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Fidue A73 Hybrid Monitor Earphones with universal single button remote and microphone

  1. frederickchr
    One of the best crisp sounding
    Written by frederickchr
    Published Jun 11, 2016
    Pros - Superb sound quality, fitting, Imaging, build quality
    Cons - No chin slider (same with old batch of A83)

    Firstly I would like to thank Michael Lin from FIDUE for giving me this sample to review. I am not affiliated with any people inside FIDUE so this is not on promotion purpose. This is a full product (not a pre production), so it’s full of its accessories and final packaging. This review is done after having over 50hrs of burn-in and small changes were noted. Usually balances armatures are not prone to burn-in, but it might have worked to either my subjective assessment and to the driver.


    This review is a full subjective assessment which might differ one another. My Favorite IEMs are the lineups of Final Audio Design Heaven series and I also enjoy other IEMs as my daily driver. Those IEMs are Ultimate Ears 700, Shure 215 SPE, JH5 CIEM, and big brother of A73, A83.

    Here’s the tech specification of FIDUE A73

    Driver : Dual hybrid (10mm Exclusive Woofer Dynamic + single BA)

    Frequency : 13-27,000 Hz

    Impedance : 20 Ohm

    Sensitivity : 107dB

    Max input power : 20mW

    Distortion : <1%

    Plug : 3.5mm stereo, Gold plated

    Cable length : 1.3m

    Sensitivity of mic : -42 +- 3dB

    S/N ratio of mic : >55dB


    At first these may not seem like they're well built especially the plastic housing part. It’s combination between plastic and metal with brushed nickel or aluminum finish. After longer period of use, this IEM feels solid and the cable quality is good. Designs are always a preference thing, but in my opinion these looks nice.



    This IEM gives very comfortable fitting. It’s easily worn and get the best fitting although it must be worn over ear. Once it’s plugged on ear, it’s hardly for normal use to get the IEM to loose from your ear (I tried to shake my head tho, and it’s not moving). It differs with the A83 which is hard to get the right fit, depends on the eartips used and somehow A83 is uncomfortable, at least for my ears.



    Same with other Hybrid IEMs, this A73 have vent for the dynamic driver which will somehow reduce the isolation.



    Leather case, 3 pairs of eartips SML, 1 pair biflange eartips, shirtclip.



    At first chance of trying this A73 (unburnt), the thought that came out was “seriously? It can easily outperform any IEMs Sub 200$”. The presentation of the sound is somehow can be said: CRISP. From low end until the high frequency it feels so crispy with slightly boosted in treble. Compared to A83, it feels more calm, not as aggressive as A83, but somehow the soundsig of A73 has more fun.

    Here’s the song that I usually use to compare HeadGears, and also the songs that I listen everyday might be similar to these genre:

    Assimilation - Olivia Ong

    Somewhere - Jackie Evancho Ft. Barbra Streisand

    Angel - Jackie Evancho

    Great Big Storm - Nate Ruess

    Some Nights - Fun

    What I Did For Love - Josh Groban

    American Eulogy - Green Day

    Ink - Coldplay

    Austin - Blake Shelton


    The Bass, especially from the dynamic driver can bring enough quantity without overboomy. It can be brought into the fast paced bass and has great attack and impact. The presentation of the bass is forward, present, and lush without overwhelming the other part.

    In one thought: very accurate bass



    What I expect from IEM with balance armature driver is sophisticated mids. And it is what A73 brings and presents. The mids, especially vocal, brings a bodied sound signature with clear impression. It is somehow rich in the low-mid and a little dry in the upper-mid. Maybe for some, it will be too droughty. The mids dont come across as lush as some high end IEMs ($500<), but still presents clean and clear, vocals both male and female are detailed, pianos and guitars still have power and crunch, acoustic guitars have great body and decay. The separation is world class and the detail is superb.


    For bright sound signature lovers, this A73 will be your favourite. The presentation of the highs is very extend and sparky. After 50 hours of burn in, there is no presence of sibilance. High part also oftenly used by people to compare the resolution and detail of a head gear. The detail of the highs is even better than the lows and mids, as I said that it brings crispy impression. It’s not just crispy, but every detail and every instrumental in the music can be presented clearly and accurate. Although from my explanation it might seems that the highs can be too harsh and can be fatiguing for us, the fact is there is no harsh at all in letter S. I can say that it’s one of the best highs that I ever use.


    + : Superb sound quality, fitting, Imaging, build quality

    - : No chin slider (same with old batch of A83)

    Overall, FIDUE brings new level in Sub $200. Any other manufacturer can hardly beat this IEM especially if they try to use the same sound signature. The soundstage also airy and brings top notch imaging. One last thing: FIDUE A73 is one of the best for me in the price range of under $500. About my experience about this product, FIDUE give a very good service to the customer and brings change to the product based on what customers want.

  2. suman134
    Not my cup of tea.
    Written by suman134
    Published Oct 6, 2015
    Pros - Details, Mid range clarity. Build quality.
    Cons - Fluffy bass, some elevation it the upper mid and Lower highs. Should come with a pair of Comply.

     Since last year, Fidue a Chinese earphone manufacturer has been raising its head with some hard to look through earphones. They have close to 10-12 earphones but a triple driver hybrid, Dual BA single dynamic earphone A83 grabbed everyone’s attention and was received well by reviewers and users. Inspired by its success Fidue introduced a dual hybrid earphone A73, which I will review here. It come in a single color and is priced $149 or rs10k plus in India, it has been received well by reviewers, I will find out if it’s a good fit for my taste or not when I will pit it against DUNU- Ttan-1 and Brainwavz R3.
     Let me clear that this is my first Fidue earphone. And if you don’t know, Fidue stands for:-
    F - Fidelity Natural original voice of high fidelity.
    I - Inspired the resonance of soul.
    D - Durable Long-lived quality.
    U - Unique the unique design.
    E - Enjoyable enjoy happily.
     Let’s get started!!
     Before that I would like to thank HiFinage for doing this Indian review tour.
     Here is the link to the page.


    Now this package is really simple. Just 4 pairs of tips, S/M/L single flange and a Biflange tips. I would have liked it if there were a pair comply tip for every reviewer. There is a nice looking zipper case with Fidue written on it. There is a cable clip thankfully, nothing fancy. Earphone does look nice, red inside and silver outside, I like it.
     And about ergonomics, it’s a mixed bag for me, I didn’t enjoy its thick and bulky size, not as ergonomic as AN-16 for sure, its wasn’t so comfy even when compared to dual drivers earphones like ath-im70 or R3, you can wear AN-16 or R3 cable down too, this you can’t.
     Splitter is pleasantly small thankfully. I like those cables too, thick enough, strong and supple too, are not bouncy. Build quality is good for an earphone at this price, outer shells are metal and inner side is made of plastic, sadly stress relievers are not supple but serves its purpose of protecting the cable, but i didnt like that straight 3.5mm jack.
     Isolation is good for this over ear type fitting, microphonics is not bothering too. Use the cable clip to keep the wire in place.


     This earphone comes with a universal one button MIC unit which works with apple and android phones flawlessly. Thankfully its button is protruding enough and easier to operate unlike Piston 3, whose remote unit is difficult to get a hold of. A73 has nice clarity. Person on the other end had no problem hearing me. In comparison MIC clarity is better than most earphones.
     Operating is as usual for one button remotes, single press picks and ends calls. If not on a call, single press will play music and another press will pause it, double and triple press results into skipping tracks forward and backward respectively. Easy and simple to operate, sadly you can’t control the volume from remote.
       Lets see how this earphone sounds.


     Now the setup is a dual driver hybrid, a dynamic driver takes care of its bass department and a BA driver takes care of its mid range and high frequencies. It’s a bassy sounding earphone, with some elevation in its upper mids or say lower highs. The signature is warm and dark. Slightly V shaped when compared to R3 or q-jays with big bass and leaner mid range.
     I used the whole Capital cities and Clean Bandits latest album with some Eminem tracks, some Bullet for my valentine with some James blunt songs. Tips were stock single flange large ones. These did sounded better with Brainwavz Triple flange tips, wide bore tips and shure tips but I won’t be accessing its sound with them as they don’t come out of the box.
     I burned this earphone for Close to 50hrs as it was already burned by other tour participants.
     Let’s start with LOWS:-
      This bass has nice body and rumble but it’s not the type of bass I like, it’s obviously elevated, its muddy and decay is slow until I used decored shure tips, but we are on stock tips here. Fidue won’t ship with shure tips will they? Not a comply pair, leave shures alone, it’s not bad but not for those who don’t like slow fluffy kind of bass. What I liked is that bass is detailed, and will give a nice listening experience to those who like this type of bass. It goes boom and stays there, moves air, shows muscle power with rumble and slam too.
     As I mentioned earlier, bass lacks speed and aren’t precise enough doesn’t matter what tips you use. Sadly it lacks some sub bass presence and bass slightly of bleeds into the mids, even a $30 earphone like Brainwavz Jive does better here with their Comply tips!!
     Man, I hate this bass. Simple, coming from Jive, A151p 2nd gen and q-jays, this bass simply lacks control, details is good and that is the reason why I wont stop myself recommending it to those who like big bass.
     MID RANGE:-
     Now this is the best aspect of this earphone, if have ever read my review you know that I love mids, and this earphone is really nice with mids. Nicely detailed, has some body to it, doesn’t sound lean like A151p 2nd gen. I loved its instrument clarity and precision here, its really good.
     Vocals are really nice, clear and engaging, male vocals sound meaty and good, female vocals sound better and more focused. Notes are on the thicker side, imaging and presentation is really nice. Retrieval of micro details is 2nd to none in its price bracket. But for clarity and pure engagement of mid range, SHE9850 beats it.
     Clear, detailed and cohesive will sum this mid. I like this type of mid range.
     Stage has better height and width but lacks depth when compared to RE-400 and is clearly smaller than Titan-1 in every aspect, still better than XBA-H1, E50 and XBA-c10.
     First thing first highs lack energy that I lived with my pair of titan-1. Lacks some extension too, Fidue should add a bit more energy and extension. Thankfully details and clarity are not much lost.  Layering, separation, instrument placement are class really nice.
     Sadly there is sone lower high elevation, which makes some instruments sound more prominent and slightly bothering too. Thankfully some foam tips will bring it slightly down.
     I would have liked some more clarity which Titan-1 posses, still its better than XBA-H1, CKX-9 and similar to UE-600, which too lacks some extension.
     When against RE-400 these earphones lack some precision and sonicality. Not to mention that RE-400 has better extension.

     VS Titan-1:- Titan 1 has lesser amount of rumble but has enough and doesn’t lose control, has far better decay and clarity, details is better too. Mids are slightly more recessed but really well with micro details and clarity, sounds sweet!! Highs are the best you will find on an earphone in this price range, sparky, energetic and lively, seriously detailed.
     Stage is bigger too, ergonomics is nice but isolation is bad. Lacks MIC.
     Keep no doubt, Titan-1 is the better one.
    VS R3:- R3 is the most balanced one of these 3, bass is slow but still faster than A73, details and everything else is similar, thankfully don’t bleed at all. Mids are really balanced and detailed but lacks some bite, sounds slightly soft. Both male and female vocals lack some depth sadly. Thus makes it the most inoffensive sounding earphone of the lot. Highs have good extension and have plenty of details, don’t lack energy too.
     Sound stage is bigger, better depth, height and width, isolation is similar, has a better cable and sit is more secure. Sensitivity is slightly low.
     R3 slightly edges past the A73, doesn’t have a MIC though.


    There wasn’t a wow effect, but it was nice with foam tips, I hope it had one out of the box. To be precise, it’s not an earphone for guys like me who don’t want that much of bass and life highs, bass lovers will like this earphone more. Thankfully mids do saves the day as highs too were not impressive.
     MIC is a good addition and makes it stand out of competition with a feature not much seen on earphones at this price. Clarity is really nice too.
     There are not many earphones with mic and has clarity like this, those who like to use their mobile device more than their PMP should prefer this over others like Titan-1 or R3.
     But for self proclaimed purists like me, this is not the preferred earphone in its price range.
     Thanks for reading.
     Cheers have a nice time, enjoy!!


    1. View previous replies...
    2. suman134
      Thanks mate, i was kind of harsh at this, i was genuinely not impressed by A73, and didnt wanted to sound even more harsh by saying " i dont understand what the hype was about" as i know there are people who love bassy earphones.
      And Nope, I have the H1 and the word is that A1 is not different enough so i didnt went for the A1.
      suman134, Oct 7, 2015
    3. vaibhavp
      well, i dont get hype around any iem that i tried, be it hifiman re400 or havi b3. 
      all of them are great iems at their respective price points, and thats about it. same is true A73 as well. 
      vaibhavp, Oct 7, 2015
    4. suman134
      Thats what i am saying.
      suman134, Oct 7, 2015
  3. krishtrinity1
    Fidue a73 Initial impressions
    Written by krishtrinity1
    Published Jul 27, 2015
    Pros - Audiophile quality,soundstage,treble detail,value for money,build
    Cons - over the ear design maybe hit or miss,constantly readjusting for better fit,well,you can't have everything i suppose
    My priority when i am buying a audio gear is value for money and Fidue A73 comes in the insane value category,although it is still early to tell if it's the best inear at the price because i just got this earphone.Although what the Fidue lacks in features and some minor hiccups,it more than makes up in audio quality,in my last review i praised the vsonic vsd 5 for it's incredible performance for the money the fidue is almost double the price and even before it's burned in i can say that it easily justifies the price.Will go into more detail in the final review,here are impressions of some of the songs i tested with the Fidue A73
    Played with Jriver media center with wasapi output,Schiit modi DAC and fiio E11 set at two and a half quarter in volume dial.
    Victory song(320 kbps)-Ensiferum
    What better song to test the limits of a earphone than a folk metal song,to me if any earphone can play this song even moderately good they are worth buying,my ath m40x absolutely destroyed this song because it sound so compressed,i enjoyed listening to this song with vsonic vsd 5,it had good sound stage enough to tell where tell the instruments in the song apart and trust me that is greatest compliment i could give it to vsd5,if you have heard this song you will know what i mean.Fidue A73 is on another level compared to vsd 5 any hint of harshness is completely disappeared,instrument seperation is wider,the sub bass is also present but not enough to interfere with the rest of frequency range.Overall i am very impressed with Fidues performance,can't think of even one negative thing to say after hearing the song with the Fidue.
    Lonely Boy(320kbps)-The Black Keys
    Once again can't find anything negative to say,absolutely wonderful soundstage,vocals are not recessed at all,crystal clear highs,maybe a hint of sibilance but can't say for sure,bass is punchy.I can see the benifit of dual drivers if you listen carefully you can tell the audio is coming from 2 drivers but it just add to the immersion
    At this point i can't concentrate writing this post when i am busy headbobbing to this rock/hip hop song.I can clearly tell where each and every instrument is placed,where the vocals are coming from,the violin is clearly heard from the right doesn't even remotely interfere with the vocals or drums.Think i am going to listen to the entire Flobots album after this post
    I am only Joking(320kbps)-KONGOS
    Absolutely love this band,they only have a few songs to their name by my knowledge but they kick ass.We can clearly tell apart the unique mix of drums and vocals.I am busy head bobbing to complete this so..if you get this earphone you should hear this song.
  4. T.R.A.N.C.E.
    Energetic and big hitting
    Written by T.R.A.N.C.E.
    Published Sep 5, 2015
    Pros - Keeps all frequencies in check while providing large scale sound
    Cons - Will be a bit overly bombastic for some people, not for mellow music or relaxing.
    I will mainly be comparing to A65.
    Build of these is excellent, but not quite as nice as A65 due to the half plastic housing. It is of very high quality though, it shouldn't affect durability.
    The bass hits way harder than A65, but is also faster compared to the slower thicker bass of the A65, It's a tie for me, I like some aspects of both bass performances, my ideal bass would be right in the middle of both styles. The mids on A73 are clearer and better separated than A65, but also thinner, male vocals sound better on A65 while female vocals sound better on A73. The treble of A73 is more detailed and better separated than A65, I prefer treble of A73. The sound stage of A73 is also bigger and airier than A65.
    Overall a good number of improvements in A73, but A73 also has an overall bombastic sound, while A65 is more mellow, so it will come down to preferences imo.
      DJScope likes this.
    1. DJScope
      Great stuff!
      DJScope, Sep 5, 2015
  5. wrathzombie
    Surprisingly good Hybrid Experience
    Written by wrathzombie
    Published Jul 29, 2015
    Pros - Build Quality, Instrument Separation and detail retrieval, Handles most of the genres well
    Cons - Fit can be a bit tricky, Source dependent?
    First of all I would like to thank Hifinage (http://www.hifinage.com/) for arranging a review tour and sending this to me. They are really stepping up their game and slowly increasing the product offering, which for us Indians is very good. I am not an expert reviewer and the opinions mentioned are purely subjective on the basis of audio gear that I have available with me at this point of time.
    Source: AV RX-375, Fiio X1, Huawei Honor 6.
    File Format: 320 Kbps, Flac
    Packaging: The packaging, is pretty straightforward and functional. There is a carrying case included with four set of tips. I would wish, there were a few additional tip choices (maybe a pair of comply)
    Build Quality/Features: It is solid and overall it looks that a lot of effort has gone into the design of these earphones. Cables are rubbery, yet seem fairly strong and tangle proof. No chin slider, however, a shirt clip is included. These can be worn, only over the ear so  micro phonics is very minimal. The cable is not very long, and the perfect length for portable use. An in line mic is present which works pretty well out of my Android phone(it only consists of a mute button). Strain relief also look very solid. 
    Fit: I think Fidue, have put some effort in making a low profile iem, which fits over the ear. However, it is not very easy to get the perfect fit. I had to use the biggest tip to ensure, they were sitting snugly within my ear. I think this would be one of the cons for these iem. The sound is fit dependent and you might not be able to enjoy them 100 percent unless you get the right fit. Also, I don't think they can be worn, straight down.
    Sound: This is the first time, that I am trying a hybrid iem and it did lead to a few surprises. Instrument separation is awesome(which led me to hear a few sounds, which I had not heard before. For eg: the song Vampires - Antsy pants has an egg shaker in the background which seems prominent), Bass goes deep(but not too deep), Mids are forward so vocals really shine. Also, I could slight separation on how the sounds were produced. I am not saying, there is something off with the tuning, but since I have experience with only dynamic earphones, maybe I found them a bit different. 
    To be frank, they were not really great out of my Honor 6 or X1, which makes me think they need an AMP to make them shine and so I plugged them to my AVR and the sound was surprisingly more cohesive. I wish, I had my Fiio now because that would have certainly helped. Overall, they seem to work for Electronica, Pop, Instrumental, Jazz but not really for extreme metal. Since, most of my listening consists of Death, Tech Death, Black Metal I am not sure these earphones are for me. One thing to note would be, that if you like slow instrumental music, for eg the song: Isis - Shakti, you can really hear how each instruments are slowly coming to life as the song goes on, the song starts with an acoustic guitar piece, and then the tabla starts and then the violin joins in. The 3-D like effect you get is really good. I hope I am explaining things correctly. Now, the problem I got with my Honor6 and X1 is that the treble sound a bit plasticy and piercing which makes it a little fatiguing. However, the same issue was not there when I plugged them to the AVR.
    Final Words:
    The iems are pleasantly surprising and do a lot of things with aplomb. The detail retrieval and instrument separation is top notch, however they are not an all rounder which would work for all types of music. However, if you like pop, electronica, instrumental, jazz, and even rock you should definitely give them a shot. They also, seem to be a bit picky on the source component so I am not sure, if they will work well out of your phone directly. Maybe, I need more time with them, because after listening to a lot of dynamic iems over the last few years, my ears need time to adjust to them, but sadly these are review pieces and have to go to  the next reviewer.
      ayaflo likes this.
  6. angelo898
    great value
    Written by angelo898
    Published Dec 6, 2015
    Pros - great sound
    Cons - little negatives about this, but the aesthetics are probably the biggest negative for this IEM, showing how little negatives there are.
    Fidue A73: just pure value
    I received the fidues in October as part of the Australian tour. Despite life having caught up with me because I evidently was not able to escape quickly enough, I did manage to take pictures and make several notes on this before handing them back. I tried this for a week or 2, while also letting other people who happened to hang out with me try them out. After a short road trip where my friend used this IEM for a few days, he loved the IEMs so much that he ended up purchasing the fidue A73. Do note that I received the a65 as well, but wasn’t as impressed with them since they didn’t have as much highs as I liked.
    A little about me
    Personally, I am a person who tends to gravitate to high end equipment, but have recently started looking at the low-mid end segments of the IEM world, since I have come to the conclusion that I have had my head stuck up in the clouds for too long. While I love trying new equipment, the equipment I end up buying tends to be little. This might be due to my lack of a decent income, or because I have very high standards, honestly I am not sure. However, one thing I am very sure of, since I have a rather limited budget, whatever I tend to buy or recommend are things I love, instead of hyping the regular item. While I believe sound quality to be extremely important, I also highly value ergonomics, and love things that look beautiful as well.
    I personally feel that fidue did a great job in terms of designing this IEM. While not perfect, it really is very good for the price.
    Starting off with the shape of the Fidue A73, I personally like the obvious over-ear shape of the iem, along with the lack of memory wire on this. Having no memory wire built into the IEM allowed for an unimpeded experience when putting on or taking off the IEM, which is something I loved. The relatively smooth wire also allowed for long uses without any discomfort in my ear or on the ear, while the shape allowed the IEM to easily stick inside my ears, which seems to be a problem for me for certain IEMs which aren’t shaped very ergonomically. This IEM falling out issue has been a huge problem for me, forcing me to end up not being able to use the Fitear range of IEMs, as well as the a65, for long periods of time since they would just fall out randomly.  The y split on the A73 is also a very beautiful custom made one, instead of some of the cheap rubber shrink tubes that are common among smaller companies nowadays.
    However, there were several other features I disliked. Despite being very ergonomic overall, I was disappointed that there was no chin slider built into the IEM. I am assuming that it was a design choice to sacrifice this to make space for the microphone remote, since having both would make the user look a bit funny, but since I don’t use that feature, I would just like to point that out. The unit also features a very nice overmold and good strain relief on the various weak points on its cable instead of having a removable cable. This is both a good thing and a bad thing since non-removable cables allow for the user to not worry about swapping cables, and is quite common among low-mid end IEMs, but I am very clumsy and that is definitely an issue for me.  The ear tips are also quite hard, and are not something I would use if I were to buy this IEM.
    Several users have pointed out that the straight plug is an issue, but I personally feel that it is not a big deal and is something that is quite common in all types of IEMs, from cheap to expensive.
    A relatively recent trend that I am seeing is low-mid tier IEMs are starting to become genre masters, while high end IEMs are starting to venture into excelling in certain types of music, while being adequate in others. This is something I wholly support, since it can easily be assumed that high end IEM purchasers have enough disposable income to purchase multiple great IEMs, allowing them to have a good balanced set.
    The Fidue A73 follows this trend with its hybrid design. This means that it possesses the bass of a dynamic driver, in combination with the details that balanced armature drivers have. The tuning that the A73 has adds onto this with a very slight bass lift, warm mids and smooth, crisp highs. Not much seems to be overdone to my ears. Since it is inoffensive in various segments of sound, it plays well with all genres of music. Let me break this down in further detail.
    Treble for this IEM is not super elevated. There appears to be a nice spike in upper treble that gives the appearance of an open and detailed sound. The spike is a small one, since the A73 is not fatiguing in any sense of the word, allowing the use of it for long hours without needing to stop. There is also no sibilance detected, with no harsh sounds relating to the letter S or cymbal crashes.
    The midrange is something I found to be of particular interest, with a nice combination of warmth and resolution. There is a sense that the upper midrange is brought forward, giving a sense that vocals are put in the Center stage on most of the tracks I tried. This made the voices sound very natural and beautiful. This is coming from a person who owns a Noble Audio K10, which has one of the most beautiful mids that I have ever heard (while it is not on the same level as the K10, the fidue A73 is very good indeed).
    The bass on the A73 is quite nice indeed. This is probably due to the dynamic driver that is contained in the A73. The bass I heard was forward and present, in good balance with the music that was played with no problems with speed, while also not having any problems with being slow. 
    The A73 is an open sounding IEM. I did not feel very out of place with this IEM, despite being used to the soundstage that my higher end IEMs usually presented. This is probably due in part to the way the highs are tuned.
    I tried this IEM with several sources, namely the iPhone 6+, the Calyx M, the Resonessence Labs Concero HP and the Cozoy Aegis (with computer and iPhone). I personally felt that the A73 excelled as a portable audio source. I thought the pairing with the iPhone 6+ was good, but lacked a bit amplification. Adding the Cozoy Aegis to the equation aided this by quite a bit by giving the needed amplification into the fidue A73. The Calyx M pushed this even further, with its good DAC. However, it didn’t seem to scale any further than this. It must be said that at that point, the effects of diminishing returns have set in long ago, and most of the target market of this IEM would probably not be investing into gear past the budget of the Cozoy Aegis, which meant that it was more than adequate.
    The packaging on this IEM was pretty good, with a box, some normal silicone eartips (S/M/L), a set of double flange eartips, a removable shirt clip and a hard carrying case. This, in my opinion, is adequate, but quite sparse. Personally, I would get some aftermarket eartips for this IEM, which would be a cheap upgrade that would probably be easy for most users (my friend who ended up buying this IEM prefers foam tips with this).
    This IEM seems to have been made to look iconic. With its red and grey colour scheme, it is slightly different from the usual black and/or silver that is commonplace in the IEM world. However, some people would find this cheap and not classy like what the silver and/or black scheme tends to invoke. Additionally, I personally felt that the A73’s plastic housing was not cut particularly accurately and this contributes to the slightly cheap look of this IEM.
    In conclusion, I came out of this tour being thoroughly impressed by this IEM. This was one of the few revelations that I’ve had in the audio world, where a low or mid –tier IEM or source has impressed me thoroughly. The last time I have felt this was the Hifiman RE400, which had quite the amazing reputation. I can thoroughly recommend this to anyone who is looking for an IEM in this budget. With the price, it is also quite the entry into the audio world and the fact that I didn’t influence my friend in his decision made the abilities of the fidue quite amazing indeed. 
      Hisoundfi and DJScope like this.
    1. DJScope
      Thanks for joining the tour, mate!
      DJScope, Dec 6, 2015
    2. Sethivict
      Nice review mate
      Sethivict, Dec 7, 2015
  7. mellowjamie
    Great sounding IEM for first timers
    Written by mellowjamie
    Published Nov 6, 2015
    Pros - Soundstage, detail, warmth, bass
    Cons - Not the most interesting looking, poor accessories
    I bought these IEMs to go with my new FiiO X5ii. Thanks to the guys at hifiheadphones.co.uk for their advice and quick delivery.
    I also had the RHA T10 delivered at the same time, so it was interesting to compare a hybrid IEM with a single dynamic driver earphone.
    Packaging 7/10
    Outside: A matt board box with spot UV
    Inside: Form product holders
    Apple all but revolutionised how we perceive electronics packaging, regardless of what they were packing inside their boxes. The Fidue packaging is on a par with FiiO's - functional and Far Eastern. It gets the job done, but a lot more effort could be put into improving the customer journey with this aspect.
    Accessories 5/10
    A S/M/L silicone tips, a very small carry case, M double flange silicone tips, ear guides, cable clip.
    In comparison to the accessory laden RHA T10 that I also have, Fidue have let themselves down in this area. The RHAs have a lovely soft case and more tips than you could hope for (arguably this is because the RHA T10 are more difficult to get a good fit so the tips are needed). I'd like to have seen a better case that this, but I can forgive based on the other merits of these IEMs.
    Fit - 8/10
    Out of the box they fit nicely. This was without the ear guides or messing with tips. I changed the tips to the small size and fitted the ear guides and they fitted even better. They also didn't change their sound based on the tips, which was interesting after my experience of the RHA T10.
    I was surprised not to see any foam tips, but I'm told that the Comply T-200 tips work with these IEMs should you not like the included silicon tips.
    Comfort - 8/10
    Once they're in, you don't really know. I wear glasses, so you can feel them touching the glasses, but it's definitely not a deal breaker, and I suspect that anyone who wears over the ear IEMs with glasses will encounter some issues.
    Isolation - 8/10
    Well I wear them at work and can't hear anyone talking. Which is a good thing. They do a good job, for universal IEMs, of isolating.
    Microphonics - 7/10
    The myth that over the ear means no microphonics just isn't true - there's some noise, but nothing too bad.
    Design - 5/10
    As someone with a design background, man these things are ugly. A side by comparison with some of the more attractive IEMs available from the likes of RockJaw, DUNU, RHA, Westone and Aursonics, the Fidues look a bit, well, "meh". I'm not a fan of burgundy, and the grey makes the look unfinished. The nice touches are the metal Y joint and plug but again, the RHA T10 is just so much nicer to look at and touch. A real shame. I'll call these "utilitarian" in appearance. 
    Overall Sound First Impressions - 9/10
    Wow. After the just above average packaging, moderate accessory pack and "meh" design, I knew something had to impress - just as well then it's the sound. The second I started listening to them and went through my usual list of tracks that I use to gauge equipment I found myself just enjoying the music rather than critiquing the earphones. They're not perfect, and for £90 I wouldn't expect them to be, but they are pretty close for the cash.
    Detail - 8/10
    There's oodles of detail coming from the Fidues. It might be a cliche, but I found new subtleties in my music that I hadn't heard before, and thanks to the soundstage (more on this later) I was hearing stuff I'd heard before but in different places. There's just so much more information in the music now, whether that be breathing, guitar strums, symbols, subtle electronic noises - it's just there in so many layers. The word I'd use is "revealing".
    Soundstage - 8/10
    Again, a big surprise. I was expecting a bit of width, but understanding that these are closed IEMs I wasn't expecting miracles. Instead there is both a width and depth to the soundstage that is extremely entertaining. Massive Attack's Teardrop had me mesmerised. 
    Bass - 9/10
    The A73's party piece, if it has one, is it's bass. This is not bass-head bass, this is tight, controlled, musical bass. There is an ever-so-slight roll off in sub bass in Daft Punk's Lose Yourself to Dance but nothing that I could notice and these things go low. It never feels too much, it never feels slow and it's never at the expense of the rest of the frequencies. It's a lovely, warm, textured bass that just makes the music enjoyable.
    Mids - 8/10
    The A73 is an all round performer, and it's the mids which are slightly less capable that the bass or treble. There's an ever so slight "V" shape to the sound, and the mids are recessed just a little. Having said that, it's such a warm sound signature that it isn't detrimental to the overall sound of the earphones - the treble isn't overly bright so it's not like the mids go missing in action. They're there, and they're not obvious and in your face, but they are wonderfully textured and make male vocals a joy to listen to. Ed Sheernan's vocals in Photograph are smooth and layered, also mesmerising.  
    Treble - 9/10
    Smooth and detailed. Never fatiguing or bright. May not be to everyone's taste, but I like to hear the details without feeling like my eardrums are being pierced, and the A73s don't disappoint here. Carol Decker's vocals in T'Pau's Secret Garden can be extremely bright and painful, but the A73s manage to smooth over the highs whilst still providing sparkle. 
    Noise Floor - 6/10
    Well look, they're IEMs. They have a relatively high noise floor. The FiiO X5ii does a reasonable job of keeping it to a minimum, but listening to say Spotify on a MacBook using a FiiO E11k it's still quite high. It's not *too* high - but you can hear it. For those who like hiss free music, these probably aren't the boys, unless you're happy looking for an IEM amp to reduce this.
    Overall - 9/10
    Very happy. Lovely sound that is just enjoyable. I'd not call them reference, nor are they consumer. They sit somewhere between - just thoroughly musical IEMs that need looking into if you're in this budget.
      DJScope and HiFiChris like this.
    1. DJScope
      Nice review. Just a little head-up, driver don't have a "noise floor" as they don't produce noise themselves. What you mean is "sensitivity", or how susceptible they are to low level noise.
      DJScope, Nov 6, 2015
    2. mellowjamie
      Thanks for the heads up. :)
      mellowjamie, Nov 7, 2015
    3. sharam
      so which would u prefer, the rha t10 or the fedue a73,im planning to get either one,i prefer a lil more bass 
      sharam, May 16, 2016
  8. HiFiChris
    The Best of two Worlds
    Written by HiFiChris
    Published Sep 18, 2015
    Pros - well-made sounding, bass body, resolution, value, no microphonics, very fast and arid dynamic bass transducer, fit
    Cons - no chin slider

    Before I start with my actual review, I want to thank Fidue and especially Michael Lin for providing me with a sample of the A73 in exchange for my honest opinion.
    Please note that I am not affiliated with Fidue in any way.

    Benny Tan, Fidue’s chief engineer, has got more than 20 years of experience in developing and producing premium headphones and has already designed several products for some famous brands in the past, so says the text on the back of the A73’s packaging.
    That the team around Benny Tan and Fidue are no rookies in the audio industry becomes obvious when one starts listening to their products, such as the A73, but I’ll get more detailed further below in my review that also features some comparisons with dynamic and Balanced Armature earphones in about (more or less) the same price range.

    Technical Specifications:

    Driver: 10 mm Exclusive Woofer Dynamic & Balanced Armature Drivers
    Frequency Range: 13 – 27000 Hz
    Impedance: 20 Ohms
    Sensitivity: 107 dB
    Max. Input Power: 20 mW
    Distortion: <1 %
    Plug: 3.5 mm stereo, gold-plated
    Cable: 1.3 m
    Sensitivity of Mic.: -42 +/-3 dB
    S/N Ratio of Mic.: > 55 dB

    About hybrid In-Ears:

    As you can read from the technical specifications, the A73 is a little different from most In-Ears and doesn’t only use dynamic or Balanced Armature transducers, but combines both in one shell.

    Most In-Ears use dynamic transducers for audio playback which have the advantage of covering the whole audible spectrum and achieving a strong bass emphasis without much effort. Valuable dynamic drivers are often said to have a more bodied and musical bass that has a more soft impact and decay and lacks of the analytical character that BA transducers are known for. On the downside, in contrast to headphones with other driver principles, dynamic transducers often have a lower resolution.
    Higher-priced and professional IEMs mostly use Balanced Armature transducers, which usually have got a higher resolution than dynamic drivers, are faster, more precise and have got the better high-level stability, which is important for stage musicians that often require higher than average listening levels. On the downside, it is quite hard to cover the whole audible spectrum with just a single BA transducer and strongly emphasised bass is only possible with multiple or big drivers. Some people also find In-Ears with BA transducers to sound too analytical, clinical or cold (in several active years in a German audio community where I wrote multiple reviews, gave dozens of purchase advice and help, from time to time I heard people that got into BA earphones for the first time using these attributes for describing BA earphones, especially their lower frequencies).

    Hybrid IEMs unite the positive aspects of both driver principles and use one dynamic transducer for lows reproduction and at least one BA driver for covering mids and highs, wherefore the often as “musical” described bass character remains and the BA transducer adds resolution and precision to the mids and highs – and that’s what the A73 does with its technology. It is addressed to those people who perceive the clinically-fast character of BA transducers as unnatural, but want to keep the mids’ and highs’ resolution, speed and precision.

    Delivery Content:

    The A73 comes in a black cardboard box with a picture of the “illuminated” In-Ears on the front. On its right half are the model and manufacturer name including a short description with white text on green background, which I find unique and refreshing. The green colour, together with the “F” in Fidue that looks like a branch with two leaves, brings up associations of harmony, calmness and relationship with nature – but that was enough association for today. J
    Moreover, there is a chequered black pattern that gets visible in direct light and consists of the Fidue F and black squares above the Fidue logo on the front. The green band from the front continues on the bottom and has got the brief description from the front translated into Chinese and German, with the slogan “Original sound, beautifully voiced!” with Benny Tan’s printed signature beneath.
    On the back, there’s a picture of the four-pin 3.5 mm connector, a QR code with the serial number overhead and the technical specifications with a brief description of the company and Benny Tan on the right.

    Inside are the In-Ears, four pairs of silicone eartips (three pairs that differ in size and one pair of double-flange tips; the medium single-flange tips are already installed on the A73), a sturdy small zipper case, a shirt clip with the white Fidue logo on it, an unnecessary silicone cable tie (rolling it up with the fingers is in my opinion faster and better), a set of black silicone ear-guides and finally something that seems to be a warranty card.

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    Build Quality:

    The IEMs’ bodies are halfway made of matte-silver painted structured metal and halfway of semi-transparent red plastic, seem sturdy and have each got two vents. The straight connector, the y-split and the remote control are all made of finely grooved metal cylinders and have got red rubbery strain reliefs. Strain relief on the IEMs’ shells is also of superb quality and red, too.
    The sturdy premium tangle-free cable is very flexible and of greyish semi-transparent nature, wherefore the copper and silver coloured wires can be seen.
    Except for two small dust inclusions underneath the paint of the left shell, there are no flaws in the very well and sturdily built IEMs I received.

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    Comfort, Isolation:

    The Fidue A73 is intended to be worn with the cables over the ears, which is also my preferred method, as it improves fit, seal and comfort and drastically reduces microphonics. In this case, I don’t hear any microphonics at all, which speaks for the good cable.
    As there is no memory wire close to the IEMs’ bodies, two silicone ear guides come included, and I also use them, just like with my Phonak Audéo PFE 132, because the cable then also stays in place when I lay down. With the ear guides are installed, the IEMs barely fit into the case (there is not really any more space left then) and I have to roll them up tighter, but it is possible; without the silicone ear guides, they fit in easily.
    Because the IEMs have got an ergonomic shape and are worn around the ears, comfort is very good and the weight isn’t really high although the shells are halfway made of metal. The only thing that I miss is a chin slider, but I guess they didn’t include it because of the remote control.

    As the IEMs have each got two vents, isolation isn’t as good as with fully-closed competitors, but still clearly upper mediocrity.


    P1020637.jpg   P1020638.jpg

    In-Line Remote Control, Microphone:

    The single button in-line remote control works smoothly and without any flaws with all devices that support a microphone and remote control. The Button’s pressure point is rather high, but it is still easy to operate and not too stiff.

    Microphone’s speech quality is above average, with correct and realistic yet somewhat muffled voices, which can be tuned to sound clearer by turning the microphone towards one’s face.

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    The A73 received at least 50 hours of burn-in before I started critical listening (just in case that it has an effect).
    Source devices I tested with were my iBasso DX90 and the LH Labs Geek Out IEM 100; music material covered many genres and different speeds; files were stored as FLACs and MP3s (320 kBps cbr).


    A73’s tonality is generally a warmer v-shape, meaning it has got an emphasised bass and emphasised highs, but in contrast to a classical v-shaped sound signature which mainly concentrates on sub-bass, the Fidue has got an evenly emphasised low range with just a slight subbass roll-off and doesn't have a sibilant treble (to my ears).

    Compared to a mostly flat In-Ear monitor, the A73’s low range is evenly emphasised by about 7 dB, also including a (lesser) emphasis of the lower middle ground tone area, wherefore the IEM gains a moderately warm character in the lows.
    Transition from ground tone into bass is superb and even and doesn’t bleed into the mids.

    Midrange is tonality-wise pretty much correct in my ears, although high voices are probably just a slight tad brighter than they should be. Despite the engaging moderate v-shaped tonality, I wouldn’t really call mids recessed.

    Presence area around 2 kHz is a bit recessed, then level evenly increases again, with a peak at 8 kHz that I could locate with a sine generator, but it is not overly present and not harsh - it is just a bit above the ground-line and therefore A73 has got a rather warmer v-shaped tonality. Treble extension is quite good and although a BA transducer is used, there is not much roll-off in the super highs, with audible subtle sparkle above 10 kHz and still enough level at 14 kHz.

    Luckily, the dynamic transducer’s potential of creating a bloated bass with ease wasn’t abused but well-tuned to gain a present low range that is full-bodied, but not exaggerated and great for doing sports, low listening levels and traveling where loud outside noise masks the lows.

    Sound in general is very coherent and the transition from the dynamic bass to the BA mid-high driver is even, smooth and unobtrusive.


    The A73’s dynamic drivers’ bass is of the dry and punchy kind and totally free of any softness, bloat or sponginess, but is very precise and has got a dry and solid impact without losing the musical and dynamic body that is typical for dynamic transducers.
    In one evaluation, I read that somebody found the Fidue’s bass to be too dry and arid, but I think it is just perfect as it is in this configuration, as the A73 has got a smooth and unobtrusive transition between the dynamic and BA transducer that would probably have got lost if they decided to tune the bass softer.
    I just come out to say that privately, I am not the biggest fan of dynamic transducers for In-Ears and not many of them are convincing me, but the Fidue is one of the few In-Ears with (at least one) dynamic transducer where I have no criticism regarding bass quality.

    Typically for a BA transducer, mids and highs are high resolving, precise, fast and unveil tiny details with ease.
    Highs are very precise, differentiated and airy, although cymbals sound slightly metallic and unnatural due to the peak in the upper treble, but it’s not that bad at all.
    To my surprise, despite the (but more or less of moderate nature) peak, highs are never harsh, annoying or unpleasing, which is due to the pretty good resolution.

    The harmonic, coherent and engaging sound paired with the high resolution is just a lot of fun and very satisfying while listening with the A73.


    Soundstage is neither extremely wide nor extremely narrow, but in my ears somewhat wider than average.
    Spatial depth is present but of lesser amount than with some other dynamic and BA earphones (although not all BA earphones have got spatial depth). Layering in depth is precise, although some more expensive multi-driver IEMs (if they have got spatial depth) have got the slightly finer separation of single instruments in their depth layer.
    Instrument separation is, typical for earphones with BA transducers, on a high level, wherefore single tones and instruments are sharply separated from each other and have got a precisely defined place on the imaginary stage.

    In Comparison with other In-Ears:

    RHA T20 (Reference Filter: The Fidue’s bass is more arid, faster and has got less level and the better transition from bass to ground tone area. The RHA’s mids are more present, but the Fidue has got the better mids and highs resolution, unveiling more micro details. The RHA’s soundstage has got the wider and deeper expansion, but the A73’s instrument separation is superior and generates the better space between single instruments and sound elements.
    Victory of the Fidue.

    Shure SE425: The Shure is definitely the more neutral-ish sounding IEM out of the two and, due to its BA transducer for the lows, has got a faster and more arid impact, but lacks body compared to the Fidue. The Shure’s mids’ and lower highs’ resolution is better, but its upper highs sound unnatural and compressed due to the early treble roll-off, wherefore the Fidue has got the better upper highs and also the much better treble extension. The Fidue’s soundstage is wider, although the Shure has got slightly more depth. Instrument separation is just a tad better on the Shure’s side.
    Tie, more or less.

    Phonak Audéo PFE 132: The Fidue has got way less subbass roll-off and the better treble extension. The Fidue’s overall resolution is clearly superior, although the Phonak isn’t bad for a single-BA IEM. I never found the PFE 132’s soundstage to be successful, as it isn’t really coherent in my ears and has got gaps on both sides with unnatural sounding spatial depth. The Fidue’s soundstage is much better and coherent, and the A73 also has got the better instrument separation – the Phonak is a good single-driver BA earphone, but not more and gets easily beaten by the Fidue.
    Obvious victory of the Fidue.

    Etymotic ER-4S: That’s a little unfair, as I find the ER-4S to be probably the best single-BA earphone ever that even beats some dual-drivers. Sure, both differ pretty much in terms of tonality, as the ER-4S was tuned to have a reference-like approach with as flat as possible sound. ER-4S’s resolution is in my ears superior, but the Ety also beats some other, more expensive dual-drivers. Bad or mediocre recordings sound like cr@p with the Etymotic, as it has got an extremely analytical and revealing character, wherefore the Fidue sounds much better with mediocre recordings due to its less analytical character.
    The Ety’s soundstage is in my ears close to perfection with a very balanced width to depth ratio and a good instrument separation, although the A73 comes surprisingly close. The Fidue’s sensitivity is clearly higher, wherefore it requires less power to be driven, but is also extremely hiss-revealing, wherefore it requires a proper source with black background to unveil its full potential.
    Victory of the Etymotic (but it is overall my favourite IEM anyway).

    Fischer Amps FA-3E: This comparison is a little unfair, as the FA is much more expensive and has got a 2.5 way configuration, but the Fidue didn’t lack that much behind.
    FA-3E’s sound signature is more neutral, though it has also got a treble peak in the upper highs. The FA’s resolution is higher. Soundstage expansion is about the same with both IEMs, although the FA-3E has got the better instrument separation and therefore also the better perception of layering, wherefore its soundstage’s spatial expansion sounds deeper (although it isn’t). The Fidue has got the better bass body and you won’t like the FA-3E if you want that lows’ body of a dynamic driver (the v-shaped FA-4E XB has got a more “dynamic” bass body, but I will leave it out of comparison as it is a quad-driver IEM with three-way configuration).
    Victory of the (obviously more expensive) Fischer Amps.

    Summarised, I see the Fidue clearly above the Phonak, above the RHA and partly above the Shure, but below the Etymotic and Fischer Amps, but both are more expensive, too.
    The Fidue has got a great full-bodied, non-exaggerated, fast and arid low range with sparkly and high resolving mids and treble and great coherency and is just a hell of joyful IEM to listen to. It unites the best aspects of dynamic and Balanced Armature drivers and offers a great value for the money.


    The Fidue A73 could utterly convince me – it’s got the full-bodied bass characteristic of a dynamic transducer which is fortunately very arid, quick and controlled without any negative flavour, paired with the speed, clarity, air and resolution of the mids/treble BA driver. The overall package of sound, joy of playing and fun doesn’t really have any flaws. The only things that could be minorly criticised are the lack of a chin slider and a due to its peak slightly unnatural upper treble characteristic, but some other IEMs in my collection, also more expensive ones, have all in all got more flaws in their overall presentation/package, so it’s not really what I’d consider as criticism.
    Price-performance ratio is just superb and I think that it is extremely hard to find another IEM for the same price with the same technical level and the overall package and presentation, combined with the fun and joy of playing and with a bass that is strong and beefy, but not exaggerated.
    That said, I could honestly not find anything I didn’t like about the A73.

    Well done, Fidue!
      DJScope and triplew like this.
    1. View previous replies...
    2. HiFiChris

      When I read some other reviews, I also noticed that they somehow differed in terms of perception of the A73's sounding, but I've just written down what I heard, with the IEMs in my ear canals. Being connected to sources with a low output impedance, I did multiple sine sweeps and compared them to my UERM and ER-4S (as the latter has the flatter highs, except for the emphasis in the lower highs/presence area), and that's just how they sound in my ears.
      It doesn't happen very often, but sometimes my perception of an IEM deviates from other enthusiasts. In this case, what I have written about the highs is plainly what I perceived in this case. As you will most likely know yourself, the angle and insertion depth sometimes have got a huge influence, and my tests with the Carbo Tenore earlier that year in a German community were a good example for it (regular depth: v-shaped, very deep insertion: warm sound with recessed highs). I'd consider myself experienced enough to know what I write about my own perception, as I have been one of the top-tear reviewers and purchase advisor in a large German headphone/audio community, receiving only positive feedback.

      As there no issues detected by me in my ear canals, I genuinely gave the A73 5 stars.

      I hope to jump into making IEM measurements myself in the near future when the VibroLabs Veritas arrives, maybe you have also heard of it. Imho a very interesting approach.
      HiFiChris, Sep 19, 2015
    3. Brooko
      Yep it's what I'm using now Chris (the Veritas).  Combined with the ARTA software, it is brilliant for the hobbyist objectivist :)
      And I seem to be the minority in my impressions of the A73 - but again my thoughts on the 5 star relate to things like the ringing in upper-mids / lower treble, peak at 9 kHz (sibilance), and the fact that there is no lip on the nozzle (almost no-one seems to have pointed that little gem out yet).
      Brooko, Sep 19, 2015
    4. HiFiChris

      Ah, that's neat. :) Do you know if adding an HRTF compensation to the graphs is possible with the Veritas and ARTA?

      Well, I find the "peak" (which is, in my ears, by the way at pretty much exactly 8 kHz) to be of lesser amount than on the Triple.Fi 10 or Fischer Amps FA-4E XB or UERM. But then again, perception often differs and I've eve come across people that heard sibilance on the Westone 4R, InEar StageDiver SD-2 (okay, there is some sort of peak in the upper highs, but it is still below ground line) or Knowledge Zenith ATE.

      Indeed, there is no lip on the nozzle, but I honestly don't even consider it as a flaw and haven't even noticed it (and actually don't care as long as the tips stay on without moving or getting lost in the ear canals).
      Looking forward to reading your review though.
      HiFiChris, Sep 19, 2015
  9. vaibhavp
    Hybrid design benefits.
    Written by vaibhavp
    Published Jul 1, 2015
    Pros - Intimate lifelike vocals and soundstage, lively and dynamic, grainfree sound
    Cons - soundstage lacks a little depth
    Disclaimer: I would like to thank www.hifinage.com and Fidue for this review sample.I was supposed to keep it for 1 week for evaluation purpose free of charge. I am in no way affiliated to Fidue or www.hifinage.com. I will be writing this review in unbiased way as possible.
    To save reader's valuable time, I have structured review a little differently than usual.
    So lets see how it sounds:
    General: This is first time I am listening to a hybrid design. It comprises of balanced armature and 10 mm woofer dynamic driver. When I had a first listen I was surprised at how crystal clear, completely grain free the sound was. Later when I tried my other dynamic driver earphones, they all had a little grain in their sound. Another aspect I found different from dynamic driver was clean transient response. While listening to Rhythmscape from Bickram Ghosh, its a well recorded disc that has multiple precussion instruments like tabla, drum etc playing against completely black background. Changeover from one instrument to another was very clean on Fidue. I compared it with my dynamic driver earphones/headphones, even my AKG k550 which are technically capable headphones, had some noise. Also the background is completely black on A73.
    Bass: Bass is round, dynamic, goes deep, is well textured. It certainly makes its presence felt and is not a bass light iem, from headfi standards. Its punchy and satisfying.
    Mids: Mids are crystal clear as are grain free, a bit smooth than detailed, slightly warm and lush.
    Treble: Treble is lively, not overly rolled off but is not harsh at all. 
    Dynamics: Exceptional for this price range. I found sound to be very lively and dynamic.
    Soundstage: Soundstage is intimate, especially vocals are front and center and rather intimate. Other instruments are laid around vocals and are also intimate. One criticism I have is soundstage does not has lot of depth and layering is not as refined as some of my other headphones. 
    Outside of that, if you like me enjoy a rather intimate soundstage than an overly airy one, where you have to squint your eyes to hear any detail, this iem is for you.
    Instrument separation: Despite of intimate soundstage, instruments are very well defined and separated. I think intimate soundstage with great separation are one of its biggest strength.
    Overall tonality: A very even handed frequency response. Note edges are rounded, which gives them a little warm, lush presentation. Its lively and dynamic, thus not a very laid back sound. Detail presentation is relaxed, its their to hear but is not shoved in you face. 
    Comparison with Hifiman RE400:
    A73 a step up over RE400. It goes deeper in recordings and brings listener a little more closer to music. Outside of that it boosts a similar neutral frequency response as Re400. It does fixes a couple of shortcomings in RE400, A73's bass goes deeper, is more textured. Also sound is more dynamic.
    Where RE400 beats it is soundstage depth, it has very refined layering in its price class. RE400 has sharper note edges and is on colder side of neutral. While A73 is on warmer side and rounded edges.
    A Note on similarity with Sennheiser HD700: When I heard A73 for first time, it instantly reminded me of HD700. I know its unfair to compare two as HD700 was introduced at $1000, but they have some key similarities as far as tonality is concerned. Them being crystal clear grain free sound, even handed frequency response, slightly warm tilt, relaxed detail presentation. Technically A73 can't compete with HD700 but tonally I find similarities. 
    Now that the sound part is over I will present some mundane information:
    Fit: Included are 4 tips, S, M, L and double flange. Initially I thought it will be hard to achieve seal with just 4 tips, but surprisingly all 4 offered varying degree of seal. None of them was perfect seal but double flange tips gave me best seal and almost full sound potential. 
    Isolation: Once music started playing, I had no problem in listening at normal, "at-home" level volumes on my cell phone in metro. So isolation is acceptable.
    Build quality: Housing seems to be made of 2 parts, one plastic, one metal that is shaped beautifully. Cable seems to be robust, but is not very flexible. Also its non removable and strain relief, though good, not the best I have seen. If you take good care of them, I am sure they will last you a long time. 
    Accessories: It includes 4 tips, shirt clip and a hard zippered carry case. It is also equipped with single button remote that worked perfectly well with my Sony Xperia smartphone. It could be used for play/pause and also taking calls.
    Amping: I used Audinst HUD Mini for most of my listening. I also used Sony Xperia SP smartphone. Audinst is mostly neutral sounding dac/amp and has low output impedance so it had no problems in driving them. 
    Since its a hybrid design with 20 ohm impedance, I recommend using sources with less than 1 ohm output impedance for optimum results.
    Value and conclusion:
    At $150 I thing its well priced. I think as a overall package it offers great value. Though IEM world sees cut throat competition, it does enough to differentiate itself from other dynamic driver offerings and is well worth your consideration.

      DJScope and infer like this.
    1. View previous replies...
    2. vaibhavp
      OK. thanks.
      vaibhavp, Jul 2, 2015
    3. arijitroy02
      Cool review, bought these from hifinage and got them this Monday! Very happy so far, doing a burn-in for now!
      arijitroy02, Jul 2, 2015
    4. vaibhavp
      awesome. they are a great buy. do share your impressions.
      vaibhavp, Jul 2, 2015
  10. DynamikeB
    Great hybrid earphone, the best I tried so far, awesome detail retrieval!
    Written by DynamikeB
    Published Dec 4, 2016
    Pros - Lightweight and solid construction, awesome detail retrieval + fun sound, balance and imaging
    Cons - Some may find treble aggressive, tip dependent
    Fidue have been active for some years now and they seem to have release great quality products / earphones.  Personally, I have tested two of their models:  the A71 and the A73.  I will review the latter here.  The Fidue A73 is a solid offering in the 120.00-150.00 price range and the “Reference Level” classification by Fidue is right on.
    About me:
    I am an avid fan of music (many style, but a lot of rock) and headphones/earphones.  I am not an audiophile, but I have a quest to find the best headphone/earphone for my tastes and I like to test new gear a lot.  I owned / tried more than 120 headphones / earphones so my ears are pretty trained, even though I am not a graph fan or as qualified as other more technical listeners.  I rely on my ears, my gut and my pleasure to move forward.  I just hope to help other people find nice gems that will suit their taste and their budget.  Enjoy!
    I read really good reviews on the A73, so I decided to give it a go when I saw a nice deal.  I had high expectations for this hybrid / dual driver earphone, and I was / am not disappointed.  Up to now, after about 60-70 hours of burn in, listening and some tip rolling, I can say that these are a keeper, and probably my favorite so far.  And I tried a lot, and got rid of most of them…  It’s a solid iem that delivers a lot for the price.
    ·         Drivers : Armature & 10 mm Dynamic
    ·         Rated Impedance : 20 Ω
    ·         Frequency Range : 13 Hz ~ 27,000 kHz
    ·         Sensitivity : 107 dB
    ·         Rated Input Power : 20 mW
    ·         Plug : 3.5 mm, Gold-Plated
    ·         Cable : 1.3 m Silver-plated OFC cable
    ·         Built-in universal mic and remote
    ·         Fidue hard shell carrying case
    ·         3 sets of Silicone Ear Tips (S M L)
    ·         1 set of Silicone Ear Tips – double flange
    ·         1 Shirt Clip
    ·         1 ear hook
    The A73 comes in the hard and classy Fidue black box where you can see the green Fidue logo and the picture of the earphone itself.  Box is nice Premium quality and all is well packed and clean.  Fits with the price range and more.  Basic accessories, but efficient and pro presentation.
    1. Housings:  The housings are fairly small and comfortable (smaller and more comfy than Shure SE215 and Westone 1 and W40, for example) and are made from the fusion of silver aluminium (on the outside) and hard transparent deep red (on the inside).  A really nice touch, stylish and classy looking.  They are solid, sturdy.
    2. Cable:  The cable has standard good thickness, with good strain-reliefs.  It does not tangle easily (or at all) and provides basically no microphonics since the A73 is meant to be worn over the ear.  Great quality as it is a 108 Core hi-end silver-plated OFC cable.
    The A73 is equipped with a microphone and remote that provides clear phone calls option with most devices, and audio player + volume control.
    Ergonomics / Fit / Microphonics / Isolation
    The housings are on the small size and lightweight, so easy to insert and really comfortable.   They are meant to be worn over the ear, which I prefer.    Isolation is ok, depends on the tips I use, but they are not really for deep insertion, so isolation is not their strongest point, but I don’t need them to be.  Still, my work is noisy (open space and a lot of people) and I don’t really hear anything when they are plugged in.
    Sound Review
    I tested the Fidue A73 with my iPod Classic 160gb unamped, and then amped with the Fiio A3.   Also, I tested it on my Asus laptop amplified with the Nuforce U-DAC 3.
    I usually test the earphones activating the shuffle on my iPod so I hear a variety of music that can go from Diana Krall to Rage Against the Machine, as well as from Depeche Mode to In Flames.
    The A73 are pretty easy to drive out of any device, but like/prefer the little upgrade in sound provided by the Fiio A3 (and with the bass boost activated).
    The A73 sound lively with a very nice detailed sound that benefit from the dual drivers.  The dynamic driver presents a nice wide but balanced bass and the balanced armature driver gives the presentation a cutting egde precise blend of highs and mids.  I would say it’s slightly U-shaped, but not by much, and the detail retrieval is awesome.  One of the best I have heard so far. 
    They required some serious tip rolling for me to find the right sound.  I ended up using the medium stock silicon Brainwavz tips.  JVC Medium Spiral Dots were ok, but it seems the highs were more piercing and I was having a hard time listening to them in the morning (when my ears are not awaken yet) or at night (when tired).  With the Brainwavz tips, it cuts just slightly the highs and bump the lows a bit, keeping the midrange intact and it hits the sweet spot for me.
    Stereo imaging is really good, and instrument separation is awesome.  Soundstage is really nice.  I would say wide, but not that deep.
    Lows / Mids / Treble
    Bass hits pretty deep but it’s not invasive.  I find it to be nicely balanced between the sub and mid bass.  Unamped, it’s pretty good, but most of the times, I discovered I like to switch on the bass boost on the Fiio A3 to give it some additional body.  As mentioned, bass is not invasive on other frequencies, but it gives a nice warmth to the ensemble that I miss on some higher end iems (like the Westone W40).  It’s precise and fast enough.
    Midrange is detailed and clear, just a tad below bass and treble.  The amount of detail is impressive and vocals sound clear, clearer than most iems I tried up to now.  Clarity is present on all types of recordings and styles.
    The treble extension is impressive and helps provide an awesome precision.  Impressive, but for people sensitive to surgical precision treble, you may want to tame these with tip rolling or EQ.    It could be fatiguing, but once I found my sweet spot with the right eartips and set up, the A73 are my top go to iems for critical and fun listening.
    Fidue A73 vs Fidue A71
    The A71 is the « little brother » of the A73, in terms of price range.  Except for the brand, I don’t find much similarities between both.  The A71 is more impactful, with mid bass and mids up front, and a more recessed, but still detailed treble.  They have a nice construction, but A73 is better, more comfortable.  Both are meant to be worn over the ear, but A73 wins on all fronts:  Comfort, ease of use, sound quality, etc.  A71 was a nice try, but I never was able to appreciate any of it, even though I would understand why people would really like it.  Not my type of impactful sound.  I prefer the more balance + detail + fun (with great bass) sound of the A73.
    Fidue A73 vs LZ A2S
    Working both with dual drivers, one dynamic and one balanced armature, these delivers a good fight in their respective price range, but A73 shows why Fidue is getting known as a strong and steady quality brand, and why it costs a few bucks (or sometimes twice the price) more to get an efficient high quality product.  I like the A2S sound, it has a nice warmth to hit, a bit hollow though, but the detailing and precision of the A73 is just way up there.
    Fidue A73 vs RHA MA750
    Comparison between these two great iems, in the same price range, is interesting.  I really like the RHA MA750:  Tough build, easy to use and wear over the ear, great warm sound.  They have similarities, but there was something a bit off with the MA750.  Mid-high frequencies?  They are both great iems in the 120-150 price range, but I find the A73 more precise, subtle, and providing better and more even level of precision.  Probably the dual drivers that gives the A73 the edge to be superior.
    Through all the earphones I tried and used, the Fidue A73 keep coming on top of my list.  I appreciate a lot of earphones, like a lot, but love only a few and the A73 is one of them.  Great job from the Fidue team for such a great quality product overall.
    In the price range, IMHO, I think they deliver as promised.   They offer great (awesome!) value and quality.
    They are comfy enough to relax and even sleep with them, but I also use them to walk, run or train without problem.  Great versatile earphones.
    1. View previous replies...
    2. DynamikeB
      I agree.  Bass is great.  Right in its place.  And yes, all this is IMHO as usual, but what a great one that fits most, if not all musical style I throw at it!
      DynamikeB, Dec 8, 2016
    3. alexandros a
      Forgot to tell you man...
      Spinfits are the best tips i ve tried so far with A73 SpinFit CP800-L
      If you have a chance to try those you will be amazed...Due to dipper insertion those provide a big difference to high and low frequencies enhancement
      alexandros a, Dec 9, 2016
    4. DynamikeB
      Thanks alexandros a.  I will look into these tips as well.  I am always on the look out to get the best out of my listening experience.  Regards!
      DynamikeB, Dec 9, 2016