Fidue A73
Headfonics 2015

Fidue A73 Review

Today’s review is about the new Fidue A73 which is the company’s latest hybrid multi-driver IEM and the successor to their original and highly regarded A83.

Disclaimer: The Fidue A73 sent to us is a sample in exchange for our honest opinion. We thank the team at Fidue for giving us this opportunity.

To read more about Fidue products we have previously featured on Headfonics click here

Note, that this feature follows our latest scoring guidelines which you can read up on here.

Fidue A73
Fidue A73 Review
Despite the slightly elevated bass response in the A73 I still say Fidue are a bunch of audiophiles who die-hard for treble sounds and a store a bunch of Chesky records in the background somewhere. The A73 is an attempt for me to largely replicate that passion on a budget and they almost pull it off if it were not for that slightly hot treble response.
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Fidue has started to get rather prolific in the IEM market over the last year or two and from the A83 downwards I have seen at least 4 to 5 new models come out all with specific target markets in mind from treble heads to bass heads to something in between.

Their unique designs inspired by Benny Tan their head designer are certainly eye-catching and you can never describe Fidue as lacking in flair. Good or bad they are certainly always memorable.

The A73 can be best described as a listening process between Fidue and the audiophile market on the pros and cons of the flagship A83 which we reviewed about a year ago here.

The A83 for me was an excellent treble head hybrid universal IEM with a tight bass response and decent mids but had some fitting issues and at times I found it a little difficult to get the right synergy between source gear and earphone.

It had a lot of potential for sure but perhaps, given the SRP at $300, might have felt the heat from other IEMs that might be considered more matured at that price range such as the Westone 4, UE900, and Sennheiser’s own IE range.

Tech Inside

The A73 for Fidue then is a response to those criticisms of the A83 without breaking the bank. First of all, it starts at $149 in most outlets, that less than half of the A83 price.

Second, they have captured the spirit of the A832 nicely in design and form factor but shrunk it considerably to size most will find to fit better in their ear than before. There have been some sacrifices though to get that price.

The hybrid design loses one BA at the top end, as a result, making this a dual hybrid rather than a triple with one dynamic 10mm driver and a single BA handling the mids and top end. Gone is the detachable cable also and the accessories packaging has been reduced a little compared to the A83.

What You Get

The Fidue A73 comes in the standard Fidue green and black packaging endorsed by Benny Tan, the founder of Fidue and a well know Chinese headphone designer who also worked on the A83. Inside the A72 is carefully wound around a single layer of foam cut out to present a stylish but tastefully spartan layout alongside a branded black pill case.

Fidue A73

Everything else is tucked away inside the stiffened carry case and these also include three sets of single bore grey silicone tips in small, medium, and large as well as a pair of double flange tips (my personal favorites) and a lapel clip.

The earphones themselves are wrapped with an adjustable rubber strap which I actually appreciate given the majority just come with the usual plastic coated wire holders.

Fidue A73

Overall it’s a simple package in many respects, slimmed down from the A83 though do note it is much cheaper than the A83. If anything a set of foam tips might have been useful just to add a bit more flavor but I usually end up with flange tips as my preferred referencing tips or the medium single bore if the flange silicones do not fit.


The A73 really does look like the junior sibling of the A83 in many respects. The grey-toned front plates have that same crested wave pattern as the A83 with an opaque plastic ear shell.

This time though both shells on the A73 are similar in color with a rich wine tone rather than the old school red and blue of the A83. It is certainly a lot subtler and I actually prefer it to the brasher red and blue of the A83.

The construction is blemish-free and reasonably solid, certainly not the lightest IEM I have held but a little heft for me is preferable to something too plasticky and light.


The strain reliefs on both ends of the cable are sold enough and are colored in the same wine tones of the ear shell itself making the whole piece that bit more style conscious. The A73 is fitted with a 1.3m grey-colored tubular silver-plated oxygen-free copper cable terminated with a gold-plated Fidue branded straight 3.5mm jack.

It’s not as high-end as the silver-plated OFC memory retention-free MMCX cables of the A83. The cable itself has a little bit of memory retention and only a mild amount of microphonics. It does get a bit springy though it rarely knots up during usage.

The cable and build of the A73 are that of an over-the-ear IEM. The contoured shape of the A72 will not allow straight down usage unlike their A65 but the interesting thing for me is the lack of ear guides to reduce the level of microphonics and keep them securely in place during usage.

This would have been a welcome edition. It’s not as if the cable won’t stay behind my ear at all, it actually does that reasonably well but it’s not like the Westone EPIC cable which just wraps around your ear so naturally. There is a touch of spring in this cable that does mean you are fitting and bending a little more than is comfortable.

The A73 also comes equipped with a single button remote and microphone on the right side of the y-split and functions perfectly fine with both Android, BB, and iOS for calls and playback control.

Fit & Isolation

The nozzles on the A73 are of average depth but certainly longer than the A83. They are also positioned at a slightly more slanted angle than the A83 making insertion and fiddling for the sweet spot a touch easier than what I got with the A83.

Overall the A73 fit was good for me with single bore mediums though isolation was just above average with similarly priced units from RHA providing a better seal such as the T10i and T20.

I just felt the design could have been done with a longer nozzle and a deeper insertion for superior background noise blockage. Sadly, the supplied dual flange tips were simply too small for my ear canals, and isolation is therefore non-existent which is a shame as I do love well-fitted flange tips but these suit much smaller ear canals than mine.

Sound Impressions


Tonally speaking I found the A73 to be a bit warmer than the brighter treble orientated A83 with a nice clean response, a naturally weighted bass body, and pace characteristic of a dynamic driver.

If anything the A73 takes some of the treble performance aspects of the A83 and adds a warmer more natural bottom end with the 10mm dynamic driver and a slightly elevated vocal presence to produce an IEM that I think veers more to the musical side of presentations.

I did however find the A73 to be a little peaky in and around the 7k range which is a hot spot for splashy percussion and sibilance if not matched well. Overall a slight u-shaped FR with some elevation in the mid bass, vocals, and a peak on the 7k.

It never really comes across as a typical consumer sound though despite the elevated bass response. The slightly thinner edge to the A73’s overall tonality marks this IEM out as being better tuned for the typical jazz-infested mid-tier DAP you see hanging out of everyone’s pocket at a CanJam near you.

It is not in any way veiled, bloated, or overly syrupy, quite clear and articulate actually especially with lazier but intricate genres like lounge/jazz vocal tracks or acoustics. If you are stacked with a bunch of binaural recordings or Chesky-laden albums the A73 fits right in style-wise.


The A72 has an elevated bass response from 50-200hz that is reasonably planted with decent sub-bass extension and only a slight roll off when you get down real deep below 50hz. It’s actually a well-controlled bass signature, possessing a good body and a hint of warmth, but never bloated or overly soft.

The characteristics of the dynamic driver mean it’s not the fastest but it does sound relatively more natural sounding with good impact, texture and detail. Much more so than all BA’s setups for bass delivery in this price range.


Mids are pulled back just a tiny amount in the lower midrange with a better level of elevation and energy in the upper midrange and vocal presence.

The A73 thankfully does not suffer from any bass bleed into the lower midrange so the slight dip is not terribly noticeable and as such, I never got the feeling it was a recessed response. This is where the BA design starts to kick in so details and speed are actually very well defined and snappy with good micro detail.

Vocals are excellent and full-bodied when everything else is toned down/ Jazz and acoustics where single female and male vocals take center stage are clear and well defined however things got a bit ragged once you threw in full-on rock harmonics and aggressive guitar and percussion.

The timbre of the A73 is far more suited to sparse musical arrangements where the subtleties are far more nuanced than full frontal sonic assaults.


A73’s treble is a little uneven for me with a prominent 7k spike that adds a little too much heat to an otherwise clean and well-extended top-end performance.

Unlike the peaking in the A83 which crept in a bit higher around the 10k mark, the A73 hits right in the sibilance zone leaving percussion a bit sharper and harsher than I would like it to be and synth work a bit on the piercing side.

Comply tips or foam tips can help tame it a bit, a warm thick source can also help also but otherwise, it comes across as a little too peaky to be as likable as the A83 treble response.

If you are working out to a lot of classic 80’s glam metal or synth induced rock with a ton of percussion and shredding solos this might grate and become fatiguing.

Slow it down however to a more gentile pace and thankfully it becomes more tolerable and that’s when the detail shines a bit better because otherwise, the treble on the A73 is quite articulate. Interestingly EDM did quite well also with the likes of DeadMau5’s While album taking advantage of the u-shape of the A73 quite nicely and avoiding a lot of the sibilance I found on 80’s rock.


The A73 has a medium-range sensitivity setting at 107db SNR and 20-ohm impedance but it is still pretty easy to drive out of most decent setups and as such I am inclined to avoid additional amping unless you are trying to tweak the synergy a little to your preference.

The word synergy is actually quite critical for me when IEMs come into play, especially with an IEM that peaks up a little at the top end as that’s my most sensitive listening area. DAP testing though did yield some interesting results.

BB Passport

The smartphone exercise and yes slightly lower dynamics, slightly softer bass response, and vocals pushed back a bit further. However, it did a good job with the peaky treble without sounding too harsh or sibilant even with huge pitfall traps such as Whitesnake’s Still of the Night which I was expecting to be a total car crash.

It’s not a terribly strong amp but it’s one of the better mobile phone amps out there and plays Flac natively. I could live with this match on the go maybe but I might want something more.

FiiO M3

The Clip killer and a DAP we will review very shortly indeed. This is a lovely little match with the A73 with only a slight drop in dynamics and resolution compared to the heavier hitters.

Volume is very manageable 20-22 for most tracks and no noticeable noise or hiss. The M3, and mind you its early days with it, seems to have a neutral to slightly warm tilt to its response with a rolled-off top end and a smooth midrange.

The Bass is slightly elevated also and reasonably full sounding. It does a really nice job of pulling back the treble peak of the A73 and it could be the most pleasurable listen thus far though not the most resolving of all the DAPs I tried. You have to remember the M3 is just $55 and if you are in the market for an A73 and a DAP this makes a really nice combo.

Fidue A73

iBasso DX80

This is a much superior match with a lovely smooth warm signature and just worked a treat with EDM and Deadmau5’s The Veldt which can easily descend into sibilant chaos if matched poorly.

No noticeable noise or background hiss either an excellent left right channel balance and volume sitting comfortably at 70-75 low gain. Even super-hot synthy and percussion rock tracks such as Brother Firetribe’s For Better or Worse was kept well under control though still sounded a bit too metallic overall to convince as a rocking IEM.

This match sounded more realistic and at home with the likes of CC Colletti’s blues swing and sparse acoustics mix on Bring it on Home or Caro Emerald’s perky jazz vocals on her Parisian swing influenced Tangled Up.

Fidue A73

AK120/CEntrance A1 combo

Perhaps a bit too much power with the mechanical volume on the Glove down by 5-6 notches. A much cleaner signature and perhaps too much energy brought out a really aggressive dynamic and much more menacing bass response on a track like “Rocky Mountain Way” from Ozzy but in return, I got a little too much heat from the lower treble that I didn’t get on the DX80.

This match is excellent though for detail and articulation at all gain levels and really makes the A73 come alive. Paquito D’Rivera’s The Peanut Vendor really spritely but delicate Cuban overtones and the clarinet-driven orchestra are superb. The treble articulation is excellent and the a73’s slightly thinner tonality works a treat with the vast array of percussion and wind instruments at play.

FiiO X7

The imaging and clarity of the X7 with the A73 is superb actually and whilst the treble once again gets a touch sibilant given the FiiO X7 is far more neutral I still find this combination very convincing.

Vocals in particular are expressive and the bass picks up a touch more speed certainly than the DX80. Bass’s response to using EDM on the X7/A73 is huge also.

Clearly, the A73 is capable of being pushed very hard indeed. Volume sits at a steady 60 on high gain and around 68 on low gain for DSD64 Queen A kind of Magic that is more than comfortable listening levels with zero noise or background hiss.

Brief Comparisons

The A73 is right in the firing range of the RHA range and it’s a hit or miss if I would choose one of them or the A73. Ultimately it would depend on my mood and what genre I want to play for the day.

The T10 and T20 mold injected metal shells are by far the comfier of the two. The A73 though is slightly better fitting than the M750 from RHA which has the more classic straight chamber design making fit more of a hit-and-miss compared to their new designs.

Though slightly heavier in weight the RHA T20 and T10i feel a lot more durable than the A73. Not that the A73 is fragile by any means but that metal is rock solid on the RHA units.

Tonally the T10 is much more limited in use than either the T20 or the A73 with its much heavier hitting bottom end and shelved down top response making it an EDM king but not much else beyond that even with the treble filter. However, even though the A73 has the chops for trance I would still grab the T10 for slower BPM and harder hitting dub, house, or techno.

The T20 is much more realistic as an all-rounder than the T10 but coupled with say the FiiO M3 I actually felt the A73 was the slightly more spacious performer than the T20 with better top-end extension, a slightly bigger soundstage, and greater clarity in general. I loved the T20 with the treble filter but the A73 with a good matching budget DAP actually outperformed it.

Other hybrid IEMs such as the Sony XBA-H3 have a more refined and balanced FR right the way throughout with better balance in its treble response but at twice the price.

They also require a lot more power to perform adequately (iBasso DX80 hit 90 on low gain!) and have a weird seal angle that is infuriating at times. Get them right though with some foams or a good-sized silicone single bore and they do pull away a bit from the A73.

Our Verdict

Despite the slightly elevated bass response in the A73 I still say Fidue are a bunch of audiophiles who die-hard for treble sounds and a store a bunch of Chesky records in the background somewhere. The A73 is an attempt for me to largely replicate that passion on a budget and they almost pull it off if it were not for that slightly hot treble response.

The good news is there are a ton of DAPs out there that actually respond quite well to the A73 and if you have $55 to spare the M3 from FiiO might be the best choice of the lot.

I admire the way they took the A83 feedback and came out with something they felt could do it justice but for less than half the price also. There have been some cutbacks on both accessory type and levels that I think a few foams would have been worthwhile including and the cable is a bit bouncy also.

I get that, you can’t have everything at $150 but then again RHA is churning out a lot more at $150 also these days so it is possible to be competitive on a shoestring budget.

The good news is for me the A73 actually sounded better than the T10i and T20, especially with the all-new FiiO M3 and that is saying something because I do really enjoy RHA’s offerings.

It didn’t have the ability to knock something like the Sony XBA-H3 off its perch for hybrid resolution but overall I would say you get your money’s worth with the A73. Just don’t forget to have a few spare foam tips at hand.

Fidue A73 Technical Specifications

  • Driver: Φ10mm Exclusive Dynamic & Balanced Armature Drivers Frequency
  • Frequency Range: 13-27,000 Hz
  • Sensitivity: 107dB
  • Max Input Power: 20mW
  • Distortion: <1%
  • Plug: 3.5mm stereo, gold-plated (MP3, iPod, iPhone & iPad Supported)
  • Cable: 1.3 m
  • Sensitivity of Mic: -42+-3db
  • S/N Ratio of Mic: >55dB

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