.

Bass for all Fiio earphones has been a strong point for their tunings and the FD3 does not disappoint. Never heard a neutral Fiio earphone so bass is always a part of their house sound. Music is not music with a gimpy bass end and here the FD3 performs excellent. While their FD5 and FH5s both take on a bit more dense, more textured deeper bass ends, the FD3 is most definitely satisfying for bass. Bass has got a good solid impact for mid bass and shows a deep reaching rumble when called for for modern genres of music. Speedy punchy for faster metal music and well textured sub bass for hip hop which shows its versatility.

The bass end is well rounded in form and shows good detail in the region much like their previous higher end offerings. Your perception of bass might change a bit based on which nozzle filter you're using. The balanced filter, might seem like you're hearing a bit more bass presence but really the only thing that filter changes is the trebles. The bass end is very good at their given price point as I have never heard a carbon based dynamic not do well for bass actually. Graphene, Carbon nanotubes, carbon coated all of them. Tuning is different for them all but weak bass is not a part of the carbon based dynamic DNA.

Its technical ability is a stand out as the stage is wider than your average dynamic earphone and with that wide stage has very good fullness with a good sense of body and note weight to the sonics portrayed on the FD3. The resolving ability of the 12mm DLC dynamic is evident with a very well imaged portrayal of your favorites. The mids have good fundamental spatial layering, timbraly accurate but is slightly smoother and warmer in tone for a more natural sound presentation than anything edgy or sharper in tone compared to something like how BAs present your tunes. Sound separation and imaging is above average here in performance add to these aspects absolutely zero issues with coherency for both tuning nozzles.

In the end.
If you think Fiio doesn't read and listen to criticism from enthusiasts about their earphones you're wrong. There are direct design elements for their new FD3 that was suggested by the numerous enthusiasts on the threads and I have personally suggested the addition of a copper cable from my previous reviews and they did so on their new base model. For that I have to say thank you to Fiio for considering the end users needs and wants in a sound design. I applaud Fiio in what they have achieved for their new FD3. I am all too happy to report just because the price tag might indicate these are possibly a lower tier of earphones than both their previous efforts. Nope, give me the FD3 all day long it is exactly what Fiio needed to right the ship. Not only is the design taken from their previous successful FD5, it is an actual improvement in tuning but at a 1/3rd the cost to own an improvement? Wait, that don’t happen in the earphone industry does it?

Fiio just did.
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A very nice little set of iems here, highly recommend. Pro version is definitely worth the extra for that cable too !
Excellent review! Thanks for taking the time to write it. 😊
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Great review and interesting set of pictures!
Thanks for sharing
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