Sony and Sennheiser are two companies whose brands are synonymous with great audio products. In recent years both companies have introduced some of the best active noise cancelling headphones around, but in this article we’re going to focus on two of their newest offerings: the Sony WH-1000XM4 and the Sennheiser PXC 550-II. Both were highly anticipated and offer superb active noise cancelling, but which one is right for you?

Editor’s note: this versus article was updated on September 28, 2021, to match style to SoundGuys’ current standards.

Which pair of headphones has better features?

A photo of the Sennheiser PXC 550-II noise cancelling headphones folded on the outside of a backpack.

The Sennheiser PXC 550-II is a great, portable headset for listeners in need of silence wherever they go.

In typical Sennheiser fashion the PXC 550-II focuses less on flashy bells and whistles and more on nailing the basics. It isn’t absent of features, though: you can enjoy bells and whistles in the Sennheiser Smart Control app (available on iOS and Google Play). You can assign either Amazon Alexa or the Google Assistant to the dedicated voice assistant button, enable call enhancement, or toggle smart pause functionality. Smart pause automatically pauses and resumes media playback when the headphones are removed or worn. You’re also able to control the basics and can EQ your music and tweak your noise cancelling preferences, but I’ll dig deeper into those features in their appropriate sections below.

Sony WH-1000XM4 headphones on a yellow couch

The Sony WH-1000XM4 doesn’t look too different from the original except for a few slight tweaks.

The Sony WH-1000XM4 headphones offers most of the same features as the Sennheiser PXC 550-II, and then some. Aside from also having a voice assistant button, an option to EQ your music in the Sony Headphones Connect app, and an auto-pause feature when you remove the headphones, the Sony WH-1000XM4 also has a speak-to-chat feature. When this is enabled, music automatically pauses if the mic detects your voice. In my full review, I found this to be more of a gimmick as it was too sensitive for my liking. Simply chuckling while listening to a podcast caused playback to automatically pause.

The WH-1000XM4 support passthrough listening.

The WH-1000XM4 also supports passthrough mode, which lowers the volume of your music and allows external noise in when you cup your hand to the left ear cup. This is helpful if you’re commuting or on a plane and need to hear an announcement. One cool feature that you’ll only find on the Sony cans is Sony’s 360 Reality Audio compatibility. This is similar to Dolby Atmos, and each channel is re-engineered as an audio object that may move freely around you in 3D space. The end result is a more immersive experience. Keep in mind that you need to be subscribed to a high quality streaming service like Tidal or Deezer to take advantage of it.

Both pairs of headphones use a combination of buttons and touch gestures for playback control, which requires some getting used to. Once you get the controls down, you shouldn’t have too many issues or accidental pauses.

Which one has a better connection?

Sony WH-1000XM4 headphones next to iPad Pro on a marble surface

The addition of Bluetooth multipoint means you can stay connected to two devices at once.

While both headphones offer many of the latest specs, the Sennheiser PXC 550-II headphones has a slight lead when it comes to overall connectivity. Not only is it rocking Bluetooth 5.0, it also supports more high-quality Bluetooth codecs than the Sony headphones. If you pick up the PXC 550-II you can expect SBC, aptX, aptX low latency, and AAC support. The Sennheiser PXC 550-II also has Bluetooth multipoint which lets you connect to two devices simultaneously. While it generally works, Lily experienced hiccups while switching between her computer and mobile phone during her full review.

SBC aptX aptX HD AAC LDAC bluetooth codecs profile audio

Represented is the max transfer rate (kbps) of each respective Bluetooth codec (greater is better). Each waveform depicts a transfer rate of 100 kbps.

The Sony WH-1000XM4 headphones also uses Bluetooth 5.0 firmware, and supports SBC and AAC, but they ditch aptX in favor of Sonys’ own LDAC codec. While LDAC offers a technically higher bitrate than aptX, it does so at the cost of connection stability. You’ll also get multipoint support if you go with the WH-1000XM4, but it only works if you use the AAC codec.

Shot of the Bluetooth codec options in Android.

Bluetooth codecs in Android.

It’s worth mentioning here that in our testing AAC doesn’t play well with Android. Meanwhile, iOS devices are only compatible with AAC and SBC. If you plan on using an iOS device this might not matter to you, because both headphones support AAC. Android users, however, should take into consideration which Bluetooth codecs they prefer, and whether or not said codec provides the experience you’re after. On the bright side, both pairs of headphones have a headphone jack so you can plug in a standard 3.5mm audio cable.

Does the Sony WH-1000XM4 have better noise cancelling than the PXC 550-II?

If you’re looking for top-tier active noise cancelling (ANC) then the Sony WH-1000XM4 should be your pick. The previous version, the WH-1000XM3, was already the king of active noise cancelling headsets and the new WH-1000XM4 is even better.

A chart showing that the active noise canceling performance of the Sony WH-1000XM4 is very good

Among the best in its class, the Sony WH-1000XM4 offers very good noise cancelation and isolation.

Looking at the graph above gives a good idea of what to expect from this pair of headphones. The blue line represents the noise cancelling performance, and the higher it is, the more noise is cancelled at the corresponding frequency. For the Sony WH-1000XM4, that line is best in class. You can see a large peak between 200-500Hz, which is where most humming sounds lie; these sounds are dramatically quieted by the time they reach your ears. It even does a great job at removing sounds below 100Hz, and outperforms other headphones in this space.

Both headphones have unique noise cancelling features you can toggle in the app

Both headphones offer the option to tweak noise cancelling intensity via their respective apps. The Sennheiser PXC 550-II and the Sony WH-1000XM4 offer adaptive noise cancelling, which automatically adjusts the strength of the ANC depending on your environment. They each also offer a unique noise cancelling feature that can only be accessed in their respective apps. In the Sony Headphones Connect app you can calibrate the noise cancelling to your environment which can be helpful if you find yourself on a plane. Meanwhile, in the Sennheiser Smart Control app you can select the anti-wind ANC mode for when you find yourself outdoors.

An attenuation chart depicting the Sennheiser PXC 550-II noise cancelling performance overlaid atop the passive isolation performance; low-frequency sounds are heavily attenuated and sound 1/2 as loud as they sound sans-ANC.

Low-frequency sounds are heavily attenuated and sound 1/2 as loud as they sound sans-ANC, making the PXC 550-II a great option for air travelers and commuters.

The Sony WH-1000XM4 may be best in class, but the noise cancelling in the Sennheiser PXC 550-II is nothing to sneeze at. While the noise cancelling isn’t as strong in the 200-500Hz range as the WH-1000XM4 is, it’s still great at blocking out annoying hums lower than around 100Hz. In her full review, Lily noted that the ANC isn’t strong enough to completely isolate against construction noises but performs admirably when it came to the drill that was being used to install her apartment doors.

The Sennheiser PXC 550-II has better battery life, kind of

The Sennheiser PXC 550-II noise cancelling headphones buttons located on the back of the right ear cup.

The Sennheiser PXC 550-II is a portable and comfortable headset.

 

Testing battery life is about as easy as it gets, and the Sennheiser PXC 550-II technically comes out on top. Sennheiser claims that you’ll get about 20 hours on a single charge with ANC turned on, but in our testing it lasts exactly 21 hours, 58 minutes. The PXC 550-II isn’t perfect, and comes with its own sets of issues. It charges via microUSB which is an issue, but at least it supports fast charging: 10 minutes of connection supplies 90 minutes of playback. While this pair of headphones is less expensive than the WH-1000XM4, it still isn’t cheap. The fact that it doesn’t come with a more modern USB-C charging input is a drawback.

Close-up of 3.5mm input on Sony WH-1000XM4 headphones

The WH-1000XM4 has a ton of Bluetooth codec options but thankfully still has a place for a standard 3.5mm audio cable as well.

On the other hand, the Sony WH-1000XM4 has both a USB-C input for charging and a quick charge feature that gives five hours of playtime after just 10 minutes. In our testing the WH-1000XM4 headphones last exactly 19 hours, 59 minutes. To test both of these headphones we made sure to max out ANC and play music at a constant output of 75dB. It’s worth mentioning that while 20 hours is still an impressive number, the WH-1000XM4 technically doesn’t perform as well as the Sennheiser PXC 550-II. This is even more surprising when you consider that the previous WH-1000XM4 tallied an impressive 24 hours of constant playback.

Does the Sennheiser or Sony headset sound better?

A chart showing the frequency response of the Sony WH-1000XM4 compared to the SoundGuys' house curve.

The Sony WH-1000XM4 default frequency response amplifies bass and treble notes a bit.

Picking between these two headphones based on sound quality is tough, because they both sound excellent. Bassheads won’t be too happy as both headphones have a neutral-leaning frequency response. This means audio reproduction is accurate, which can be off-putting to listeners accustomed to cheap headsets that greatly exaggerated low frequencies.

A chart depicting the Sennheiser PXC 550-II frequency response which is neutral-leaning across the bass and midrange spectrum.

Sound reproduction tightly follows the line of platonic ideal up until upper-midrange frequencies, making this a great headset for traveling audiophiles.

The good thing about headphones with a relatively flat frequency response is that it’s great for EQ tinkering. You don’t need to know how to equalize music to take advantage of this because both apps have a few presets you can choose from. While you can read the sound quality sections of the full reviews if you want to dig deeper into the details of sound quality, you really can’t go wrong with either one of these headphones.

Let’s talk about microphone quality

A picture of the Sennheiser PXC 550-II worn by a woman reading on a porch.

The headset is still comfortable to wear with glasses.

Microphone quality is an important aspect of wireless headphones that often gets overlooked, and between these two the Sennheiser PXC 550-II has a better sounding mic. It has a triple-microphone array that, when paired with some wind noise-cancelling tech, results in relatively clear vocals. The mic isn’t consistent in reproducing every single frequency in the range of about 100-3000Hz (which is where most of the important parts of a human voice lie), but it does a good enough job that we feel confident people won’t have problems using it every day.

The Sony WH-1000XM4 headphones does a better job with notes around 1000Hz (likely to negate the proximity effect) but it also has a pretty significant drop-off under about 200Hz. This means that the built-in mic struggles reproducing lower notes, so users with a deep voice won’t come across as loud.

Sony WH-1000XM4 microphone sample:

Sennheiser PXC 550-II microphone sample:

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Should you buy the Sony WH-1000XM4 or Sennheiser PXC 550-II?

The best pair of headphones for you really comes down to a few key factors: Bluetooth codec support, charging method and efficiency, noise cancelling performance, and your budget. While Bluetooth codecs might not be a big deal for most, some people take issue with the limitations of the Sony WH-1000XM4 seeing as you can only use Bluetooth multipoint with AAC. If you prefer the higher quality of LDAC then this might be a determining factor. The Sennheiser PXC 550-II has no limitations to which codec to use for multipoint, but it’s also slightly less stable than the Sonys in our experiences.

Sony WH-1000XM4
All prices listed in USD unless otherwise specified. Prices may change over time, and vary by region. Unfortunately, we cannot list Amazon prices on the site, as they vary greatly by currency.

Then there’s the method of charging to consider. While both headphones get more or less 20 hours of constant playback, the Sennheiser PXC 550-II lacks a USB-C charging input, which the Sony WH-1000XM4 houses. Most devices being made today will have USB-C charging, so buying a USB-C compatible product now means one less cable you need to carry around with you in the future. A single USB-C charging cable will be sufficient to charge all of your devices.

As far as noise cancelling goes, it’s clear that the Sony WH-1000XM4 comes out on top here. If cancelling outside noise is what matters most to you then you’re not going to find a better pair of noise cancellers than the Sony WH-1000XM4. The Sennheiser cans is a top-notch pair of noise cancelling headphones, but the Sonys is better, full stop.

On the other hand, the Sennheiser PXC 550-II does have one advantage over Sony’s offering. The PXC 550-II is prone to price fluctuations throughout the year, meaning that if you decide to buy a pair of headphones at the right time, you can get Sennheiser’s cans at a great price. For example, as of September 28, 2021, the Sennheiser PXC 550-II is available for under $200 USD on Amazon—which is a steal, considering its sound quality and audio codec support.

Sennheiser PXC 550-II
All prices listed in USD unless otherwise specified. Prices may change over time, and vary by region. Unfortunately, we cannot list Amazon prices on the site, as they vary greatly by currency.

What about the Apple AirPods Max?

The Apple AirPods Max noise cancelling headphones in pink against an off-white background.

The new Apple AirPods Max come in Space Gray, Sliver, Green, Sky Blue, and Pink (shown).

Apple is hitting the ground running with its first pair of over-ear headphones: the AirPods Max. The company’s latest flagship audio accessory touts a slew of features that aim to compete with the likes of Sony and Sennheiser. The AirPods Max includes similar hybrid noise cancellation technologies that were originally introduced with the AirPods Pro, and the AirPods Max has the best raw noise cancelling performance we’ve seen in headphones. Three outward-facing microphones are used to detect and attenuate ambient noise, while a single inwards-facing microphone monitors the sound reaching your ears, helping eliminate inner-ear resonances.

Other features that make the AirPods Max a contender in the noise cancelling headphones market include its unique design, Adaptive EQ, Spatial Audio, Transparency Mode, fast-charging, and a 20-hour battery life. That’s not to mention its sound quality is truly pristine. Of course, all these premium features come at a premium of price tag, with the AirPods Max retailing at $549 USD.

Next: Sony WH-1000XM3 vs Sony WH-1000XM4

Frequently Asked Questions

But which is more comfortable?

While comfort is a subjective metric, we would say the Sony WH-1000XM4 and Sennheiser PXC 550-II are roughly on par with one another. The Sony WH-1000XM4 is slightly heavier than the Sennheiser PXC 550-II and Adam reported a bit of discomfort at the crown of his head when wearing the Sony cans for long periods of time. However, Lily reported a similar phenomenon when wearing the Sennheiser cans for too long a period. That isn't to say that these are uncomfortable headphones—you will likely only experience discomfort if you wear them for several hours at a time.

Are the Sony WF-1000XM3 comparable to the Sony WH-1000XM4?

The Sony WH-1000XM4 have superior noise cancelling compared to the Sony WF-1000XM3 true wireless earbuds, but the WF-1000XM3 are still very good. These earbuds give the Apple AirPods Pro a run for their money, and the same granular EQ module used for Sony's flagship headphones. Even if you aren't a big fan of how in-ears fit, there's a good chance you'll find comfort with the WF-1000XM3 because Sony provides an array of ear tips, all of which vary in size and material. If you don't have enough space in your bag for headphones, the Sony WF-1000XM3 are a great pair of noise cancelling earbuds with few compromises.