Earsonics S-EM9

The power of 9.

PROS: compact universal design, isolation, natural revealing tonality, expanded soundstage.

CONS: short nozzle, needs a set of regular single flange eartips.

The product was provided to me free of charge for the review purpose in exchange for my honest opinion.

Manufacturer website: Earsonics, available on Sale from Amazon and directly from Musicteck.


Sometimes I wonder why majority of IEM manufacturers are either from US or Asia, while many well known full size headphone companies are from EU.  I can’t imagine the demand for either one being different depending on the geographic location or cultural differences, and perhaps there is some logical explanation to this phenomenon though I haven’t discovered one yet.  So when opportunity knocked on my door, or actually landed in my Inbox, to review another “rare” European IEM manufacturer (Earsonics from France), I accepted it with a wide open arms of curiosity and was greeted with a pleasant surprise when S-EM9 showed up at my doorsteps.

It all started when Frank Lopez, a musician and a producer, took his sound engineering passion to the next level and founded Earsonics.  But it wasn’t until 2011 when they released their first flagship SM3 model which put them on the map.  In the following 4 years Earsonics product line grew with Classic, Custom, Signature, and Music series, including their S-EM9 flagship introduced a year ago.  Just recently their Music line got expanded further with two new ES2 and ES3 models, but these are more on a budget side with a scaled down performance while S-EM9 still remains their top flagship which I would like to share with you about in my review.


As many of you know, I pay close attention to unboxing experience because I enjoy surprises.  After all, unboxing is like a box of chocolates, you never know what awaits you inside.  And speaking of a box of chocolates, that’s exactly how it felt holding S-EM9 in a medium size flat rectangular box with a large bold image of IEMs that looked like they were going to pop out of the cover sleeve.  The image looked delicious and even the shell of S-EM9 under the light had a dark chocolate shade of color.

With a sleeve off, you are looking at the main product box with a soft to the touch cardboard cover and ES logo printed on the top of it.  When the cover is lifted, you get a “Merci” greeting card and the presentation of the top layer with a cutout for a carrying case and S-EM9 shells.  Another foam cover layer off, and now you can see the “candies” in their full glory.  There is nothing revolutionary about the packaging, but still it was a nice arrangement showing how much pride Earsonics took to present their product in the best spotlight.  Every accessory piece, including IEMs itself, was sitting in their own individual cutout pocket, preventing them from shifting around inside of the box and ensuring a secure delivery of the product to the customer.


The accessories include a slim rectangular carrying case, not a generic type but uniquely shaped and large enough to transport S-EM9 even with an aftermarket cable.  The case is a little shallow, so I would suggest wrapping the cable neatly before stuffing your IEMs inside to prevent the extra pressure on the nozzle w/eartips.  Inside the case there was a sealed pack of what I assume to be disinfecting wipes.  The only other time I’ve seen wipes being a part of the accessories was with another EU manufacturer I recently reviewed.  Is this a coincidence?  Perhaps not and maybe it goes along with a “conspiracy” why EU headphone market is leaning more toward full size cans where you don’t need to stick anything deep in your ear canal, but when you do – better disinfect it!

Next, you have 1/4” adapter which I usually consider a filler accessory for IEMs, but perhaps the message here is that S-EM9 intended for use with both portable DAPs and mixing studio consoles.  The cleaning tool was also included and definitely a necessity considering nozzle has 3 separate open bores which require periodic cleaning.  One interesting observation, the cleaning tool had a little magnet on the side so you can attach it to a metal surface when not in use.  I have seen other cleaning tools with a built in magnet, but this one looked a little different.  I’m a sucker for unique accessories.

Last, but not least, are the eartips.  My opinion about eartips is obviously very subjective because it depends on a personal ear anatomy.  You do get 2 pairs of double flange silicone tips in what appears to be S/M size (and one extra gray set was already included on IEM).  You also get 2 pairs of genuine Comply standard tips in M/L sizes.  And then you get a set of funky looking single flange silicone “umbrella” tips.  Could be just my ears with a wide earcanal opening, though I have seen similar comments from others, but I wish Earsonics would have included S/M/L set of regular standard single flange eartips because none of the included ones worked for me.

Without a proper seal, even the best tuned IEM will sound awful if you don’t have the right eartips selection.  The nozzle of S-EM9, and other Earsonics universal IEMs is not very wide, most likely T200 size, which is not the most common replacement eartip size.  Even when you find the replacement, the nozzle is also shorter in size and some people might require a longer eartip stem to extend it.  This probably explains why Earsonics choose to include double flange tips because they seal and extend the nozzle if your ear anatomy can accommodate it.  Since it didn’t work for me, I ended up with my own mod by finding a pair of old foam eartips where I removed the plastic core to use as an adaptor and another pair of silicone eartips with a wider bore opening to fit it.

This mod extended the nozzle by 1-2mm, and I experienced one of the best isolations from universal pair of IEMs, though it was mostly due to a large cap of the eartip which formed a perfect seal with my ear canal.  Obviously, for many this is not going to be a showstopper, but just keep in mind that you might have to spend a little bit of time with eartip rolling to find the right pair.  Furthermore, I think there is a light at the end of this tunnel since Earsonics sent me a separate pair of regular single flange tips which had a perfect fit.  I really hope they can make these tips to be a permanent set of their accessories.

Eartips mod.


Typical of many IEMs/CIEMs, even of a flagship status, don’t expect to find any fancy after market cables here.  The included one is a standard OFC wire with 3.5mm TRS headphone connector in a rubbery compact housing with a decent strain relief, a plastic y-splitter mold with a good strain relief on every side, and a sliding clear plastic tube piece used as a chin-slider.  The pairs of wires from each earpiece get combined at y-splitter where the ground becomes common with 3-wires going down to the connector.  Going up to the earpieces, you have a standard 2pin connector with a plastic housing and a shape compatible with surface mounted and recessed sockets, red/blue dots indicating corresponding Right/Left sides, and a flexible memory wire wrapped in a clear plastic tube forming a comfortable adjustable earhook.  I didn’t notice any microphonics using stock cable with S-EM9.

In my opinion the stock S-EM9 cable doesn’t do it justice, and to realize the full potential of S-EM9 tuning you need to play around with different cables.  I know that some people are not cable believers, but with a careful level matching and going back’n’forth between the stock cable and a handful of aftermarket replacements, I found some interesting results based on how I hear the change.

Stock OFC vs Linum BaX (Litz SPC) – I hardly hear any changes in sound, just a very slight bump in mid-bass.

Stock OFC vs Plussound X series tri-metal (blend of copper, silver, and small amount of gold) – sound is a little more balanced, with more sub-bass rumble and a little stronger mid-bass punch, upper mids are becoming more revealing, and I hear more sparkle in treble.

Stock OFC vs Whiplash TWau Reference (gold plated pure silver) – sound is more balanced, the bass is tighter and more articulate, more textured sub-bass rumble and a faster mid-bass punch, mids are more revealing and detailed, more resolving with a better transparency, and treble has more sparkle and airiness.

Stock OFC vs Effect Audio Thor Silver II+ (pure silver) – sound is more balanced, the bass is tighter and more articulate, more textured sub-bass rumble and faster and tighter mid-bass punch, mids are more revealing and detailed, I hear sound having a higher resolution, more transparency, better layering; treble has more sparkle and more airiness.

Thor II+ vs TWau – TWau has a little stronger mid-bass while Thor II+ adds a little more sub-bass texture.  Thor II+ upper mids are a bit brighter, more revealing while TWau is a touch smoother.  Thor II+ has a little more sparkle in treble.

Both TWau and Thor II+ paired up great with S-EM9 and offered a noticeable sound quality refinement without a drastic change of the sound signature.  If you are on a budget, you can get a similar result with X series, but not the same level of refinement as the other two.  Given a choice, I would probably go for Thor II+ as having the best synergy with S-EM9, though TWau was right behind it.



Considering 9 driver design, thus S-EM9 model name, I was very surprised to find the size of the shell to be on par with many of my other 3 driver universal IEMs.  Earsonics definitely found a clever way to pack their 1x low, 4x mids, and 4x highs BA drivers into one super compact shell with 3-way asymmetrical sound channels to manage optimal phase alignment thanks to a custom cannula (thin sound tubes) profile.  The result of this coherent tuning speaks louder than words, and I will discuss it further in my Sound analysis section.

The shell is not just ergonomically shaped to fit comfortably inside of Concha Cavum of even smaller size ears, but it also has a rather low profile.  Don’t expect to be able to put your head comfortably on a pillow with your ear down, but at the same time the shell wasn’t sticking out too far either.  Exterior of the shell has ES white letters on the right faceplate and a white R next to the 2pin connector socket, and a red 9 on the left faceplate with a red L next to its 2pin connector socket.  Left shell also has a serial number etched on the inside of the shell.

I know it’s just an editorial nitpicking comment, and I completely understand that Red 9 is part of S-EM9 model logo, but every IEM/CIEM I have tested in the past had Red labeling (not artwork but labeling) on the Right side and blue or other colors on the Left side.  It’s impossible to mix up L/R sides because shells are not symmetrical and you have L/R letter marking on each shell.  But I have to admit that considering I switch daily between many different IEMs/CIEMs, on a few occasions I had to stop and think for a second while looking at Red 9 before putting it in my Left ear.  Not a showstopper, but just a force of habit in my case.

The nozzle has 3 bores corresponding to a three way grouping of 9 BA drivers, and it’s aligned with cannula tubes going to each nozzle.  Considering the quality of S-EM9 bass performance, I still can’t get over the fact they only allocated a single BA driver for lows, while other 8 drivers were split between quad mids and quad highs.  I already talked about the nozzle being a little too short and how I was able to mitigate that with my eartip mod.

The fit.


Page 2: Sound analysis, Comparison, Pair up, and Conclusion.

8 thoughts on “Earsonics S-EM9

  1. Hey there twister6 how would the s-em9 compare to the hifiman re2000 or campfire vega, I am trying to decide between all three and I listen to mostly hippop, vocals, rnb and soft rock


    1. Is your preference for better vocals or more emphasis in bass? Em9 is kind of outdated and I should be reviewing their Grace updated version soon. Also, hfm released RE2000 silver version which is $500 cheaper than gold and now they started black Friday sales with re2k silver going at 1/2 price already for only $799. Vega has too much bass, could be overwhelming, and I would consider their latest flagship Solaris instead. If you don’t want harder hitting bass, re2k silver is a good option with a finetuned sound of gold (a touch less bass and more natural vocals). Otherwise, Solaris is a killer iem.


    1. I haven’t listen to S-em9 in years, but soon will dust them off to refresh how they sound cause I will start working on Earsonics Grace review and will use it in comparison. Off the top of my head, something like Westone um pro 50 V2 will suite you well.

      Liked by 1 person

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