The world of true wireless earphones is tough to navigate, especially with the extreme popularity of Apple’s AirPods and AirPods Pro. There are so many options out there claiming to be “AirPods killers,” it can be tough to know one when you see one. Well, if ever an “AirPods killer” existed, it’s the Sony WF-1000XM4.

Let’s explore why that is.

Editor’s note: this review was updated on June 23, 2021 to include the video version of the review.

Who should buy the Sony WF-1000XM4?

A photo showing the Sony WF-1000XM4 in the charging case.

The charging case is finally a reasonable size, so don’t worry about pocket space for this one.

  • Deep-pocketed true wireless enthusiasts will find a trusty companion in these earphones
  • Wall street gym rats will not only be among the few to afford these, but the sweat resistance means they work
  • Those looking for the bleeding edge of audio tech are going to need to look at these, because they’re currently unique among their field

What’s it like to use the Sony WF-1000XM4?

The Sony WF-1000XM4 is one of the best true wireless earphones on the market, and the experience is as top-notch as it gets in this category. Noise attenuation, sound quality, and user experience are all top notch, as Sony has taken a keen interest in improving the things that could potentially make users’ lives better.

A photo of the Sony WF-1000XM4's case open, revealing the earphones sitting within.

The addition of the copper ANC mic housings make the Sony WF-1000XM4 a bit more glam.

Included in the recycled paper packaging of the Sony WF-1000XM4 is the charging case, three sizes of polyurethane foam ear tips, your earphones, and a charging cable. Assorted documentation will help guide you, as these are a smart product like any other and there’s a fair bit to go over to link your voice assistant and other integrations. Truth be told, setup is fairly simple, though you’ll want the Headphones Connect app from Sony to get the most out of your earphones. The app has all sorts of goodies baked in, like changing your control scheme, updating your virtual assistant, changing the sound of your earphones, and more.

Actually using the Sony WF-1000XM4 is pretty rewarding, given that the earbuds are much smaller than their predecessors, and consequently fit a lot better. Capacitive touch controls mean you won’t struggle to command your earbuds, and sweat resistance means you probably won’t kill these when you work out.

...you'll want the Headphones Connect app from Sony to get the most out of your earphones.

Under the hood, Sony’s V1 processor helps the Sony WF-1000XM4 use less energy for its main functions, so noise cancelling and hi-res playback won’t tank your battery life as much as in the past. The case is upgraded too, now able to charge wirelessly via Qi-compatible pads. Additionally, it’s also much smaller than the Sony WF-1000XM3‘s case. If you don’t have a wireless charging pad, you can hook the case up to just about any old USB-C charging apparatus.

Be sure to use the foam tips correctly

To get the best fit with the included foam tips, you’re going to have to fight the urge to just jam them in your ears. Take the time to roll the foam in your fingers first (until they halve in thickness), so that they’re easier to slip into your ears. Once inside, hold the earphones in place for about 20 seconds while the foam expands back outward to press against your ear canals. After this happens, you should have a near-ideal fit that you can check with the Headphones Connect app’s fit test. if you need larger or smaller ear tips, the app will tell you!

A photo showing the memory foam tips of the Sony WF-1000XM4.

The polyurethane foam ear tips of the Sony WF-1000XM4 make for an easy fit every time.

Open Headphones Connect, and connect to your earbuds in the app. The next screen will offer you several options to better use your earphones, and you can then navigate to the ear tip fit test from the “System” tab. The test will guide you through proper fit and a test sweep to verify that the function is working properly, then you’re good to go.

How do you control the Sony WF-1000XM4?

A photo showing someone using the touch controls of the Sony WF-1000XM4.

The capacitive touch controls are straightforward, but somewhat customizable.

After you pop in the earphones of the Sony WF-1000XM4, there are a number of touch controls that allow you to keep that phone in your pocket. You can find a brief rundown below.

 Left budRight bud
One tapMute/ANC/Ambient soundPlay/Pause
Two tapsN/ATrack forward/answer call
Three tapsN/ATrack backward
Long pressN/ASmart assistant

Taking an earbud out of your ear will automatically pause your music. Additionally, you can hold a finger to your earbud to activate Sony’s passthrough feature.

How do you pair the Sony WF-1000XM4?

Without a pairing button on the case, pairing the Sony WF-1000XM4 can be a little tough to figure out on your own, but the process is pretty simple. You only need to set this up the first time you pair to a device, so don’t worry.

Remove the buds from the case, and put them in your ears. Hold your fingers to both buds for 6 seconds, and the pairing mode will start—you’ll hear a synthetic voice tell you that your Sony WF-1000XM4 is in Bluetooth pairing mode. Ensure that your source is looking for a device to connect to, and you can select the Sony WF-1000XM4 from a list of available devices.

Every time you need to pair your buds afterward, you can just take them out of the case and they’ll try to connect to a device they’ve connected to before. For most, that’ll just be your smartphone.

How does the Sony WF-1000XM4 connect to your phone?

Unlike most earphones, the Sony WF-1000XM4 can connect to your phone using Bluetooth 5.2, which may sound a little boring—I assure you, it’s not. If you have a smartphone with a processor that supports this version of Bluetooth, you should see improved battery life, and it’s also conceivable that these earphones will support all mandatory codecs in the 5.2 stack, including LE audio. We asked Sony about this, but are currently waiting for a response.

A photo showing the Sony WF-1000XM4 in its case, with the lid open.

Pairing the earphones is easy after the first time.

Like the Sony WH-1000XM4, the Sony WF-1000XM4 can use the SBC, AAC, and LDAC codecs. If you want the high-bitrate flavor of LDAC, you will have to enable developer options in your settings panel on Android. Scroll down to “Bluetooth Audio LDAC codec Selection: Playback quality” and pick among the list there. We believe your best results will be had with 660kbps, but your results may vary.

Is the Sony WF-1000XM4 waterproof?

A photo of the Sony WF-1000XM4 on a wet, red bench, also with moisture on the earphones.

An IPX4 rating means splashes, sweat, and humidity won’t kill your earphones.

The Sony WF-1000XM4 is not waterproof, but it does have an IPX4 rating against moisture. That means these earphones will be quite at home in the gym—not the pool—if you decide to use them there. A word of caution though: do the fit test before cardio, because you don’t want an insecure fit when you’re about to really go hard.

Is the Sony WF-1000XM4 better for the environment?

As much as I’d like to tell you that the Sony WF-1000XM4’s recycled paper packaging and reduced plastic is a game changer for the environment, it’s a small gesture. The fact remains that all true wireless earphones are ecological nightmares, no matter how eco-conscious the packaging is. Tiny batteries that lose their utility in a short period of time because of the charge cycles are still a big problem here, and I doubt we’ll see any TWS products really solve this any time soon.

Reducing the plastics used in the packaging by quite a lot is a great step, and one I hope to see more often. But let’s not kid ourselves on the battery issue: all true wireless earphones are bad for the environment, and it’s because their design is inherently flawed as a category.

...let's not kid ourselves: all true wireless earphones are bad for the environment, and it's because their design is inherently flawed as a category.

To its credit, that V1 processor that the Sony WF-1000XM4 uses appears to do a great job at getting more performance out of the earphones with less power, and that’s a welcome thing for anyone using true wireless earphones. The longer you can go without charging them, the longer the batteries in each earbud will last—and the longer the batteries last, the fewer times you’ll be tempted to throw out your earphones for a new model, reducing overall waste.

How does the Sony WF-1000XM4 sound?

The Sony WF-1000XM4 sounds right about what it should for its price point, though there are some quirks that you might need to tinker a bit with in order to get the sound you want. In general, the foam ear tips guaranteeing a good seal means that not only are you able to prevent a lot of outside noise affecting your tunes, but it’s easier to get the best performance possible.

A chart showing the frequency response of the Sony WF-1000XM4 true wireless earphones compared to the SoundGuys house curve.

Boosting bass and cutting highs, you’re going to want to tinker a bit with the Headphones Connect app a bit to find your best sound.

If you decide to keep the default equalization (or don’t want to install the app), your music will sound pretty much like it’s supposed to, minus the fact that there’s a bit of an aggressive bass bump relative to the rest of your music. This is a very consumer-oriented sound, and it shows with the low end emphasis. That’s not a bad thing though, and it’s often something in-ear manufacturers do when they expect their product will need to drown out low-end noise from people wearing their buds into noisy situations.

In general, we found that the Sony WF-1000XM4 gives most notes all the way up to middle-C a good bump, while cutting the higher notes and harmonics after 2kHz a bit. What does that mean for you? Mostly, just that you should try fiddling with lowering the bass and mids in the equalizer of the Headphones Connect app a bit. If you leave your earphones un-tinkered-with, you might find that you lose a few details, and things like guitar attack or super high notes sound about half as loud as they should. Of course, you can change that by equalizing, so it’s not as big of a deal as it sounds. It’s also possible your head will be a bit different than ours, so we publish our data so you can make an informed comparison to other models.

A chart showing the error curve of the Sony WF-1000XM4 response minus the SoundGuys house curve for consumer headphones.

Looking at the above chart another way, the Sony WF-1000XM4 has a relative under-emphasis in the highs, and a robust bass/low-mid emphasis.

This kind of sound is really good for older recordings that tend to under-emphasize bass, and vocal-heavy mixes. However, you may note that higher-pitched voices sound a tiny bit off, like in Fleetwood Mac’s Dreams. In this track, Stevie Nicks’ voice sounds a little “hollow” compared to what it might sound like over a stereo system, some of the hi-hats are almost muted, and cymbal crashes sound a bit quiet.

Speaking of older music, the Sony WF-1000XM4 also brings the latest version of Sony’s digital sound enhancement engine (DSEE) to market, called DSEE Extreme. While upsampling music generally doesn’t have the Earth-shattering results promised by manufacturers, this feature is good to have in your back pocket if you listen to a lot of lossy files on your phone. Otherwise, you’ll not notice much of a benefit with higher-bitrate tracks because it doesn’t need to upsample those files.

Do the Sony WF-1000XM4 earphones support spatial audio?

If you’re hoping to take advantage of spatial audio in music, the Sony WF-1000XM4 supports Sony’s proprietary 360 Reality Audio, which is supported on the Tidal, Deezer, and Amazon Music HD streaming services.

How good is the Sony WF-1000XM4 at canceling noise?

The Sony WF-1000XM4 does an excellent job quieting the world around you. Not only are these earbuds great with active noise cancellation (ANC), but the memory foam tips seal to oddly shaped ear canals extremely well, meaning they offer quite a bit of isolation, too. Good isolation also grants you a better chance at blocking out incidental noise like coworkers chattering, and the gabble of a subway platform or city street.

A chart showing the exceptional ANC and isolation performance of the Sony WF-1000XM4 true wireless earphones.

Because the foam tips guarantee a good seal, isolation and ANC are incredibly effective on the Sony WF-1000XM4.

Before the ANC unit of the Sony WF-1000XM4 can even try to cancel noise in your ear canal, the foam tips will have blocked at least some of the sound reaching your eardrum. That’s pretty good—it means street noise will sound about half to one-quarter as loud as it would with poor or no isolation.

When you turn the ANC on, droning sounds from 50Hz and higher will sound roughly one quarter to one sixteenth as loud as they would without anything in your ears. That’s seriously impressive, and while it’s not the best ANC performance we’ve ever seen, it’s among the greats. Good isolation is the best way to protect your hearing and prevent noise from damaging your music’s perceived quality, so the result above is an uncommonly good one.

If the idea of not being able to hear the world around you freaks you out, you can toggle the ANC function of the earphones to allow some sound through. Tapping the left earbud will cycle through these modes: do so, and keep tapping until you hear “ambient sound” spoken in your ear. Once there, you should notice environmental sounds a lot better. Additionally, the Sony WF-1000XM4 comes with a “speak to chat” feature that will automatically enable audio passthrough if you start speaking with someone so you can chat with them. It’s a nice quality of life feature that allows you to keep your earbuds in for a quick conversation, which should be useful for in-flight service or brief interactions in the world once that starts opening up more.

How good is the battery life?

If you’re worried about battery, don’t be. The Sony WF-1000XM4 can last about 7 hours and 43 minutes per charge, and the case can charge the buds at least two more times for a total of a hair under 24 hours. You’ll likely only have to charge your case on weekends even if you’re a regular commuter. Sure, it isn’t the best battery life we’ve ever recorded for true wireless earphones, but there’s a lot going on under the hood here.

Is the microphone any good?

The Sony WF-1000XM4 has a decent mic, but it suffers a little bit over AAC. It’s perfectly fine for phone calls, though. There’s also a feature that will detect when you speak to help the mic determine what sounds you want it to boost and what’s just noise. It’s a useful feature, albeit one you may not notice as much. But that’s really the point: Sony doesn’t want you to think about this sort of thing, it just wants your audio to be decent.

You can hear a sample clip recorded on an iPhone 12 below:

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Should you buy the Sony WF-1000XM4?

If you have the money, the Sony WF-1000XM4 is a good buy, not just because it’s one of the best true wireless earphones around, but also because it has the hardware to last a bit longer than most other models when it comes to battery life. $279.99USD is a lot of money to part with over a product like true wireless earphones, but if you want the best, these are currently it.

A photo comparing the relative size of the Sony WF-1000XM3's case with the Sony WF-1000XM4's.

The new Sony WF-1000XM4 (right) has a much smaller case than that of the Sony WF-1000XM3 (left).

Surprisingly, the Sony WF-1000XM4 is not replacing the Sony WF-1000XM3. Instead, it’s driving the price of the older model down (reportedly to $229.99). It may not be as exciting, but those with a little less cash to burn will find the older model a trusty—if clunky—companion. However, the Sony WF-1000XM4 is a better performer in just about every way.

But what about AirPods? This is where things get a little stickier. Coming in at $30 more than the AirPods Pro, Apple users have a bit to ponder before pulling the trigger on a new set of earphones. The Sony WF-1000XM4 definitely cancels noise better, fits better, and offers a steadier higher-bitrate connection than the AirPods Pro, but the AirPods Pro requires less tweaking for the best performance. Additionally, Apple’s integrations with the AirPods Pro are also quite good, thanks to the H1 chip—but the Sony WF-1000XM4 has more than enough under the hood to justify the cost difference.

Frequently Asked Questions

Can the buds be used independently?

Yes, they support independent listening. This means you can charge one while listening to the other.

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Sony WF-1000XM4
8.2