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Etymotic ER4SR review

Flat as hell, in a good way.

Published onJanuary 27, 2017

The bottom line
If you're not into accuracy, it's hard to recommend these. That said, these are easily my new favorite pair of in-ears. If you want to hear your music with little embellishment, these live up to the Etymotic legacy.

If you're not into accuracy, it's hard to recommend these. That said, these are easily my new favorite pair of in-ears. If you want to hear your music with little embellishment, these live up to the Etymotic legacy.
Product release date

Jun 2016




0.4 x 1.2 x 0.4 inches


13.1 ounces

Model Number


What we like
Flat sound
Removable cable
Plenty of ear tip options for best fit
What we don't like
Sound isn't for everyone
Not cheap
SoundGuys Rating
User Rating
Rating Metric
Our Rating
User Rating
Durability / Build Quality

UPDATE [March 2022]: While it’s been out for five years, we still consider the Etymonic ER4SR to be one of the best earbuds currently on the market.

Etymotic Research might not be a brand you’ll find at your local Best Buy, but its name carries weight in the audio community. More than the likes of Beats and Bose. The company has been making some of the most accurate earphones for decades. The ER4SR, aims to provide that same accurate sound that so many people love. With the words “studio reference” (SR) in the name, how do they sound? More importantly, who are they for and should you buy them?

What does the Etymotic ER4SR include?

Photo of the Etymotic ER4SR packaging all laid out against a white table.
You get a few extra ear tip options, an earbud nozzle brush, and carrying case with the studio earbuds.

You get the headphones, nice hardshell carrying case, the user manual, cable clip, filter removal tools and extra filters, and six extra pairs of ear tips (some foam and some triple flange). You’ll also get a certificate of performance that gives you all kinds of information about your headphones including frequency graphs, total harmonic distortion, and sensitivity.

How are the earbuds built?

An image of the Eymotic ER4SR in-ears on a white surface next to a bookmark and watch.
The Eymotic ER4SR boast a neutral-leaning sound signature, which is great for all genres of music.

These are true in-ears, so if you don’t like putting things in your ears these might not be for you. But if you can get past that you’ll get some really good noise isolation, and that’s especially true with the ER4SR. The slim housing lets you wear these comfortably so you can aim sound straight down your ear canal and with the right ear tips, you won’t hear much outside noise when playing music.

The housings are made of a smooth aluminum, so they’re durable enough to be tossed in your pocket without getting beat up. It includes a hardshell carrying case, so you can keep your investment protected. The aluminum build is also super handy when removing filters or cleaning the stem, as it’s less likely to break when compared to the plastic of the previous version. From here to the tips the earphones have a thin braided cable that doesn’t feel quite as durable, but definitely looks nice and held up to the stress of everyday use.

An image of the Eymotic ER4SR in-ears on a white surface.
These in-ears may be uncomfortable for some who are accustomed to headphones.

You can also replace the cable if it ever gets broken or worn down thanks to new MMCX connectors. Wearing these will take some getting used to if you’re not used to IEM’s because they do get pretty deep, but once you get it right they’re actually very light and comfortable. You can wear them either over or under the ear depending on what’s more comfortable for you. Both work fine but I find that wearing them over the ear makes them feel more secure.


An image of the Eymotic ER4SR in-ears disconnected from the cable.
The Eymotic ER4SR’s removable cable means these are easy to fix if something goes awry.

These connect to your devices via a 3.5mm jack, but they also come with a ¼” adapter if you need to plug into higher end audio equipment. As previously mentioned, the ‘buds can pop off via MMCX connectors and you can purchase another cable from the website.

Sound quality

At first listen these sound, for lack of a better way to say it, boring. But after really listening for a while you begin to really appreciate this brand of netural and I ended up really enjoying these.

An image of the Eymotic ER4SR in-ears in a case.
The earbuds are compact and can be taken on-the-go.


The SR in the name stands for studio reference, which means these sound about as flat as it gets. It’s definitely a particular kind of sound and while I personally love it (hence the sound quality score), your mileage may vary. Bass kicks in “L.E.S” by Childish Gambino are there, but that’s about as much as you can say about them. There’s no real oomph, which to be fair isn’t the point of accurate headphones.


Vocals are also nicely blended in with the instruments in the mid-range, but there is a very slight bump just to give them a little extra push. But just like the bass, these sound pretty flat. Great for my kind of work, but if you’re just listening casually these might not do it for you.


Unlike other headphones I’ve reviewed, these don’t claim to go up to 20kHz. Instead they drop off at about 16-17kHz and you can tell. Cymbals and hi-hats sound nice and detailed, without ever becoming harsh. I personally found these great for listening to Jazz. The brushes in “Festive Minor” by Chet Baker have a beautiful amount of detail. You can hear the bristles hitting the snare drum if you listen closely enough.

Should you buy the Etymotic ER4SR?

If you listen to bass-heavy music these are going to let you down for sure. That said, I found that the accuracy and detail were perfect for jazz. I’ve been to a good amount of live shows and these make it sound like you’re sitting front and center. However, when it comes down to it these are not for everyone.

Though I prefer a flat sound, I’m aware that I’m in the minority which is what makes these hard to recommend for normal consumers. You’re going to want a pair of reference headphones like these mainly when it comes to audio production or mixing (or if you’re just curious to hear your favorite songs with very little embellishment).

In other words, if you want professional-level accuracy these are great. I used these to make my last video and it turned out to be my favorite video that I’ve done in terms of how the audio came out. That said these aren’t what I’d call “cheap”. Still, at $349 they’re not nearly as expensive as some other IEM’s out there. If you’re ready to take your audio game up to the next level Etymotic is again in the conversation of “best IEM’s” with the ER4SR.