For the WF-1000XM4, Sony went back to the drawing board and designed a brand new pair that looked nothing like their class-leading predecessors. Was it a brave move? Definitely. Crazy? Quite possibly. But it worked.
Sony’s WF-1000X range of wireless earbuds has been a dominant force in this category over the last handful of years: the WF-1000XM3 were two-time What Hi-Fi? Award-winners, as were these XM4 in 2021 and 2022. The latest model, the WF-1000XM5, has just scooped a five-star review, too, and could be in with a shout of making that five What Hi-Fi? Best Buy Awards for the Sony WF line in as many years.
Indeed, rather than making the odd refinement here and there, Sony’s engineers went to town on the WF-1000XM4 with an all-new design, a new charging case, a new audio processor and even a new eartip material, and the result was a feature-packed, user-friendly and sonically gifted pair of earbuds. (Perhaps that is why Sony wasn't afraid to make further significant improvements to the new XM5!)
- Read our Sony WF-1000XM5 vs WF-1000XM4 comparison
Unsurprisingly, the Sonys arrived at the premium end of the market. They launched at £250 / $280 / AU$450 in 2021 but a year later could be found nearer the £200 / $250 / AU$339 mark.
In light of the WF-1000XM5's arrival in July 2023, and the XM4's subsequent discontinuation, the last of the stock can be picked up for around £180 / $220 / AU$340 – a real bargain. Check here for the latest Sony WF-1000XM4 deals.
That means they now undercut other five-star noise-cancelling earbuds rivals such as the Sennheiser Momentum True Wireless 3, Bose QuietComfort Earbuds II and Apple AirPods Pro 2, making them even more compelling next to the competition.
As is to be expected from a brand-new model, the Sony WF-1000XM5 cost significantly more – £259 / $299 / AU$499.
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Initial contact with the WF-1000XM4 may perhaps be a surprising one. Sony has ditched the usual glossy box for recycled packaging made from a special blend of paper. This makes for a more compact box (34 per cent smaller than the WF-1000XM3’s), and one that’s plastic-free. That's great news for the environment, even if it doesn’t really give off the vibe that you’ve just bought a pair of premium noise-cancelling headphones.
Bluetooth version 5.2
Battery life 8 hours (BT + ANC), 24 hours (total)
Voice control Google Assistant, Amazon Alexa
Weight 7.3g (per earbud)
Once you’ve liberated the WF-1000XM4 from their packaging, you’re greeted by a small, black charging case. It’s smaller than the case that comes with the Bose QuietComfort Earbuds, and positively tiny (40 per cent smaller) compared with the charging case that comes with their predecessors.
The case charges via USB-C and also introduces wireless charging to the WF-1000X range for the first time – all you need is a compatible Qi charging pad. You can even battery share with compatible smartphones and piggyback off their power supply, too.
You shouldn’t have to worry too much about the battery life. Sony’s new buds might come with a smaller case, but the XM4’s battery life is actually up compared with the XM3. You now get eight hours of play from the earbuds with noise-cancelling and Bluetooth turned on, and Sony claims the case can supply a further 16 hours of charge. That places their battery life from a single charge above all major rivals, and has been deemed good enough to carry into the WF-1000XM5. The AirPods Pro can only manage five hours, the Sennheiser Momentum True Wireless 3 seven hours and the Bose QuietComfort Earbuds II six hours. Turn off noise-cancelling and the Sony's life is extended to 12 hours from a single charge and 24 hours with the case. A five-minute quick charge is good for one hour of playtime, too.
You can see the life remaining in both the buds and the case through Sony’s Headphones Connect app, which will also give you a reminder when the case drops below 30 per cent charge.
As with all wireless earbuds, battery life can vary due to a number of different factors, such as the quality of files you’re listening to, how hard the internal processor is working, and the volume you’re listening at. During our testing, we found the battery life consistently good enough to get us through a day of mixed use.
Flip open the magnetic case and you’ll see the all-new earbud design of the WF-1000XM4. Based on a combination of customer feedback about the XM3 and research about the human ear, Sony has settled on a rounder body that sits more inside the ear opening. It's a shape Sony has kept for the XM5, though those new earbuds are 20 per cent lighter and 25 per cent smaller than these WF-1000XM4.
The matte finish on each earbud gives the headphones a premium feel, while the small accents around the microphone and sensor holes add a tiny splash of colour. Speaking of colour, the XM4 come in a choice of black or silver.
If you want your XM4 to double as sports or running headphones you’ll be pleased to know they boast an IPX4 rating, making them resistant to “splashing from any angle” – a big improvement on the old model.
Besides the new-look earpieces, the XM4 also have brand new eartips. Made from polyurethane, which feels like a cross between silicone and foam, Sony claims they help secure a tighter, more stable fit. The thousands of tiny bubbles in the tips are also supposed to help reduce and dissipate noise.
The only downside here is that you only get a single set of small, medium and large-sized tips to choose from. Sony says you will get years of use out of one pair, and naturally extra tips should be available to purchase if you need them.
We don’t have any major problems sliding the earbuds in and twisting them into place. If you are struggling for a seal, you can pinch the tips and slide them into your ear canal, until they expand. We find they sit snugly in your ear opening, but they are comfortable over longer listening sessions. If you don't like eartips burrowing into your ear canals, however, you should know that Sony has recently created the LinkBuds for such preferences. And for those with smaller ears or who don't necessarily want an earful of earbud, there's the even newer LinkBuds S, which Sony says are 41 per cent smaller and 33 per cent lighter than the XM4.
To make sure you have the perfect fit, Sony has introduced a new air-tightness test, accessible through its Headphones Connect app. The app fires out a test tone and reports back on whether or not you need to make any adjustments. It’s worth trying out, especially if you feel the sound is lacking bass or there is outside noise leaking in.
In fact, we’d recommend installing the Headphones Connect app when you first connect the XM4. It gives you direct access to all the key features and functions of the earbuds so you can choose which ones to enable and disable. It also helps you get set up for listening to music in Sony’s 360 Reality Audio format from compatible streaming services such as Tidal and Deezer.
The circular outer surface of each earpiece is a touchpad and, by using the Headphones Connect app, you can customise the functionality of each one. They can control volume and playback or switch between noise-cancelling and ambient sound modes through the usual combination of taps, presses and long holds – and the headphones are quick to respond to these actions. Switching between sound modes, changing volume and activating and deactivating features such as Quick Attention (which drops the volume of what you’re listening to, so you can have a quick conversation without having to remove the earbuds from your ears) happen with minimal fuss.
The Sony WF-1000XM4 borrow the Speak-to-Chat function that debuted in the WH-1000XM4 over-ear headphones and is now part and parcel of every premium Sony headphone and earbud that has followed. This feature allows you to talk to someone while the earbuds are still in place and is triggered when you start talking. It works well, although as is the case with the over-ears, it’s only triggered a second or so after you start talking.
This slight delay can be frustrating, as can the tendency for the feature to be triggered by a cough or an impromptu karaoke session while sitting at your desk. You can reduce the sensitivity of the feature, or you can turn it off completely and either use Quick Attention or remove an earbud completely (which pauses playback automatically).
On the inside of the XM4 is plenty of new technology. The earbuds feature an improved DAC and analogue amplifier and are powered by a new Integrated Processor V1 (the newer XM5 have V2 and a superior HD Noise Cancelling processor QN2e). Sony claims this processor provides a clearer sound and even better noise-cancelling than their predecessor. The new model also gets Sony’s DSEE Extreme audio chip with Edge-AI, which we have also experienced in the WH-1000XM4 and XM5 over-ear headphones and now too the WF-1000XM5, and is designed to upscale low-bitrate music files to near hi-res quality.
The 6mm driver used inside the XM4 is similar in size to the one used in the previous model, but it’s made from a new material and features a bigger magnet, which Sony claims helps improve sound quality and noise-cancelling, especially with certain low frequencies. For comparison, the XM5 gets a new 8.4mm Dynamic Driver X instead.
There’s no aptX HD support onboard, but the XM4 support Sony’s LDAC format, which, streamed over Bluetooth from a compatible source, allows hi-res audio files up to 24-bit/96kHz to be transmitted at data rates of up to 990kbps.
Sony has also aimed to deliver clearer call quality with new features, including beam-forming and the use of a bone conduction sensor that stops the mics from picking up distracting ambient sounds while you’re talking. There’s even an automatic wind noise reduction mode that attempts to cut out swirls of noise passing through the headset and into your ears.
All of this works with Sony’s Precise Voice Pickup technology, originally introduced in the WH-1000XM4. The net effect is an impressive call quality for a pair of wireless earbuds. The technologies all combine to do a solid job of dampening down outside noise and interference, especially for the person on the other end of the line.
The general level of noise-cancelling is excellent, especially for a pair of wireless earbuds. Not everyone likes that ‘vacuum’ feeling you get when it’s turned on, but it’s extremely effective through the Sonys and you’ll struggle to find better noise cancellation at this lowered price tag. Their closest competitors in this regard are the pricier Bose QuietComfort II and Sony WF-1000XM5, which both handle noise even more confidently.
Android users will be pleased to hear the Sonys are compatible with Fast Pair so you can get up and running with minimal fuss. You receive a battery notification pop-up on your smartphone when they power up and you can even track their location down using the Google Find My Device app.
Unfortunately, iOS users don’t get any such pairing perks, but all you need to do to start pairing is open the case and take the headphones out. At launch, Multipoint Bluetooth (allows you to connect the headphones to two different Bluetooth devices simultaneously) wasn't enabled on the WF-1000XM4 but did finally arrive as part of a firmware update which dropped at the end of February 2023.
In terms of stability, we use an Apple iPhone 12 and Macbook for the bulk of our testing and find the connection to be rock solid with no dropouts, even in more built-up areas.
Before we get to the WF-1000XM4’s immense musicality and expressive dynamics, we should note the way the headphones handle bass. The quality of bass and the clarity of low frequencies is stunning. There’s such a fantastic level of detail on display that it makes some rivals sound congested in comparison, although the Bose QuietComfort II are more than competitive in this department.
We’re keen to hear how the earbuds handle one of our favourite bass-heavy test tracks, Massive Attack’s Angel – and we’re blown away by the confidence with which the song is dispatched. Every element of that pulsing bassline is precisely deployed and dripping in texture. It’s the clarity around the notes that really grabs you – it allows the WF-1000XM4 to communicate intricacies in the bass notes that other headphones struggle to uncover.
But it’s not a sound that purely favours low frequencies. There’s clarity across the board and a sense of rhythmic precision that allows the Sony’s to switch pace effortlessly. They sound as at home keeping up with, and succeeding in not being tripped up by, Radiohead’s 15 Step as they are dispatching the slow, deliberate swagger of Nina Simone’s Feeling Good.
Simone’s effortless vocal oozes class and sophistication, with every nuance in her delivery laid bare for the listener. Combine the emotion in her voice with the impact of the piano, percussion and wind section and the Sony’s create a captivating sound you can’t help but be swept away by.
If you are wondering whether the WF-1000XM4 are a step up from the WF-1000XM3, we can confirm that they are. The newer model sounds more informative and uncovers more subtle detail. Bass notes are better defined and the overall sound is better balanced. Even the much-admired Sennheiser Momentum True Wireless 2 struggle to match the Sonys for tonality and refinement. Spend a little more and you get to the Bose QuietComfort II which do pip the Sonys in some areas, but you will have to cough up more cash.
You can hear that refinement and natural tone shine through as we listen to Ludovico Einaudi’s Experience. From the delicate, deliberate piano strokes at the start to the soaring strings at the song’s climax, the Sonys bring the individual personalities to life and mix them together like the ingredients of a fine cocktail.
Unsurprisingly, Sony has upped sonic quality once again for the new WF-1000XM5 – something you can read all about in our comprehensive Sony WF-1000XM5 vs WF-1000XM4 comparison. But for their lower asking price, the XM4 remain highly competitive.
We were immediately taken by the Sony WF-1000XM4, and in light of their more affordable price tag still are.
Given all the design changes and new features in these wireless earbuds, it must have been a real challenge to get them right. But Sony absolutely nailed it. The earbuds deliver a satisfying user experience, class-leading battery life, some of the best noise-cancelling we’ve heard in this category, and stunning sound quality. Both Bose and Apple now provide some serious competition, as do the XM4's own successors of course, but while they are still available to buy they are still very easy to recommend at their discounted price.
- Sound 5
- Comfort 5
- Build 5
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