Head-Fi.org › Head Gear › Headphones › Over-Ear › Massdrop x HIFIMAN HE350 › Reviews › moedawg140's Review

Review: Massdrop x HIFIMAN HE350

A Review On: Massdrop x HIFIMAN HE350

Massdrop x HIFIMAN HE350

Rated # 274 in Over-Ear
See all 7 reviews
Review Details:
Audio Quality
Posted · Updated · 60838 Views · 63 Comments

Pros: Tenacity and pinache in the upper midrange and treble areas, soundstage is surprisingly immense, solid construction

Cons: Bass has quality but not much quantity, treble may sound bright to very bright, especially upon first listen

Review: Massdrop x HIFIMAN HE350







It has been such a vibrant time in the Massdrop landscape, as they have been able to create successful collaborations with respected manufacturers.  Massdrop and AKG with their smooth sounding K7XX.  Massdrop plus Fostex with their richly immaculate TH-X00.  Enough of a success to spawn a new TH-X00 variant that contains Purpleheart earcups, and delegating the old model to a new name: the TH-X00 Mahogany, to be able to differentiate between the two models. When I had a chance to listen to the new collaboration with HIFIMAN headphone, I jumped at the chance and feel honored to be considered.  Thanks to Christian, aka @CEE TEE, for the Massdrop x HIFIMAN HE350 in exchange of my honest opinion.  Also, congratulations to his new job with Massdrop as Audiophile Custom Products Manager!  Much success to Christian and thanks to @WillBright as well, bringing those who purchase Massdrop's audiophile products along the journey with you both, one person at a time. 


According to Massdrop:


In 2010, HiFiMAN released the HE-300, HE-500, and HE-6, a series of headphones that rivaled those from the world’s most established brands and redefined price-to-performance expectations in their respective categories.  This product line solidified the still-young company’s status as one of the most respected names in the audiophile community.


Today, we’re proud to announce the Massdrop x HiFiMAN HE-350, a custom product based on the company’s entry-level HE-300, which was eventually discontinued despite being a clear favorite for many.  This model has everything you loved about the original, plus a few awesome updates made in response to feedback and requests from the community.


With regards to the drop, there are a couple of weeks left, and will cost $99.99 shipped in the United States.  International shippers can use a forwarding partner for an additional charge of $15.  Here is additional info from Massdrop with regards to international shipping (if you live outside the United States):


Note: If you're an international customer looking to partner with a shipping forwarder, please read this FAQ.  At checkout, international orders will be charged $15 for the third-party freight-forwarding service. You will need to input your shipping address as per a normal drop.


Expected ship date is August 3, 2016.


Here’s a little more info as well from Massdrop:


The HE-350 uses entirely new dynamic drivers, different from those in the HE-300, resulting in a more neutral sound signature with less distortion and more detail.  We've also improved the cable connectors and plug, and updated the frame to HiFiMAN’s latest (and much lighter) structure.  We made the headband more comfortable for those long listening sessions, and changed the colorway from black and silver to a more understated black and gray.


Best of all, we’re able to offer the HE-350 at an even more accessible price point.  How accessible?  We’re talking $99.99 shipped to your door in the United States.  Developed in collaboration with our friends at HiFiMAN, this will become the entry-level audiophile headphone recommendation.


Let’s check out the HE350 and find out if it is detailed in presentation, constructed with thought and structured materials, and if I feel this will become the entry-level audiophile headphone recommendation.  Come along the journey with me to audio bliss…



Audio equipment used in the review




Massdrop x HIFIMAN HE350: $99 Shipped in the US ($15 extra for international orders)


Headphones mentioned and compared


1MORE MK801: $79.99

Fostex x Massdrop TH-X00: $399

Grado Labs The Prestige Series SR80e: $99

HIFIMAN HE1000: $2,999

Master & Dynamic MH30: $349

Master & Dynamic MH40: $399

Puro Sound Labs BT5200: $129.99

Sennheiser HD 598: $249.95

Sennheiser Momentum 2.0 AEi: $349.99


Headphone earpads


Brainwavz Audio Headphone Memory Foam Earpads - Angled, Pleather: $26.50

HIFIMAN Leather Earpads: $20.00

Stock HIFIMAN Velour Earpads: $10.00


Modding material


Paper towel




iPhone 6 (Space Gray, 128GB):  $849.99 or $399.99 with a 2-Year Contract

Microsoft Surface Book: Starting at $1,499
Questyle Audio QP1R Golden: $899 USD




iFi Audio micro iCAN SE: $299

iFi Audio Pro iCAN: $1,695


Software applications used


Sound Level Analyzer: $4.99

Spotify Premium – Extreme Setting

TIDAL HiFi – Lossless



About the editor (Click to show)

Thanks for the interest!  I have been a music aficionado since first listening to greats such as Anita Baker and Michael Jackson in their glory years.


An avid wrestler, coach, teacher and mentor, I like to immerse music lovers in headphones, earphones and sources that do nothing but make the listeners smile.


Ringing in my ears?  Oh, tinnitus?  I get that about 2 times a year, for about 10 seconds each time.  Other than that, I’m currently good to go with regards to my hearing.  Even if my hearing is perfect or not so perfect, what I hear may or may not match what you hear, for a multitude of reasons (genetic, physical, psychological, age, etcetera).


My music preferences are anything that has a great beat to it, not too vulgar in nature and anything that can induce head-bobbing, toe-tapping and maybe even dancing if the mood is right.  I normally listen to (alphabetically): Alternative, Classical, Hip-Hop, Indie, Popular/Top Hits, Rock, and R&B/Soul.  I will even from time to time listen to Blues, Jazz, Modern Electronic, Retro/Classics, and World.


Measurements - I measure headphone output dB with my decibel measurer app that anyone can download, replicate and have an instant reference with what I use to test.  Frequency spectrum measurements are seldom posted, as the manufacturer’s measurements are usually the best guidelines to go by.  Why?  They use them to tune their equipment, and it’s from their own specific parameters.  I completely agree with Ken Ball from ALO’s statement/post when it comes to frequency response measurements (verbatim):


“…I thought it might be good to post some frequency response measurements first before we see a lot of variations posted by people. Without going into a long drawn out thesis / debate on measurements I just want to say that I have not seen any reviewers measurements that are accurate and it can be difficult to interpret a freq measurement. I don't use HRTF compensation curve on my measurements because I am familiar with the raw freq curve so when I see a curve I know what it sounds like and am comfortable with what I am seeing. So to state my measurement so I can be happy that this is the official freq I am posting it here now. I do not really want to get into any debates on what the freq means or read into it too much as a freq measurement is only a very small part of the over all picture of the product. I would MUCH rather listen to the IEM than read a freq.


In addition, I dont want to sound like I dont welcome people to also have fun and measure, but just want to say that taking a accurate measurement is tricky, also tricky to read into the measurement. I spent over $15,000 on on measurement system and it took me almost a year with professional help to calibrate and set it up 100%. So in doing so it is expensive and can be difficult to set up and calibrate. I know my set up is accurate because I send my IEMs to independent labs to double check everything.”


Measurements are valid to possibly get a glimpse or gist of what we are hearing, but measurements are not the end all be all.  Various manufacturers have told me privately that even though it may measure flat, it may not sound flat.  Also, measurement devices do not equal our brain and cannot measure with absolute 100 percent certainty with regards to what we hear and feel.  I listen with my ears, and write based on my interpretations of the music that is being presented to me.


A wise man once told me: "Music is the only thing that doesn't have war, pestilence, garbage, crap - music is so general, it's such a beautiful canopy of peace."



First listen


When I received the HE350, I went through a brief listen, and then connected it to various sources to burn in the headphone.  I normally burn in all of my earphones and headphones I receive, but I really wanted to hear if there were changes through this particular model.  More about this later.



Build and aesthetics


HE350, HE350 connected to QP1R



HE350 velour earpad, inside of HE350 headband



HE350 side view



HE350 connector socket, HE350 earpad off of earcup



HE350 earcup and earpad



HE350 - right and left sides



The glossy black frame of the headband is built very well and the black headband itself is tastefully created with contrasting white embroidery, using stitching to hold the slight padding of the headband intact.  The headband mechanism offers five settings; a rather tight fit from its furthest down setting, on up to a very generous fit for the largest of heads with its fifth and highest up setting.  A large “H” shows the HIFIMAN logo at the ends of the headband, and the top of the yokes show “HE350” on the left and right of the headphone.  The yokes are made out of plastic, but has a satisfying solid feel and matte look to them.  The earcups have a gunmetal look, and have a fine-looking gloss to them as well.  The grills are glossy black, and are see through just enough to see a little bit of the inner workings of the headphone.  The earpads are black velour and look to be of high quality.  The cable connectors of the HE350 look to be of high quality, as do the black 53-inch cable with right angled plug.  This headphone might as well be called the Batman because of its mostly slick gunmetal and black appearance.


HE350 and HE1000




Fit and comfort


The adequately sized and lightly padded headband, velour pads, light total headphone weight, coupled with a better overall fit than my HIFIMAN HE1000 makes the HE350 one very comfortable headphone to wear.  The earcups rotate a full 180 degrees and pivot just over 180 degrees, meaning the HE350 provides a full range of movement for just about every type of head in existence.  The only issue that I foresee listeners having is with the velour pads.  I personally don’t have issues with it as I am used to wearing wrestling head gear that gets very hot and sweaty, but some listeners that aren’t used to the velour padding of headphones may feel that the pads will get warm or hot with extended listening sessions. 


The 53 inches of cable length is great for listeners on the go, and the fact that the HE350 offers detachable connectors standard is a welcome aspect, especially for listeners directly coming from the beautiful sounding Fostex x Massdrop TH-X00 Mahogany headphone, which has fixed cabling standard.


HE350 cable - left, HE1000 cable - right


With regards to the fit of the headphone, I personally find the most comfortable fit of the headband the second or third lowest setting.  Each setting holds rather strong, so changing to and discovering your individual setting is a joy to obtain.



Glasses and the HE350


I tried the HE350 with sunglasses to test if they feel comfortable while the HE350 is on my head.  I tested with the Oakley Offshoot, which have larger stalks than regular eyeglasses.  The HE350 puts a little pressure on the Offshoot stalks, but isn't a concern with regards to pain or anything of the sort.  Your mileage may vary, especially since different sized heads, eyeglasses, tolerance to wearing eyeglasses with headphones and other factors will all come into play.


Oakley Offshoot, HE350 on head with Offshoot




How to replace earpads


There are four grooves of each earpad that need to come out of the indentation of the earcup.  Once you locate one to take off (push earpad portion closest to you away from you), the rest of the earcup is very easy to take off.  To put the earpad back on, repeat the process, inserting the groove of each earpad into the indentation of the earcup.  Make sure there is no play with any part of the earpad once it’s fully on the earcup.  If there is play, you’ll need to reinsert a groove or grooves into the earcup until there is no play with any part of the earpad.


Push earpad portion closest to you away from you to take earpad groove off



Earpad off of earcup housing


Repeat process by inserting earpad grooves in earcup indentation


HE350 earpad replacement procedure in video form:



Disclaimer and hearing factors


The HE350 sound impressions are mainly for anyone wanting a point of reference regarding how they more or less pair with the iPhone 6, QP1R and Surface Book.  Other sources may vary slightly or greatly as the HE350 sounds different enough with these three sources to warrant mentioning.  The HE350 will have a warmer and pronounced effect in the overall bass region when pairing with the iPhone 6.  The HE350 will have a supremely detailed with slight treble and bass with extended detail when paired with the QP1R.  The HE350 will have a more balanced and natural sounding approach to its presentation when paired with the Surface Book.  For reference, the HE350 is fairly easy to drive, as a smartphone such as the iPhone doesn't take full volume for the HE350 to emit levels that can damage hearing pretty quickly. 


We all hear differently, and our experiences with regards to how our interpretation of what we hear vary greatly.  Some factors that come to mind (and not limited), are: 


Your inner ear and skull’s overall composition: http://www.smithsonianmag.com/smart-news/the-unique-vibrations-of-your-skull-affect-how-you-hear-music-654940/?no-ist.


Hearing loss as we age, also known as presbycusishttps://www.ohio.edu/news/months/nov1998/111.html,https://en.wikipedia.org/wiki/Presbycusis.


Heredity, noise trauma, dietary habits, smoking, hypertension, atherosclerosis, are other factors that affect people’s overall hearing ability.



Analyze this and that


The test tracks that I use in my reviews are located in these albums (album alphabetical order)


1989 (Deluxe Edition) by Taylor Swift (FLAC 44.1kHz/16bit)

21 by Adele (FLAC 44.1kHz/16bit)

Bad (2001 Special Edition) by Michael Jackson (FLAC 44.1kHz/16bit)

Bangerz by Miley Cyrus (MP3 320kbps/44.1kHz/16bit)

Beyoncé by Beyoncé (FLAC 44.1kHz/16bit)

good kid, m.A.A.d city by Kendrick Lamar (FLAC 44.1kHz/16bit)

Heart Blanche by Ceelo Green (MP3 320kbps/44.1kHz/16bit)

Hybrid Theory by Linkin Park (FLAC 48.0kHz/24bit)

Make Yourself by Incubus (MP3 320kbps/44.1kHz/16bit)

No. 5 Collaborations Project (EP) by Ed Sheeran (MP3 320kbps/44.1kHz/16bit)

One by One by Foo Fighters (FLAC 88.2kHz/24bit)

Random Access Memories by Daft Punk (FLAC 88.2kHz/24bit)

Schubert  Berliner Philharmoniker by Nikolaus Harnoncourt (FLAC 48.0kHz/24bit)

The Dark Side of the Moon by Pink Floyd (FLAC 44.1kHz/16bit)

Thriller by Michael Jackson (DSD 2822.4kHz/1bit)

X (Wembley Edition) by Ed Sheeran (FLAC 44.1kHz/16bit)


Several standalone tracks (track alphabetical order)


Dock of the Bay by The Persuations  A Cappella Dreams (WAV 44.1kHz/16bit)

M.O.R. by Blur  Blur 21, Blur (2012 Remaster  Special Edition) (MP3 320kbps 44.1kHz/16bit)

Schubert String Quartet No. 14 in D minor D. 810, Death and the Maiden: III. Scherzo. Allegro molto by Oslo String Quartet – The Schubert Connection (DSD 2822.4kHz/1bit)

Serenade (Spanish Dance), Op. 54, No. 2 by Jano Starker and David Popper – Wilson Audio Ultimate Reference (APE 44.1kHz/16bit)

The Peppery Man by Natalie Merchant – Leave Your Sleep (WAV 44.1kHz/16bit)

These Bones by The Fairfield Four – I Couldn't Hear Nobody Pray (WAV 44.1kHz/16bit)


If I am listening to a product that is not able to be listened with the highest resolution tracks that I have mentioned, I will listen to the TIDAL versions (FLAC).



Sound impressions


Remember earlier in the review when I said that I wanted to find out if I observed changes with burn in?  Based on the time I’ve currently burned in the headphones so far (around 125 hours) I haven’t noticed too much change as the inherent qualities of the sound have stayed more or less the same.  The HE350's sound signature produces an upper midrange and treble emphasis.  This is a bright sounding headphone.  No sugar coating in this regard.  Highly resolute, with a crisp and detailed prominence.  Midrange is slightly recessed and bass has quality but also takes a step back in quantity.  The open back nature helps create a soundstage that I feel is unrivaled at this price point.  The clarity is outstanding for a dynamic driver and exemplary, especially in the treble areas.  Some may think that the large size of the drivers (50mm) would play a part in creating more bass to the sound signature.  This is not the case with the HE350.  What I will say the size more than likely helps to convey more of a full and wide soundstage, which is a welcome effect in my book.  Will my sound impressions match yours?  Who knows, but there is no denying the fact that they are inherently bright, may be slightly sibilant at first listen, and the soundstage and quality of music that is presented is apparent.


The treble is the captain of the ship, and will be either be loved and adored for many years to come, or loathed and reviled as one of the most treble/upper midrange heavy headphones you may hear (aside from Grados).  The high frequencies are crisp and the open back creates an open and airy experience.  It really is a nice experience, especially if you want to take a detour away from pure reference or bassy sounding headphones.  If you are a lover of treble, purchase the HE350 because it will reward with oodles of treble, and probably then some.


Upper midrange, where art thou?  Yes, right here.  And there.  And seemingly everywhere.  Whew, when paired with a detailed and resolute source, the upper midrange exhibits itself with such a voracity it seems, but is toned down somewhat to my ears once a little burning in and also brain burning in comes into play.  Vocals are vibrant, rifts are obvious and guitars sound dynamic.  I can listen to the HE350 for hours without any sibilance or too-bright issues, since I have gotten used to the bright and open sound of the beautifully created headphone.


The lower frequencies can exhibit a sheer softness, but does not sound muffled – rather, it sounds articulate, yet gentle.  As you can tell by now, this is not a basshead headphone or anything near the sort.  For those that want to take a break from the bassy headphones of the world and hear adequately accurate, yet subdued in rapaciousness compared to bassier headphones, the HE350 is the one to audition.


I feel the HE350 portrays good depth of field, but excels in the soundstage width department.  The upper midrange and open back characteristics aid in creating that air, that breath; that aura, if you will.  It really is a great sound and feeling once you dial in your favorite source and music.


With regards to sound leakage, the HE350 leaks a lot of sound, as its open-back construction would be a great choice to annoy co-workers and people around you - and not a great choice if you value the peace and serenity that an alternatively chosen closed-back designed headphone inherently produces to those around them.


My wife listened to the HE350 for a few minutes listening to some tracks off of the QP1R, and I asked: "How do you like them?"  She says "It sounds fine.  It doesn't have a lot of bass, but sometimes you don't need a lot of bass."  She ends with: "It's better to sound bright than dull!"™


Here's my impressions of the HE350 in video form:



iFi Audio micro iCAN SE


The micro iCAN SE is an amp that produces a defined and resolute sound signature, especially when coupled with the QP1R.  Detail is palpable, and the micro/macro detail of the HE350 truly shines.  The "3D HolographicSound" setting helps add in a little more forward, rich and transparent sound field perception.  iFi Audio explains: "3D HolographicSound recreates a holographic sound field like listening to a pair of speakers."


Here's the 3D HolographicSound settings:

 - = Direct
●●● = 3D for flat sounding recordings.
● = 3D for recordings with excessive stereo effect.


I only need to turn the volume dial a little (to around 9 o' clock) to obtain a comfortable listening level.  The micro iCAN SE also features a Bass Boost switch, called "XBass".  iFi Audio explains: "XBass was uniquely-designed to extend the bass response to suit different headphones."


Here's the XBass settings:

- = Direct

●●● = For bass shy headphones.
● = For average bass headphones.


XBass is my favorite setting on the amp because I can immediately hear and feel a change in the bass response (increased volume of bass, texture and decay).  


At the one dot setting, I personally feel the HE350 doesn't benefit too much with this setting.  A little more bass is apparent, but is still not bassy enough to my ears, as the one dot setting is best for average bass headphones.  The HE350 is in my opinion a bass shy headphone, and would benefit the best with using the three dot setting.  With that said...


Using the three dot setting adds more volume of overall bass and on certain tracks has bass that can be heard, felt (not immensely, but sufficiently), and there is more perception of prolonged reverberation and decay.  The three dot setting doesn't turn the HE350 into a basshead headphone (at least without source EQ applied), but it turns the HE350 into more of a balanced sounding headphone.  The result of the three dot setting is creamy-smooth sounding bass that melds naturally into the highly detailed midrange and higher frequencies.


iFi Audio Pro iCAN


I wanted to try out the HE350 with a balanced amp, so I used my HE1000 balanced cable with the HE350, connected to the Pro iCAN I had on loan for a couple of weeks. My favorite settings are:


Tube+ selected ("2 x NOS GE 5670s are engaged with the J-FET circuitry switched out for an all-valve Class A operation": "Even Order harmonics dominate")

XBass selected to "40Hz" (Max Bass setting)

3D selected to "OFF" or "90/60+" (Max Loudspeaker Angle setting)

Gain set to 0dB


The Pro iCAN is connected to the QP1R as the source.  The resulting sound is utterly transparent, fluid and the smooth presentation is resounding.  Delicate, yet full of depth and dynamic in nature.  Seriously blissful sounding and truly brings out every last drop of the technical capabilities the HE350 is able to emanate.  The GE 5670 brings out the warmth of the HE350 with no inherent brightness, just a more clear view of the treble as it has been softened to seemingly refresh the senses.  Bass is fluid with adequate heft because of the "40Hz" setting.  The midrange is gentle and lush.  Soundstage and spatial capabilities?  Pretty breathtaking; natural, spacious, and transparent, in my opinion.  The combination is truly an eye opening experience.  No hype here, just sweet sounding truth to my ears. 


Gaming: Microsoft Surface Book


The HE350 performs well at least with certain genres of games that I like to play such as racing and fighting games.  The soundstage and pinpoint cues are excellent to my ears and are an easy, non sibilant listen with the Surface Book.  The below titles were observed by watching YouTube gameplay videos.


First Person Shooter

Counter Strike: Global Offensive


From the different types of gunshots, smoke screens, hand to hand (knife fighting), soundstage and sound position of all are excellent.  A joy to watch and listen to the CS:GO Cologne Grand Finals.  "Team EnVyUs" is simply relentless, with unabashed aggression.



Forza Motorsport 6 


The acceleration, shifting, screeching tire skids, braking, sliding, safety cone hitting, car to car smashing and background music are all pretty immersive, with clarity and detail.  Fantastic to listen.



Street Fighter V


Everything about listening to Street Fighter V sounded hype!  Seriously though, It isn't as though you feel each punch, kick, projectile and throw with a sheer immense bass presence, but the clear and expansive technicalities behind it all sounds delightful. 



Headphone comparisons


Before I start with the comparisons; I have listened to a lot of audio equipment, but I haven't listened to everything.  If you request a comparison and it's not listed in my profile and hasn't been reviewed, then there is a chance that either I haven't listened to it in a long while and don't want to compare by memory, or I don't have the requested product(s) with me to compare.  Consider being proactive by sending me a PM (private message), sending me the headphone(s) and/or sources, IEMs, etcetera, you would like for me to compare, and I'll add it to the review (or any review that I've written).  If you don't have the requested product(s) with you and I don't have the requested product(s) with me, chances are slim that I will be able to fulfill your request because I always like to A/B with audio equipment that's immediately on-hand.


My headphone comparisons are volume matched as close to the 0 to .1 dB discrepancy of the two A/B compared headphones as I can; to read my full method, check out the (Q15) Decibel Measurements, Disclaimer and Headphone Comparisons section in my Questyle Audio QP1R review




There is more treble emphasis from the HE350, and the MK801 has a meatier midrange with more quantity of bass.  Soundstage, layering and spatial factors all tailor to the HE350, mainly because of the open back nature compared to the closed back nature of the MK801.


Fostex x Massdrop TH-X00 (Mahogany)


The TH-X00 has much more quality and resonant bass, midbass and midrange.  The HE350 on the other hand, shines in the upper midrange, treble, and slightly edges it out in the soundstage factor due to the open back nature of the HE350.  These are two very different sounding headphones, and come down to your preferences: do you want a liquid midrange with high quality and quantity bass, then then TH-X00 is the one to get.  If you want high frequencies that seemingly bursts with auditory flavor, then the HE350 is the one to get.  Or, purchase both of them, since they are both different enough to tailor to different moods and preferences.


Grado Labs The Prestige Series SR80e


SR80e vs HE350 with Stock Velour and BAP - The fit of the SR80e is lovely, as it is very lightweight, and the foam earpads (“cushions”) are old school in nature but are nonetheless comfortable on my ears.  The SR80e is lighter than the HE350, but the HE350 feels sturdier as a whole.  The SR80e is a pretty bright sounding headphone, brighter than most headphones that I’ve listened to.  The SR80e is brighter sounding than the HE350, but not outrageously so.  There is more pronounced bass and a more in-your-face sound as a whole with the SR80e.  There is more of a V signature of the SR80e compared to the more balanced sound of the HE350.  I would even say the HE350 sounds slightly more laid back than the SR80e.  The SR80e has a dynamic sound with pretty good midbass for a lightweight and soft-feeling headphone.  The midrange is somewhat recessed compared to the treble.  The higher frequencies are vibrant compared to the HE350, and are slightly peakier in nature.  Replacing the stock velour earpads with the BAP makes the HE350 bassier and tames the treble, but is still not quite the bass quantity comparatively of the SR80e.  Soundstage of the SR80e is adequate, but is not exceeding transparent, especially when compared to the more spacious feeling of the HE350.  My take from both are that the SR80e is a more energetic sound, and the HE350 is a slightly more resolving and balanced sound.  The SR80e is a dynamically bright, yet merry sounding headphone, especially for the price.





Why am I comparing a $99 headphone to one of the top of the line headphones in the world?  Why not!  When it comes to fit, I will admit it – the HE350 has got the HE1000 beat.  The headband of the HE350 fits normal-sized heads, as the HE1000 seems to want to fit abnormally-sized heads, as evidenced by the sheer height of notches the headband can rise up!  However, when it comes to sound, the HE1000 bests the HE350 at most all areas – bass is more resounding, rich and a joy to listen to with the HE1000.  The midrange of the HE1000 is full, slightly laid back and liquid, all rolled up into one.  The treble is more apparent than the HE1000, and the soundstage is surprisingly large – not quite as large as the HE1000 – but still makes you want to give a smile when you hear and feel the soundstage physiognomies of the HE350.


Master & Dynamic MH30


The MH30 exhibits more bass and midrange than the HE350.  The HE350 emits seemingly heaps more treble than the MH30.  The HE350 and MH30 can best be described as polar opposites.  The MH30 is bassy and almost primitive in nature, and the HE350 is comparatively enveloping and transparent in the upper frequencies.


Master & Dynamic MH40


The MH40 is more towards the HE350 tonally compared to the MH30, but it’s still not quite there.  There is still a lot more bass and midrange emphasis than the HE350.  There is more treble out of the MH40 out of the MH30, but cannot hold a candle to the sharp, steely and as you listen more, smooth nature of the HE350’s treble and upper midrange.


Puro Sound Labs BT5200


This headphone is similar to the MH30, but with slightly less all out bass presence, which means there is still a lot more bass and midrange presentation compared to the HE350.  The upper midrange, treble and soundstage is where the HE350 shows its true chops, making some bassier headphones, including the BT5200, give a congratulatory bow to the presence of the brilliant nature of the HE350’s upper midrange and treble.


Sennheiser Momentum 2.0 AEi


The Momentum 2.0 AEi has more of an overall balanced sound than the HE350, with the bass emitting with more punch and slam, midrange that is more in your face, and treble that is smoothed over in the uppermost frequencies.  The HE350, and its open back nature does have a wider soundstage, enhanced imaging and crisp sounding upper midrange and treble than the Momentum 2.0 AEi.


Sennheiser HD 598


The HD 598 is lightweight and comfortable with a headband that is soft with small slots that probably allows for better airflow going around the top of your head.  At least, that's what it looks like.  It's a nice design, nonetheless.  The HE350 is comparatively larger than the HD 598, but still similar in weight and comfortable on the head.


You are going to receive more visceral bass from the HD 598 with more slam.  Quality of bass is similar, but the HD 598 deals with subbass better because of the more inherent bass rendering capabilities.  This is pretty much where the HD 598 has a clear advantage (if you value more bass) over the HE350.


The midrange of the HD 598 is grittier and less resolute than the HE350.  The HD 598's midrange is warmer, more closed in, and sounds syrupy compared to the resolute and less viscous nature of the HE350's midrange.


Moving onto the higher frequencies, there is not much comparison, at least to my ears.  The HD 598's treble rolls off much earlier than the HE350's far-reaching tendencies.


Extension, depth, crispness, coherency, transparency and perceived soundstage all favor the HE350 when it comes to treble comparisons.  Layering and separation of not only various instruments, but vocal presence favors the HE350.  Treble presentation, soundstage perception, and other intricacies are areas where the HE350 will most likely have over a lot of headphones, at least in its $100 price range.


Overall, the HD 598 emits a decent sound with adequate bass, and the HE350 emits a more micro and macro detailed, and harmonious sound than the HD 598 to my ears.  Using the BAP, bass is bumped up and sounds not very far off from the bass of the HD 598, but wouldn't argue that either or can be perceived as more when connecting to various sources.  Overall sound signature, depth, balance and resonance are enhanced as well with the BAP compared to the stock pads, which makes the disparity between the two headphones a little bit wider, in my opinion. 



All of the headphones compared are amazing sounding, and are prodigious in their own manner, regardless of form factor (closed/open back) and price ranges relative to the HE350, especially when paired with a favorite source.


Pro iCAN and balanced HE350



Should you modify?


It’s really up to you.  By now you should know that having this headphone as part of your collection (or only headphone) that it is an upper midrange and treble deity.  With that said, you may want to dial in modifications to help bring out the bass as well as taming down the treble in the process.  What can you do? 


  1. EQ – use your source’s EQ settings to dial in a preferable frequency response to your ears.
  2. Bass Boost or equivalent – use your source’s Bass Boost or equivalent button or switch, as you can with a button press or flip of a switch have immediate results with increased bass with the expense of probably lower perceived treble - which is what you want anyways, right?
  3. Earpad change – changing the earpads may change the frequency response to one that sounds better to your ears.
  4. Third-party elemental cables – copper, SPC, silver/gold or silver litz, etc. may help further refine the sound signature of the HE350.
  5. Physical modifications (be careful and focus on reversible mods first!) such as changing the grill, adding foam, felt, different materials and densities can make for a very fun project to help create the sound that ends up sounding utterly amazing.


I personally won’t be modifying as I am thoroughly enjoying the unique sound signature the HE350 produces, but would like to hear upcoming modified HE350s at future meets when people may bring them in tow.  I take that back: I purchased a couple of earpads, now use the Brainwavs Headphone Angled Memory Foam Earpads – Angled, Pleather, and found adding material helps tame the treble and increase bass.



Meeting of the musical minds


The Source AV Design Group is a location in Torrance, California, where you can listen to lower to high priced headphones and amplifiers, on up to multi hundred-thousand-dollar speaker systems.  Their showrooms are positively ridiculous, with one in particular sounding better and more visceral than some dedicated movie theaters! 


I attended the first of many Summer Series events at the location, the link to the events thread is here: http://www.head-fi.org/t/807600/cavalli-audio-presents-the-source-av-s-summer-series-2016.  I brought some gear to the meet, and wanted to obtain a few impressions from my friends, most of which are Head-Fi members. 


Overall impressions: Most all who listened thought the treble came off as bright sounding, and one said they thought there were issues in the treble area.  All said for the price, the sound is great.  @Bones1885 says “for the money they are damn good.  Some stuff comes off a little sparkly, but for the money, hey?”  @Gilly87 also says he can’t think of any headphones up to the $300 range that can even touch the HE350 (especially after the modifications were implemented).  An argument/debate ensued, and I think the HE350 held its own.



Earpad synergy


Speaking of modifications, @Netforce brought his Brainwavz Headphone Memory Foam Earpads – Angled, Pleather to try.  In order to use it with the HE350, you are going to need to either use the earpad rings from the stock velour pads, or purchase a HIFIMAN set of pads and then use the rings from those to put in the Brainwavz Angled Pleather (I’m going to call them BAP from now on) pads.  I asked @Netforce why he chose specifically the BAP pads.  He said because he wanted a compromise between the large Alpha pads and small Focus pads that he didn’t really enjoy with his HIFIMAN headphones.  I am used to the pleather TH-X00 angled pads, so I felt right at home with the BAP and HE350 on my head.  After all is said and done, I purchased the BAP as well as the stock HIFIMAN leather pads (stock on HE-500 and HE-6 headphones [source, HIFIMAN’s online store]) for myself, and will be using the BAP as my main HE350 earpads. 


The BAP and HE350



BAP dimensions - left/top, BAP top plus side views - right/down



HIFMAN leather earpad dimensions (photos below)


Inner Diameter: Approx. 59 mm/ 2.32 in 
Outer Diameter: Approx. 105 mm/ 4.13 in 
Thickness: 24 mm/ 0.94 in 
Weight (pair): 33.8g/ 1.19 Oz/ 0.07 lb




Earpad replacements


I received the BAP and HIFIMAN leather (pleather) earpads, and both are great in their own way.


BAP to the left side, and HIFIMAN leather earpads to the right side



BAP and HIFIMAN leather earpads



BAP side view



Stock velour earpads and HIFIMAN leather earpads



Stock velour earpad on the left and HIFIMAN leather earpad on the right



HIFIMAN leather earpads



The HIFIMAN leather earpads are great if you want the same size and fit as the stock velour pads, but want a leathery feel instead of the velour of the stock pads.  Bass is improved just a tad, not very much, but feels better to my ears than the stock velour pads.


Moving onto the BAP, I took out the rings of the HIFMAN leather pads and put them in the BAP, which comes with no rings, only the earpads themselves.  Here’s the process:


Installation: looks like it can't be done, but it can!



Nice and easy, slowly easing in the ring, stretching/moving the earpad material as you insert more ring inside the earpad material



Keep moving the ring inside slowly as to not damage the earpad material


Make sure everything is nice and smooth inside and out


BAP installation finished


BAP: Without ring on left, and with ring on right


BAPs all finished - the BAP replacement should take a couple of minutes until it comes out looking great



Bass is more improved than the stock velour pads and the HIFIMAN leather pads to my ears, and puts the earcups at an angle on your head as well due to the angled nature of the BAP.  Some may be happy with just the earpad change, as the treble doesn’t sound as peaky to my ears compared to the stock velour pads.


In athletic (and other categories) terms, I would say the HIFIMAN leather pads would be an intermediate replacement (material change), and the BAP would be an advanced replacement (material and earcup angle change).  


My favorite is the BAP, since bass is improved, treble is slightly less peaky, and the overall sound is more to my preferences in comparison to the stock velour pads and HIFIMAN leather.



An observation


After my wife listened to some music from my iPhone 6 and the HE350 with BAP only, she said it makes the Formation by Beyoncé song have a different type of presentation.  I asked "What do you mean?" She replies "The headphones make it sound better than what you would normally hear on the radio."  I said "Pretty nice sound that's coming out of this headphone, only $99 shipped for those who purchase it".  She said "Really?  That's great, I thought for sure this was one of your more higher-priced headphones!"  She listens to the HE350 again later in the day (Dock of the Bay by The Persuations – A Cappella Dreams) and says "This is a really good sounding headphone!  Only $99? (smiles)"



It’s all about the ply!™


The BAP helps to bring out the bass just a tad, but was still a little bright to my tastes.  That’s when @Netforce brings out paper towels (looks like the Bounty brand) and proceeds to stuff them in the earcups of the HE350.


@Netforce installing Bounty paper towel



Here’s a video of @Netforce explaining the modification of my HE350:


The impressions regarding the paper towels are based on the use of specifically the BAP.


@Netforce originally used 4 ply (Bounty paper towel folded twice) and placed in the earcups.  Treble subsided, bass improved, but may have had an overall less clear sound as a result.


Then I suggested only using one ply (Bounty paper towel, not folded) and placed in the earcups.  My favorite sound of the different combinations.  Bass improved but wasn’t muddied, treble subsided just enough to not sound too bright, and depending upon source, can emit acceptable levels of bass as well.


@warrenpchi suggested a perforation of the paper towel, where there is around an inch diameter of paper towel from the earpads and a perforated hole in the middle of the paper towel, to allow the unobstructed sound of the HE350 to emit.  I found it still tonally a little bright because there wasn’t as much material to modify the overall sound, but is a painless modification that may be preferred to your ears.


@warrenpchi listening with focus - left/top, and his perforated mod, implemented by @Netforce - right/down



To summarize in alphabetical order:


@moedawg140 mod: BAP and 1 ply Bounty/material

@Netforce mod: BAP and 4 ply Bounty/material

@warrenpchi mod: perforated/hole in middle material


Here’s @Netforce’s impressions (verbatim):


“$99 open back dynamic from hifiman and massdrop? Personally as a big hifiman planar guy hearing this dynamic open back was in my opinion nice. For the price and the clarity it is nice contender for probably the best value can at $99. As it is stock pads and through my fiio x5 my first desire like with a lot of my headphones was to try it with an amp so I hooked it up with my Topping X1 amp and we got a nice improvement to the bass. Treble I found in a bit bright.


After listening to it stock and passing it around so others could listen to it I decided to take my angled brainwavz pads and put them on the headphones and holy moly we got an improvement to the bass! For the treble I did some experiments with some paper towels and tried adding some to tame the treble, initially 4 pieces was a touch too veiled, 1 piece seemed like it was what most people preferred! Did a little quarter size hole mod and that wasn't as well received. So overall with like most hifiman cans modding was a lot of fun and simple!”


Here's @Gilly87's impressions (verbatim):


"Stock, I'd say they are not a bad buy at $99 - reminded me of a less detailed version of my Beyer T90s with stock pads with mediocre extension. I could see some folks liking it, and it's not a bad buy at $99.
Now, @moedawg140 , @Netforce , and a few other guys at the show were working on a mod using different pads and putting different materials between the driver and ear, and I have to say, I was pretty impressed by the outcome - they sounded like the best warm, bassy headphones I'd ever heard under $200-$300 USD. If Hifiman could replicate the effect and make it look classy, they'd have a headphone that could easily convert the Beats crowd towards more upmarket stuff. Really nice.
If you like to tinker with pads and mods, these could be a dream come true, and either way they're a bargain at $99 for sure."


Remember the person who listened to the HE350 stock saying that there were issues in the treble? After the BAP and material mod, he exudes "This sounds like a completely different headphone now!  I like it!"


I would suggest, if you like the feel of pleather and angled-type pads, to give the BAP a try.  Even if you don’t purchase 3rd party pads, you can for very cheap or free use paper, a paper towel, shelf liner - anything permeable, to dial in the best sound to your ears.



Cultivate a fresh sound


What does this mean?  Too often we focus on only the music we are accustomed to.  I am usually this way as well.  Here’s an opportunity to listen to something you either may not normally listen to, or haven’t heard of.  As I publish reviews in the future, I will have new and older tracks from various genres that I’ve listened to in this section, and will be largely based on what songs really moved me in particular to the reviewed product I’ve listened to on it.  Even though the tracks will be linked to YouTube videos or audio-only versions, the tracks will either be listened solely from the iPhone 6 and TIDAL HiFi - Lossless, or from my Microsoft Surface Book and TIDAL HiFi - Lossless.  Instead of describing each track in immense detail, you can simply listen for yourself and bask in the beautiful music you may have just found for the first time right now!  What’s also great is that you can come back here just to listen to the tracks mentioned!  If you have any personal issues with any tracks posted, please PM me and I'll replace it with another track.  It's all about positivity in our musical journey.  With those kind words of encouragement, here we go…


Can't Stop The Feeling by Justin Timberlake


Sunshine by Eric Benet


Beethoven's 5 Secrets - OneRepublic (Cello/Orchestral Cover) by ThePianoGuys


Easy Lover (Phil Collins & Philip Bailey Cover) by Panama Wedding & Great Good Fine Ok 



Is the HE350 worth it?


In one word, yes!  You get exemplary sound and presentation of space for not a lot of vittles, money, dinero, moolah, mazuma, whatever you want to call it - that are needed to be exchanged.  The HE350 offers amazing fit and feel of a headphone regardless of the price point, and a headphone that I personally feel many people are going to enjoy, especially when they listen to the headphone for a while and enjoy the unique sound it produces to the senses.



Final thoughts


Masssdrop and HIFIMAN have been able to accomplish the unthinkable, which is to create a headphone that checks all of the auditory and practical boxes: fit, sound, and that slick aesthetic flair this headphone manages to exude.  After thoroughly listening to and enjoying the HE350, I would agree that it should be recommended as one of, it not, the entry-level audiophile headphone.  With that said, if you want an energetic headphone that offers remarkable clarity, soundstage that is immense in diligence and a fit with feel that is above its weight in gold, the Massdrop x HIFIMAN HE350 should be a part of your personal collection.





  • Massdrop x HIFIMAN
  • Driver: 50 mm dynamic
  • Impedance: 50 ohm
  • Sensitivity: 93 dB at 1 mW
  • Frequency response: 15 Hz – 22 kHz
  • Velour ear pads
  • Detachable cable
  • Cable length: 53 in (135 cm)
  • Cup connectors: 0.1 in (2.5 mm)
  • Plug: ⅛ in (3.5 mm)
  • Weight, with cable: 12.1 oz (343 g)
  • Weight, without cable: 10.6 oz (301 g)


Have you had a chance to hear the AKG 701/702 compared to these? Many of us coming from massdrop and the entry level audiophile community seem to use those are a reference and, I would like to know how these compare.
Thanks for the outstanding review. I am on the fence between the HE-350's and the T50RP MKIII. I primarily listen through my IPad and Galaxy S5 using the extreme setting on Spotify. I have heard concerns over driving the Fostex without an amp. Can you confirm you were not using an amp with your IPhone 6? Any preference between these two headphones?
The fostex is a planar driver and the HE-350's are not... if that matters to you
Wow, very good review. Did you try pad rolling, specifically with any of the focus ear pads? Also, a lot of people like to use percentages of sound quality as comparison to "top-of-the-line" stuff. Just for fun (using this in substitute for kicks-and-s**ts or s**ts-and-grins), what percentage of sound quality would the HE-350 would be in comparison to the HE-1000? If you have any DAC-amp more powerful than the Questyle Audio QP1R, it would be preferred, but not necessary.
@DARKreaction - I haven't listened to those back to back. Feel free to PM me to send one my way so I can add that headphone or any other one you want to the review. 
@nwiniewicz -  The review does not currently state that an amp was used. If I did and wrote impressions about it, the amp would be disclosed under "Sources" or "DAC/Amp(s)" used.  I haven't heard that specific Fostex back to back with the HE350.  
@pbui44 - Thanks for the comments.  Make sure to PM and send any type of pads (including focus pads) you want me to compare. Thanks in advance, and if not, no worries.  
I am not sure about "a lot of people", but I personally do not normally use percentages of sound quality as comparison with any piece of audio equipment, including "top-of-the-line stuff".  However, if I was to look at both headphone's prices to determine a percentage of sound quality the HE350 exhibits compared to the HE1000, I would say the HE350 is more than 1/30th the full 100 percentage of sound quality of the HE1000. :). Other than that it really comes down to your own personal preference and if you feel the HE350 is worth the $99 asking price.  
I use the MIcro iCAN SE and even though it is very powerful at up to 4000mw, you don't need anything near that amount of power to drive the HE350 to ear blistering levels. A smartphone such as the iPhone 6 sufficiently drives the HE350 to very loud levels when the volume is turned up.  
The QP1R isn't solely a DAC/amp, it is a DAP - a DAP that drives most all headphones with a very ample amount of power, without the need to stack an external DAC/amp to it.
@moedawg140 Hey thanks for the review. Maybe I missed it, but could you elaborate on how open they are? (a.k.a. how much am I going to annoy my coworkers if I buy it)
Thanks :-)
@Xaelias - Hope you enjoyed the read. Open-back designed headphones usually leak a lot of sound - no difference with the HE350. I added my thoughts about the sound leakage of the HE350 under "Sound impressions".
Thanks moe, I think I might just have to get one. I am jealous you got yours first though. LOL
How's this compare with the Sennheiser HD598? You mentioned the soundstage on these are unrivaled at this price point, but the HD598 are renowned for their soundstage and can be had for less than $100 (especially on Black Friday)
@shiorisekine - Andre, this would be a great complimentary headphone to the HIFIMANs you currently own, in my opinion.
You know you can meet up with me anytime, so it's all good, my friend! :)
+1 on how the HE350 compares to the HD598, especially in regards to bass.
How does the HE350 sound with the iCAN micro SE bass boost 1 and 3?
Hi could you please compare these with the Sennheiser hd 598 and AKG k553? 
I'm a beginner audiophile and professional pianist and wish to purchase a new headphone on a budget. 
My main requirements are detailed sound and neutral sound along with a decent Soundstage mainly for instrument separation purposes like those in orchestral music or layering of synths in Trance music. Don't mind open /closed back as long as the first two criterion get fulfilled. 
Thanks a lot! :)
Thanks for posting review, and so glad to see this particular sound signature. Seems may be down a step from AKG-K701-702-7xx-702.65-712Pro-Q701, but with similar type sound. Grabbing a set just for curiousity & low price.
It appears the sound signature is nearly opposite of the HE-300 dynamic. I have one of the latest production 300 and could hardly listen to them right out of the box, thinking who would release a headphone sounding like this. Burn-in didn't help. It had nearly no high frequency - severely attenuated highs. All else was good & acceptable, but without treblees it was very overly dark. What many of us did was the HE-300 head-fi mod (shown on head-fi threads)  to remove the thick felt piece in each cup. Dramatically about face change in the sound - the high frequencies were now all there & alive, and headphone is completely different, sounding good. I thought the modded sound should've been the factory sound out of the box, and was just due to the felt.
Looks like the new HE-350 different dynamic driver and internals have addressed this to make a very good sound right out of the box and a great value. Eager & curious to hear these; will be my 4th HiFiMan in collection - HE-560, HE-400'i', HE-300 and HE-350.
@luvmusik - thanks for the kind words, appreciate it.  Since you are purchasing a HE350, I'd like to in the future, read your thoughts of it compared to the 3 other HIFIMANs you own - hopefully you'll enjoy the HE350.
@moedawg140 What a great review. Thank you so much for sharing. Have you also had a chance to try Philips SHP9500? I asked several people how it compares with HE350 and has not received any answer. :(
@Decommo - Thanks for the comments - glad you enjoyed the review.  I have not had the chance to try the Philips SHP9500, but I read in your profile that you own a SHP9500.  Even though its modded, you can send it in to me and I'll add it to the review.  Even though the sound may not be the exact same as the unmodded version, at least you'll have an exact comparison to your own SHP9500!  PM me if you would like to send it, but if not, no worries. 
Compare these to the HD600?
@smy1 - Not right now.  What I will say, is that the HE350 reminds me somewhat of the HD 800. Calling it a "Baby HD 800" wouldn't make me flinch. 
Would you say these would be a good buy for a pair of gaming headphones for sound position accuracy?
Head-Fi.org › Head Gear › Headphones › Over-Ear › Massdrop x HIFIMAN HE350 › Reviews › moedawg140's Review