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

    Dismiss Notice

HiFiMAN RE-400

  1. drambit
    Mediocre IEMs for a mediocre price
    Written by drambit
    Published May 15, 2015
    Pros - Excellent mids, decent price
    Cons - bad sibilance, comically weak bass, unattractive, poor build quality, not very comfortable, microphonics
    I bought these in early May based on nearly unanimous recommendation from people on a bunch of websites, and I must say they don't live up to their reputation. Some of the common things people pointed out were that they are excellent for the price, they have great mids, and they have bad build quality, the bass could be better, and that they are great for all genres. Most of these points definitely stand up, I don't think I have ever heard better mids in my life, they are fairly cheap, but to me they have nothing else going for them. The bass isn't just leaving more to desired, it is so bad it makes some genres hard to listen to, it is almost comically weak, more like a tickle than a punch. They aren't especially neutral, they are just very mid heavy. I guess it sounds neutral at first glance, but the lows are extremely recessed, and the highs aren't very sparkly, they also have bad sibilance in a lot of cases. It is basically the opposite of the classic "V-shaped" sound signature, whereas normally mids are recessed and there is too much emphasis on lows and high, these have way too much emphasis on mids and bad lows and highs. They also definitely don't work for all genres. When listening to classical instrument seperation suffers, soundstage seriously suffers, bass suffers, highs suffer, and volume suffer. For metal the vocals are amazing but a lot of the rythm is lost in the weak bass, funk is amazingly smooth and probably the best genre for these, for techno in general they are terrible due to the bass problems, although as usual vocals stand out and are excellent. 
    In terms of physical qualities they aren't great either. They look quite cheap, which is the downside of their otherwise nice minimalistic style, the 3.5mm jack is very obviously low quality, as someone who fixes headphones on a regular basis that stand out like a sore thumb, the cord definitely also feels a bit flimsy and I don't expect it to last long. If you don't wrap your earphones around the back of your ear these suffer from constant annoying microphonics leaving you with no obvious choice except to wrap the, but they also have a tendency for the wire to constantly fall off my ears, which can get very frustrating at times. The sound isolation is mediocre, nothing really to complain about but also not worthy of praise, I often have to bring the volume up a lot compared to where I normally do with IEMs. The choice of included tips is strange to me, there is a bunch of flanged ones that scratch and irritate the inside of my ears, there is ones that are way too small, ones that are way too large, and only one set that is similar to what is normally included with all IEMs which is medium sized rubber tips, but it's still not exactly the same it's like a half flange, the tip is two different sizes but it isn't separated, 
    In conclusion, I definitely do not recommend these earphones. I have had 40 dollar Sony earphones perform twice as well as these for less than half the price, and they lasted me almost 2 years, where these apparently have a tendency to fail after only a few months. These are an exceptionally mediocre pair of earphones with a huge list of major downsides that are only redeemed at all by the excellent mid range performance.
    1. View previous replies...
    2. krelianx
      Must say I agree. Anyone who says these are anything but very bass-shy they are deluding themselves, or others. The treble is also quite mellow, and not very well extended. The mids are great, but overall the sound profile is congested, dull, with a cavernous soundstage. The build is pretty bad as well. These are the most overrated earphones I have heard.
      krelianx, Oct 26, 2015
    3. harry501
      I agree with you, I marvelled at the detail i was hearing but in time it started hurting my ears how clinical these sound... very cold. The bass is heard but very very low. i also wear AKG K451s which are bass heavy and very warm, which i like but i was fed up wearing them in hot weather. Sadly when i go back to them it makes the 400s sound so much weaker and boring sounding. Cable noise is horrendous. I too got suckered in with the insanely high reviews
      harry501, Feb 7, 2016
    4. flognarde
      Sibilance on these ? You must be joking or having recieved a broken pair ! These highs are one of the smoothest ever heard on IEM's . Unatractive ? Are you talking about my mother ?... let's say discrete and let them desappear... Give them a decent source on a decent amp/dac and you might change your mind?
      flognarde, Jul 13, 2016
      G_T_J likes this.
  2. Apex Eight
    HiFiMAN RE-400 Review
    Written by Apex Eight
    Published Jan 24, 2015
    4/12/15 - I've deleted my entire review and will be completely revising/rewriting it. 

      Twain250 likes this.
    1. View previous replies...
    2. canetsbe
      Nice review and mirrors my impressions spot-on.  These were my first good IEMs and I love them to death.  Wonderful balance and transparency.  Well done!  I hope more people are turned onto these gems after reading your review.  They won't be disappointed.
      canetsbe, Jan 27, 2015
    3. tfnvk
      hi all! how is this compared to gr07's mids and treble?
      tfnvk, Feb 3, 2015
    4. NeonHD
      Four years later and still hasn't finished the review yet, lol.
      NeonHD, Apr 30, 2019
  3. krelianx
    Ruined by lack of bass response
    Written by krelianx
    Published Nov 9, 2015
    Pros - Beautiful midrange, tonality, no sibilance, smooth, mellow treble
    Cons - Severely lacking in bass response, build quality, narrow soundstage, lack clarity
    Unfortunately, I find these to be the most overrated iems going on the market at present. Anybody who claims that these have sufficient bass response are just deluding themselves, or others. They are extremely bass shy, to the point where it just ruins the music. I also own the Trinity Deltas, Vsonics vsd3s, and senns cx-300ii; and the Hd-600s and Fidelio x1 for full sized cans. Even next to the hd-600 which is hardly 'bassy' is not lacking in this department, while the re-400s are just deflated there. Such a shame.

    The midrange is lush and smooth, and the treble is just right. The soundstage is very narrow, however, and the presentation lacks clarity and transparency. Also, the build quality is truly terrible: the wire  from the Y split to the driver casing is very thin and the actual connection to the case is weak (it separated barely 6 months into usage). The tip assortment is fine, with the Comply Foam tips giving it a bit of extra bass hump it sorely needs. However, they make the presentation even narrower and more congested than it already is. Sillicon tips uniformly give the same bassless response.

    These are horrendously overrated.
      DAVID_54 likes this.
    1. Deviltooth
      I loved the sound, bought two pairs and both died the same way.  One side failed.  Considering how many earphones I've bought (both less and more expensive than the RE-400s) that have had no problems I've resolved to avoid HiFiMan from now on.  They're great at tuning but their build quality and quality control is sub-par.
      Deviltooth, Nov 9, 2015
    2. Redcarmoose
      I think these builds may start to be a thing of the past? How HiFiMan can get away with this level of build quality is beyond me. This style of quality could be tolerated 5 years ago. Now you have $16 Piston 3 headphones which are built 10x better. It's not just that the HiFiMans always failed right at the mini-plug, but if not there, a driver would always fail on one side in time. These issues are not a question of if, but when. It's a quality that should put a product on a flag list of some type. Audio-fools, I mean audiophiles are a strangely forgiving group at times like this.
      Redcarmoose, Nov 10, 2015
    3. krelianx
      These made me single-handedly doubt the entire audiophile verdict. These are simply mediocre, the build is indeed atrocious. And though the tonality is quite natural, you simply can't justify the lack of bass without ignoring the visceral quality of the music. 
      krelianx, Nov 14, 2015
  4. mlthelasher
    Good to have, but felt held back
    Written by mlthelasher
    Published Nov 19, 2014
    Pros - Neutral, good to have, 45 degree plug
    Cons - Neutral, could use a bit more bass, Microphonics
    Build / Fit
    They are much smaller than I expected. The aluminum casing is nothing too special, it looks very clean, and simple. The wires above the split are very thin with a feel like they could break easily if you use then regularly on the go. But, below the split is a very nice cloth cable that leads into a 45 degree plug. The fit seemed very loose, even with the comply tips.
    Neutral with a very slight rise in a bass. For the price, even for the $99 MSRP, they are incredible. The detail and sound stage are as good or better than some full sized headphones I've listen to. IMO the bass could use just a bit more impact?, not too much though. The Highs were just great, non-fatiguing, but still held the detail very well. The mids are neutral, nothing sounded too out of place. Again, for the price you can not get better than this. There is a reason why HiFiMan calls them the waterline.
    I guess this is something take into consideration? I thought is was very simple, clean, like the headphones that lay inside. There is a thick plastic sleeve that I thought was neat.
    They are fantastic pair of IEMs to keep in your collection, I will be using them when I am too lazy to put on my SE-215s or is a rush. BTW, Microphonics are a thing. I love the RE-400s, but they feel like something was holding them back from being spectacular.

      snrf likes this.
    1. Tom22
      in regards to the microphonics i agree entirely, thats why i use these exclusively over the ear (wrapped over my ear).
      its quite bothersome. the build is another issue (its quite underbuilt for its price tag)
      but the sound is just in another league. its simply clean, transparent without sounding cold or analytical. it walks a very fine line and does it effortlessly.
      Tom22, Nov 19, 2014
  5. TKWizard
    Great IEMS, however..
    Written by TKWizard
    Published May 17, 2013
    Pros - Great Sound, Very good design, very comfortable
    Cons - Slight durability issues, as Left side of the IEM is already cutting out
    I ordered these when my Astrotec AM-90s finally bit the bullet. Liking them so far, however the Left side is cutting out possibly due to a short on the plug.
    Messaged HiFiMan and hope I get a replacement. I would had given a 5/5, but I'm knocking off 1 1/2 stars due to the durability problem.
    I hope its just this one and it doesn't happen on the replacement.
    1. View previous replies...
    2. Audio addict19
      You're not the only one. Ever since I got my pair the left ear is ALWAYS louder :frowning2:
      Audio addict19, May 27, 2013
    3. noobandroid
      my pair is also on the left side cut off problem now
      noobandroid, Jul 2, 2013
    4. onionskin
      I'll be staying away for now.  I have dealt w/ head-direct USA support and while very polite and responsive the service was glacial, I had to nag and nag and nag...
      Love their products though.  I hope they get this sorted.
      onionskin, Nov 21, 2013
  6. TommyNavara
    Natural sounding and consistent tiny package
    Written by TommyNavara
    Published Apr 27, 2019
    Pros - Natural sounding
    Really good midrange
    Tiny and lightweight
    Cons - Bass lacking
    Cannot change cable
    No controls on the cable
    WhatsApp Image 2019-04-27 at 13.51.37 (1).jpeg


    Hifiman is one those brands that you cannot forget when it comes to high quality audio, the product range is complete and unique, with premium and reference material, from the budget oriented to the super luxury.

    The main reason i like their products is because of the outstanding build quality and reliability; premium products are really expensive, but at the end of the day you get what you pay for.


    My kind thanks to Hifiman for sending me the RE400 for testing purposes. My review is not biased in any way.


    I really like the metal machinery there, precisely crafted, tiny and comfortable, during the first test i was really impressed how tiny and compact they are. The entire presentation of the earphones and accessories is nice and a really pleasing experience throughout: the casing, the foamy and velvety box inside, everything well presented and most importantly, well protected from the shipment; this is a really important feature because we have to imagine that the products travel all over the world before going into our hands. Design wise i would consider them minimalistic: the cable is not detachable, the first part of the cabling (the splitted part) is plastic only and the last part is covered with fabric, the two sections divided with the logo; L & R is printed behind the iem on the connection. On my version there is no mic nor input commands. I cannot stress enough how small they are, and in my opinion this is a good thing for a pair of all round easy fit and solid iem. I believe the connector has changed on a revision, as is now slightly different from previous model revisions, and probably more sturdy and ruggedized now. Everything comes within just 14 grams of weight, in line with other qualitatively equal models.
    WhatsApp Image 2019-04-27 at 13.51.35 (1).jpeg


    · Sensitivity 102 dB

    · Driver size 8.5 mm

    · Frequency 15 Hz - 22 kHz

    · Impedance 32 Ohm

    · Weight 14 gr

    Re-400 has a neodynium magnet and a titanium 8.5 mm driver; the loudspeaker has been designed and produced directly by HiFiMan to guarantee maximum performance of the medium frequencies. The technical specifications are in line with the earphones of the same price range; the sensitivity is 102 dB, the impedance is 32 ohms and the maximum power reaches 30 mW.

    WhatsApp Image 2019-04-27 at 13.51.36 (3).jpeg
    Inside the package we can find:

    · Hifiman Re400 In-Ear Monitor

    · 7 pairs of Silicone Tips

    · 1 carry pouch

    · 10 Replacements for the nozzles filters

    · 1 Clip

    WhatsApp Image 2019-04-27 at 13.51.36 (7).jpeg
    Two main things to consider that i really like: the pouch included is a plus, and for the tips there’s a pretty good selection of them, wether you fit bi flange, small or big tips. There are no foam tips included unfortunately, and i do not understand why the tips are presented in 2 different positions in the packaging, as if the bigger ones are a later addition to the overall packaging: some are on the front in the casing, some are inside the pouch. One thing to consider is that the 3.5mm cable is not balanced, and cannot be detached from the units, however, there’s a moderately long strain relief (compared to the tiny bodies). The included nozzles filters are a nice addition, in particluar for people with a lot of ear waxing; when they become impossibile to clean and/or ruined, you can simply change them withut worrying too much.

    WhatsApp Image 2019-04-27 at 13.51.36.jpeg

    Overall the RE400 is a neutral sounding iem, the bass is a bit recessed and needs a some burn-in to shine in my opinion. I had to put the bigger tips to seal them better into my ear canals. The presentation is spacious and well-rounded. The soundstage is fairly large, and the earphones have a fairly open, airy, and uncongested sound.


    The presentation of the RE400 is pleasant, wide and with a good overall sense of space and distance. There is less depth and height to the stage than with other multidriver iems, but the presentation is really good for this price point. Instrument separation is decent and overall very enjoyable. What i have found is a natural and pleasant presentation with great density that shines with an high level of clarity, especially with bright instruments and some particular tracks like the instruments found on the Chesky heaphone test disk.
    WhatsApp Image 2019-04-27 at 13.51.35 (3).jpeg

    I have found the bass lackluster, even if i am not a basshead myself. With a bit of burn in it gets better, and i think that playing around with the correct tips helps a lot also. Definitely not a basshead iem, but i am able to live with it. The bass is there when you need it, but is definitely not so powerful. For a straight basshead i would consider something different, even if, to my taste, this can be enough and i was satisfied with the results after the burn-in process and the discover of the correct tip for my ear canals. Bass speed, on the other hand, is tight and precise, quick to play, and doesn’t linger too long; in my opinion this is really important. Definitely not a bass oriented iem, and again, if you are a basshead just choose something else.


    Midrange is the best part of this iem in my opinion: it is very upfront and it blends very well with treble while retaining its space without going out of boundaries. The low-mids are well separated, and do not disturb some other frequencies; mids are really bright and some kind of vocals are better than the others: say for example forward female vocals are amazing: the overall result is a very open sound; obviously you miss some detail, some transparency, but at this price point, the midrange are really amazing, something that you are usually able to listen if you have an higher budget, on other brands.


    I like the treble because it’s sparkling and vivid, but not fatiguing. You lose a little bit of detail in the treble, but nothing to be worried too much. The extension is fair; overall to my ears the treble sounds good; it feels more natural and it has a good separation from the other frequencies, if you think that this is a single driver iem, the result is pretty good for the price range. I like the fact, again, that you can listen to them for hours without fatiguing your ears, i think that this has to do with the natural sounding, even if the treble are really sharp. In my opinion the treble is not affected too much from the break-in process, not quite as much as the bass to my ears; they are consistent out of the box and after 50h break-in period.

    WhatsApp Image 2019-04-27 at 13.51.35 (2).jpeg
    Overall sound impression:

    Natural is the correct word for the RE400. The iem plays the music as it should be, without over emphasizing one thing or the other. The Midrange section is for sure the best one. Bass, on the other hand, is a bit lacking and you need some break-into get some and some good isolation, especially the sub-bass region, very recessed out of the box.

    Final Impressions:

    Well presented, natural and consistent: a nice tiny package that is good for the price and everyday listening without worrying too much about special sources. Buy them if you like vocals and midrange oriented tracks, do not buy them if you are a strong basshead and you want a lot of boom out of the box. Nothing special in the accessories, but the flange selection is nice, something they added later i guess, with the carrying pouch, that is a generic one and not personalized in any way with the name of the company or logos. I really like to listen to ambient tracks on those, especially filled with female vocals.

    WhatsApp Image 2019-04-27 at 13.51.36 (2).jpeg

    PC + Fiio E07K @ Foobar 2000 FLACs

    Rockboxed Sandisk Sansa clip+

    LG G7 thinq with quad dac



    1. WhatsApp Image 2019-04-27 at 13.51.35.jpeg
    2. WhatsApp Image 2019-04-27 at 13.51.36 (4).jpeg
    3. WhatsApp Image 2019-04-27 at 13.51.36 (5).jpeg
    4. WhatsApp Image 2019-04-27 at 13.51.36 (6).jpeg
    5. WhatsApp Image 2019-04-27 at 13.51.37.jpeg
      H T T likes this.
    1. H T T
      Thank you for the thorough review. I don’t find the RE-400 lacking in bass. The RE-400, thankfully, does not have that annoying bass “slam” or artificial bass boost like so many other IEMs. Though the RE-400 is quite competent, I find the ($99) RE-600 to be much more refined alternative.
      H T T, Apr 30, 2019
    2. xxAMAROKxx
      xxAMAROKxx, May 2, 2019
  7. Moonstar
    Liquid and Relaxing like Water
    Written by Moonstar
    Published Sep 26, 2018
    Pros - Intimate and Emotional Vocal Presentation,
    Balanced Sound Signature,
    Fatigue Free Presentation,
    Very Lightweight and Comfortable,
    Lots of Ear Tips
    Cons - Sparkle,
    Treble Extension,
    Maybe too Neutral for Some
    Hifiman RE400 Waterline Review

    Liquid and Relaxing like Water

    About Hifiman:

    Hifiman was founded by Dr. Fang in New York - USA and is one of the most well-known personal audio companies in the audiophile word.

    Hifiman has a wide variety of Hi-Fi, Reference and Premium class products like Portable Audio Players, Planar Magnetic Headphones, Desktop Amplifiers and Earphones/In-Ear Monitors like the Hifiman RE400, which I will now review for you.



    I would like to thank Hifiman for providing me this sample for review purposes. I am not affiliated with Hifiman and/or any third person beyond this review and all these words reflect my true, unaltered opinions about the product.


    The Hifiman RE400 is available for 49,00 USD.

    Package and Accessories:

    The Hifiman RE400 In-Ear Monitor comes in a small rectangular box, which has a semitransparent plastic housing.

    The box includes the following contents;

    • 1 pcs x Hifiman Re400 In-Ear Monitor
    • 7 pairs x Silicone Tips
    • 10 pcs x Nozzle Filters
    • 1 pcs x Shirt Clip
    • 1 pcs x Carry Pouch


    The RE400 comes with a wide variety of silicone tips and some of them have a very unique shape like the bi-flange tips on the pictures bellow.


    The carry pouch came separately, because the box is too small to carry all accessories. I think that Hifiman has added this carry pouch after some customer feedbacks.

    The box includes also 10 pcs of Filters, which should help to protect the earphone’s inner components from dust and earwax.


    Technical Specifications:

    • Driver Type : Single Dynamic Driver
    • Freq. range : 15 ~ 21000hz
    • Sensitivity : 102db
    • Impendence : 32ohm
    • Cable length : 1.33m
    • Plug : 3.5mm 3 Pole Unbalanced (TRS)

    Design, Fit and Build Quality:

    The Hifiman RE400 In-Ear Monitor has a pretty small and comfortable housing, which has a minimalistic design. The monitor housing is in silver color and is made of CNC machined metal that looks robust in my hands.


    There is a small vent on the housing that is necessary to balance the pressure inside the housing.

    On the front of the monitor is the sound nozzle that has a dust/earwax filter on the top, which can be replaced.


    The cable of the RE400 is fixed to the monitor and is protected by relative long plastic strain reliefs where you can find also the left and right markings.


    The cable of the RE400 is relative thin but and has a fabric coating which has pretty low microphonic effect. This fabric isolation goes up to the y splitter and the rest of the cable up to the strain relief is made of regular TPU material.


    The cable has a plastic Y splitter, which sport the Hifiman branding and there is also a small metal chin slider in silver color same as the housing.


    The Hifiman RE400 has a 3.5mm unbalanced 3 pole headphone jack with a 90 degree angled profile which is protected by a plastic housing.


    The RE400 is very ergonomic due to the small and lightweight housing, which makes it ideal for long listening periods and to wear even while sleeping. The noise isolation is pretty good for an In-Ear Monitor with such a small design and has blocked much of the noise in relative noise environments like bus, train etc.


    Equipment’s used for this review:

    IEM’s : Hifiman RE400, Shozy Hibiky, Meze 12 Classics
    DAP&DAC’s : Cayin N5II, Fiio M7, Chord Mojo, Xduoo XD10, Audirect Beam


    Albums & tracks used for this review:

    • First Aid Kit - My Silver Lining (Spotify)
    • London Grammar – Interlud (Live) (Flac 24bit/44kHz)
    • Laura Pergolizzi – Lost On You “Live at Harvard and Stone” (Tidal Hi-Fi)
    • Minor Empire – BulbulumAltinKafeste (Spotify)
    • Adam Taylor – Colour to the Moon (Flac 16bit/44kHz)
    • Casey Abrams – Robot Lover (Tidal Hi-Fi)
    • Vivaldi – Le QuarttroStagioni “The Four Season” (Tidal Hi-Fi)
    • Steve Srauss – Mr. Bones (Flac 16bit/44kHz)
    • Otto Liebert& Luna Negra – The River (DSF) – Binaural Recording
    • Future Heroes – Another World (Tidal Hi-fi)
    • Lorde – Team (Flac 24bit/48kHz)
    • Tom Player – Resonace Theory “Album” (Tidal Hi-Fi)
    • Liquid Tension Experiment 2 – Acid Rain (Spotify)
    • Opeth – Damnation (Tidal Hi-Fi)
    • Metallica – Sad but True (Flac 24bit/96kHz)

    The Sound:

    This review is written after a burn-in process of approx. 70 hours and I have used the stock bi-flange silicone ear tips.


    Sound Signature:

    The Hifiman RE400 is an In-Ear monitor with a relative balanced, slightly mid-centric sound signature. The overall tonality of this IEM is slightly on the warmer side of neutral and is ideal for long listening periods due the smooth and relaxing presentation.


    The bass of the Hifiman RE400 sounds pretty clean, controlled and very linear from the sub-bass up to the lower midrange and is nor bass-light neither bass-heavy in its presentation.

    When it comes to the sub-bass region of the RE400, it shows moderate depth and rumble with average extension, which makes it not so suitable for genres like Trance and Edm music, but is good enough for jazz and acoustic music.

    The midbass of the RE400 are tight, not very boomy and have the right quantity to add some warmness to the sound and to avoid a dull presentation. The bass speed is above average and has pretty good control for an IEM in this price category.


    The midrange of the RE400 is where it really shines. It sounds smooth, forgiving and pretty detailed, especially at this price range. The positioning of the midrange is what it differs from other In-Ear Monitors in the same price class, because it sounds neither too forward nor recessed.

    The overall presentation in the midrange is missing some transparency and is slightly veiled, which doesn’t sound unpleasant; on the contrary it gives the RE400 a special character. Both male and female vocals sounding quite emotional and pleasurable, especially female vocals have a more realistic presentation due to the brightness and sparkle, which comes from the upper midrange around 2-3 kHz. Male vocals are missing a slightly fullness and depth, due to the midbass / lower midrange tuning.

    The upper midrange of the Hifiman RE400 sounds pretty controlled with a fairly acceptable level of sibilance and harshness. The song "My Silver Lining" of the group "First Aid Kid" is one of my new reference tracks to measure the stress in the upper middle range, which can be caused by female vocals, where the RE400 has done a great job.

    The Hifiman RE400 sounds more realistic and successful with instruments such as guitars, drums and contrabass those have a relatively thicker tonality, than instruments like violins, flutes, etc. that are showing a thinner character.



    The treble range of the Hifiman RE400 is very linear and balanced like the rest of the spectrum. There is a slightly boost in the 6 kHz range that is adding some clarity and definition to the overall presentation and is avoiding hollowness.

    Some instruments like Hi Hats are slightly recessed, which makes it a bit too difficult to hear, while crash cymbals have a moderate extension. The Hi Hat cymbals are quite clear to hear in genres like Jazz, but harder to define in faster tracks like metal music.

    The overall detail level of the treble range is pretty good for this price tag and extension is on a moderate level which is acceptable for an entry level In-Ear Monitor. The treble tuning is very ideal for those who are looking for an IEM that is fatigue free and ideal for long listening periods.


    The soundstage of the Hifiman RE400 has moderate expansion, while the stage shows more wideness than depth. The stage has enough space to track the instruments in most types of music with low instrument quantities, but is not that suitable for songs with higher density, such as classical music.


    Hifiman RE400 vs Shozy Hibiki

    The Shozy Hibiki has more bass quantity than those of the Hifiman RE400 that shows a more linear bass response. The RE400 has less sub-bass rumble and depth than Hibiki with faster decay and less extension, while the RE400 is slightly faster and has better control.

    The midrange presentation of the Shozy Hibiki shows a more V shaped sound signature with a more recessed midrange. The midrange of the Hifiman RE400 is more forward and intimate than those of the Shozy Hibiki. The midrange of the Hibiki has also a brighter tonality with more presence that is adding additional sparkle to the timber of the Hibiki. This relative high peak around the 3-4 kHz makes the Shozy IEM prone to sibilance and can cause to ear fatigue. This was very noticeable in the song "My Silver Lining" of the group "First Aid Kid" where the Hifiman RE400 sounded much smoother and controlled than the Hibiki.

    The treble range of the Shozy Hibiki is brighter and more pronounced in the 8 kHz region which is increasing airiness and sparkle, while the Re400 has a more natural and linear treble presentation, which makes it to the more ideal IEM who prefer less brightness and more relaxing presentation.

    When it comes to the soundstage performance, the Hibiki shows more depth, while the difference for wideness is less noticeable, maybe slightly better with the Hibiki.


    Hifiman RE400 vs Meze Classics 12:

    The Meze Classics 12 has a more V shaped sound signature than those of the Hifiman RE400 with emphasizes to the lower and upper frequency regions. The sub-bass quantity and depth of this two IEM’s is nearly identical, while the RE400 has slightly better extension.

    The bass and midbass region of the Meze 12 Classics sounds fuller and has more impact than those of the RE400 with pretty equal speed and control.

    The midrange of the Meze 12 classics sounds more recessed than those of the RE400, which has a more intimate and emotional presentation for vocals. The boost in the upper midrange region around 2-3 kHz makes the RE400 more successful with female vocals and is adding slightly more detail without to be sibilant ant harsh.

    The treble range of the Meze 12 Classics has a noticeable boost around 4-6kHz with a peak at 5 kHz that is adding more brightness, air and crispiness compared to the RE400, which has a more linear tuning. The Meze 12 Classics has treble extensions, while the Hifiman RE400 has better control and offers a more fatigue free listening.

    The soundstage performance of those two IEM’s shows not a night and day difference. The Hifiman RE400 and Meze 12 Classics are performing head to head in terms of soundstage wideness, while the Meze 12 Classics has better depth performance.



    The Hifiman RE400 is very lightweight and comfortable to wear In-Ear Monitor with a smooth and relaxing presentation. The great vocal performance makes the RE400 to a real joy, especially with acoustic songs, while listeners who prefer more bass in their tracks will be less satisfied.

    Pros and Cons:

    • + Intimate and Emotional Vocal Presentation
    • + Balanced Sound Signature
    • + Fatigue Free Presentation
    • + Very Lightweight and Comfortable
    • + Lots of Ear Tips

    • - Sparkle
    • - Treble Extension
    • - Maybe too Neutral for Some
      hieple193, ValSilva and karanehir35 like this.
    1. ValSilva
      A good iem for the price, but with one of the worst cables ever made, at least to me :)
      ValSilva, Sep 26, 2018
    2. hieple193
      Nice review. Thanks. This seem like great option for Xiaomi Pro HD's upgrade
      hieple193, Oct 27, 2018
    Setting an example for everyone
    Written by SOULSIK
    Published Apr 24, 2017
    Pros - price. neutrality.
    Cons - bass may be lacking for some


    ALL REVIEW ARE DONE @ SOULSIKREVIEWS.COM and more insightful review can be found on our site.


    If you are on a budget then you are in for some good luck because Hifiman re400 might be just for you. Hifiman claims this IEM to be the “waterline” IEM, which means, not only them but the industry should be doing THIS with 99 dollars. Bit of a big claim? But I must say, they deserve the big talk. The re400 is not only small and compact but brings you quality that you would see in much higher end IEMs.


    The Hifiman re400 was sent me for a review by audioexcellence, a audiophile store in Canada. As usual, my reviews are not bias in any way.

    ABOUT Hifiman

    HiFiMAN Electronics is a designer and manufacturer of audio products including headphonesamplifiers, and portable audio players. Hifiman is known for its high-end audio products made under the brand Mee Audio. Its most popular products include the HE-400 which are full sized open back headphones and the RE-400 which is an IEM (In Ear Monitor). Both products are supposedly critically acclaimed for their sound quality


    Divers: Titanium coated 8.5mm dynamic drivers

    Frequency: 15 – 22 Khz

    Sensitivity: 102 dB

    Impedance: 32 Ohms

    Cable length: 1.33m

    Plug: 3.5mm



    If you are in Canada, https://www.audioexcellence.ca/ is the place to go, not only for this product but for any hifi products, their price is competitive and ensures quality service. Their store is well worth a visit if you are located within the GTA.

    Internationally, amazon is your best bet far as I know.



    HOUSING: the housing is made of aluminum and is very small and compact.


    Cable: the cable is fabricated cable up to point of the splitter and then it is

    rubber/plastic material from then on. The slider is metal, which is very nice touch. It terminates in a 3.5mm gold plated right angled jack.


    Accessories: A lot of tips for any fit, however I found the comply foams to be the best. A very nice hard carrying case that is practical in size and portability is included. There are also extra filters in case you damage the filters with earwax, which is a nice touch and shows that HIFIMAN wants you to keep the IEM for a longer time.


    Overall, the build quality is exceptional for 99 dollars. From drivers to the accessories, it screams quality. Also, the isolation and fit was perfect for me. There is 2 ways to wear it. Straight in or over the ear (found the 2nd fit to eliminate any microphonic)


    This IEM would be something I would recommend my university friends that are not audiophiles because of its cheap price point and what you get for it. With the comply foams, there was much more isolation, however even with the normal tips included with the re400s, the sound isolation was enough to be used in quiet places like the library and loud places like the gym.


    GENERAL: These are neutral sounding IEMs. The bass is not as extended as modern bass heads might like it, and this might be a turn off for some people. However, the fact that you can hear the music you love, the way it was recorded, the way it was supposed to be heard for 99 dollars, is something to appreciate. If you are like me and listens to almost anything, these are perfect. You can hear these for hours and hours without any problem because there are no sibilant highs or no booming bass that might bother you in long listening sessions. Everything is clear and represented “the way they are supposed to be”

    Sound Stage: the sound stage is very intimate, which may be a good thing for some and a turn off for others. Again, priced at 99 dollars, these are exceptional in sound stage and imaging.

    Final Thoughts

    Hifiman re400 really did amaze me with its price to performance ratio. I wish to see more budget iems like these in the future. I truly believe they deserve the title of “waterline.” 

    1. Hi-Fi'er
      You may like the Ostry KC06A even more that are sub $100 which almost sound like the RE-600 and more mid forward if the RE-400 impress, they just more bass but not by a lot. I call the Ostry's HIFIMAN on steroids compared to my RE-600's. Give them a try. They won't disappoint you. I have both and love them equally.
      Hi-Fi'er, Apr 24, 2017
  9. chuck8403
    Easy to recommend
    Written by chuck8403
    Published Mar 31, 2016
    Pros - Good balanced sound, Solid build, Comfortable
    Cons - No in-line controls
    Source: Macbook 12 with Audioquest DragonFly v1.2
    Comfort and Construction:
    Overall the comfort level was good to me for an in-ear monitor. The key is to correctly size the inserts. Cord length is good for this type of ear monitor. Ended into a 1/4” plug with a 45 degree angl. For use on an iPhone or iPod, this may be a slight distraction. The cord is sturdy. Seemed to have good thickness without being too thick. There are no controls on the cord. This could be a deal-breaker for some.
    Overall, the RE-400 has a good sound. The highs are crisp and detailed. The mids are solid. It does lack base, but most in-ear monitors will be the same. Isolation is good for an in-ear monitor. No active noise cancellation, but with a good fit using the correct inserts, the isolation is satisfactory. I was impressed with the clarity of these. Good sound separation.
    Easy to recommend if you are looking for a reasonably priced in-ear monitor. Good sound and comfort. Need to decide if the angled plug will detract or lack of in-line control forces another choice.
  10. vaibhavp
    Very good overall
    Written by vaibhavp
    Published Nov 19, 2014
    Pros - tactile balanced sound, good details for price, light and comfortable that looks good as well.
    Cons - a little lacking in sub bass.
    I have been using RE400 for over few months now. these are rather well known and well documented so I will only put stand out points that I think make it unique.


    Light weight, made out of aluminium. Chord is fabric covered below y splitter. above that its plastic. no microphonics if i wear them from above my ears. Otherwise it can be bothersome. Jack is 45 degree. Overall looks solid and mine is working well without problems.

    Comfort and isolation:

    Comfort is above average. Isolation is great if I use comply tips, otherwise I think its above average. I do need to insert them a fir bit in my ears to get a good seal, more than other IEMs I have used.


    Two words that best describe the sound is: Tactile and balanced.

    Bass is present and slightly lifted thus gives instruments slightly more realistic feel. Bass is Fairly transparent and conveys what was played well enough. Its fairly tight, though I do find sub bass lacking a bit.

    Mids are well balanced with bass. Its not a huge soundstage and mids sound rather intimate. Slightly lush, overall maintain neutrality.

    Treble is extended and can be delicate or harsh depending on source, with fair amount of resolution. Again nothing alarming, its not a bright sound to my ears.

    Amping: Rather strange in amping department (I guess its common with iems). Sounds best out of my PS Vita, a gaming console, compared to my phone or amp. Detail retrieval drops when used with either compared to my other full size hps, that sound best out of amp.

    Value: Overall amazing. I has quiet a lot of hype surrounding it. I do think if you factor everything, comfort, accessories, sound, its very good $100 iem. Taken only in terms of sound, will it beat a $200 hp? I don't think so. But I do think its very competent hp for $100 and a great value.
    1. yalper
      it's a love and hate relationship my experience with RE400 :)
      yalper, Nov 19, 2014
    2. vaibhavp
      i do like them and use them for portable use. definitely thumbs up from me.
      vaibhavp, Nov 20, 2014