The Audio-Technica ATH-M50 series are widely regarded as some of the best deals in headphones, offering pro quality monitoring for less than a pair of many more consumer-focused headphones would cost. Even so, some people find the price to be a little steep, and Audio-Technica is all about pleasing its customers, so they offer cheaper options as well.

The ATH-M40x sell for just $99 USD, and many people say they sound almost or just as good as their more expensive relatives. So, of course, we had to check them out ourselves and see if this was true.

Editor’s note: this Audio-Technica ATH-M40x review was updated on March 19, 2021, to add context to the sound quality section.

How’s the build quality of the Audio-Technica ATH-M40x?

Best headphones under $100: The headphones flat on the chest while being worn around the neck. There is a thumbs up on the right side of the image.

Though the ATH-M40x aren’t the pinnacle of portability, they fold flat to make space in a bag or to rest comfortably on the chest.

In stepping down the price from the ATH-M50x, Audio-Technica had to cut corners somewhere for the ATH-M40x, and one of these is variety. While you can get the ATH-M50x in a few different color options, there is only one available here. The headphones have a matte black finish with silvery gray highlights for the Audio-Technica logo.

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As mentioned above, this is a seriously large pair of headphones—after all, you’ve got to put those 40 mm drivers somewhere. This could potentially be a problem as far as comfort is concerned, but luckily that isn’t the case. After wearing these for so long during testing, it’s clear that the ATH-M40x were designed with long sessions in mind. I didn’t start to feel the fatigue so common in larger headphones, and even in warmer weather, I didn’t notice the ear cups starting to heat up. Even though the headband isn’t very heavily padded, this didn’t seem to be an issue when it came to comfort.

The ear cups rotate very freely, and though this can lead to easy points of failure in the build, the ATH-M40x feel like a very sturdy pair of headphones. Unfortunate though it may be, we can’t subject our review units to heavy stress testing, but this feels like a tough pair of headphones. Normally we’d be a little concerned about only having a pouch to carry the headphones, with this build quality and with the price being so low, we’ll give these a break.

Does Audio-Technica provide any accessories?

Best headphones under $100: Audio-Technica ATH-M40x on Audio-Technica record player

Audio-Technica’s ATH-M40x may receive a lesser model number than the M50x, but that doesn’t mean they’re a lesser headphone.

Like their older brother, the ATH-M50x, the Audio-Technica ATH-M40x are not a small pair of headphones, and your first clue will be the sheer size of the box here. We’ve seen some pretty big Bluetooth speakers come in smaller boxes.

Open it up and the first thing you’ll see is a piece of cardboard that sits on top of the headphones. This holds the carrying pouch as well as the manual and warranty information. Underneath you’ll find the headphones themselves, wrapped around a cardboard “post” of sorts. Take this out of the box and you’ll find it was covering the two included 3.5 mm audio cables. Here you’ll also find a small pamphlet on the locking connectors used on these cables. More on that later.

How do you connect the Audio-Technica ATH-M40x?

Best headphones under $100: Audio-Technica ATH-M40x on Audio-Technica record player

Though the headband doesn’t look plush, it’s comfortable and the architecture of it disperses weight appropriately.

As the ATH-M40x are built with monitoring in mind, you’re not going to find Bluetooth connectivity, or even a mic and remote. This is a pair of headphones built with one and only one thing in mind: listening to music. That said, Audio-Technica has provided a few options as to how exactly to do it.

Normally when you see two cables included with a pair of headphones, it means one standard cable and one with a remote. In this case, Audio-Technica has taken a decidedly old-school approach. You do indeed get the standard straight cable, but you also get a coiled cable which, personally, I love. This comes in handy for another reason.

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While the cables are 3.5 mm on the ends, the ATH-M40x use a proprietary locking connector on the headphone end. While this is handy because it keeps the cable from ripping out if you trip over the cable, it also makes replacing a snagged cable tough. Luckily, the coiled cable has some “give,” making this less likely to happen.

The sound quality is very good

Best headphones under $100: Audio-Technica ATH-M40x on Audio-Technica record player

The Audio-Technica ATH-M40x cable uses a locking mechanism to keep the cable in place.

One of the biggest differences between the ATH-M40x and the more expensive ATH-M50x is the driver size. The drivers here are 40 mm in size, just slightly smaller than the 45 mm drivers in the M50x. While this doesn’t sound like a huge difference, it does affect the sonic signature.

In testing the ATH-M40x, the main thing we wanted to test was fidelity, so I listened to CDs and lossless audio files played from a computer through a Focusrite Saffire Pro 40 audio interface. To see if the headphones played nicely with mobile devices (which they do), I also did some listening on a Moto X. During testing a listened to a wide variety of music from multiple genres and eras.

Lows, mids, and highs

The one area where the smaller driver size makes the biggest difference is definitely the bass, but that doesn’t mean that the bass is weak here, just that it isn’t as emphasized as the M50x. Listening to Grant Green’s song Iron City, it feels like the bass should be shaking the room. The midrange is the frequency range where a lot of important audio elements live—vocals, guitars—so this is especially important in studio monitor headphones, and the ATH-M40x get it right. Midrange is clear and accurate, with excellent low-mid depth. The ATH-M40x do a great job of reproducing clear highs.

The frequency response is accurate, making this a great headset for budding audio engineers.

Mixes that make good use of stereo space will sound excellent on these headphones. The ATH-M40x trade a tight seal for comfort, so while you’ll be happy listening to your tunes, anyone nearby will definitely get at least a hint as to what you’re listening to.

Should you buy the Audio-Technica ATH-M40x today?

Beyerdynamic DT 240 PRO headphones cable removable on-ear over-ear comfort audio-technica ATH-m40X studio commuter

For studio headphones, the Pro are much smaller than the ATH-M40x.

Obviously, the ATH-M40x aren’t quite as good as the M50x—if that was the case, Audio-Technica wouldn’t sell both products. That said, it is impressive how close these do get, and stepping outside of the shadow of their bigger brother, this is a great pair of headphones. Long story short: if you’re looking for a great pair of headphones for monitoring or just for listening to music and you don’t want to drop a bunch of cash, these are a great buy. At $99 USD, the Audio-Technica ATH-M40x are an amazing deal.

If you want a similar headset with a boom microphone, give the Audio-Technica ATH-G1 a chance; this is a gaming headset but you can use it to listen to music too.

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Audio-Technica ATH-M40x