PSB Speakers is a household name. The head honcho, Paul Barton, really wanted to recreate the same PSB sound that we all know and love, and put that tech into something a little more portable. Enter the PSB M4U 8s, which feature some fascinating new ideas. This is our first time testing out something from their wireless headphones line, and in this review, we break down the M4U 8s design, comfort and fit, sound, packaging and accessories, specs and more, as well as how they compare to other models. You can also check out our video review.


The PSB M4U 8s reminded us of a luxury Prius. Trust us, this metaphor will make sense in a second.

Created with PSB signature sound | The Master Switch

When held in the hand, the headphones definitely have some weight, which is a welcome design quality here. They’re also built well: nothing about them feels loose or fragile. Even the little switches for volume control, the passive and active playback options, and the Bluetooth button feel like they could take a beating.

The design, though a little old school, is simple and functional, with zero flash. The band and ear cups are made of a synthetic leather, with memory foam cushioning. The cups are highlight of the design, and almost enough to distract you from the rest. Almost.

Because what on earth was PSB thinking when they chose to mix this many materials on one piece of gear? It’s as if they didn’t know which option to go with, so they chose them all. We’re not sure if these headphones even know what they’re supposed to be. Leather, metal, plastic, rubber, matte, glossy? Take your pick. They’re all here.

The M4U 8s may be well built, but they are anything but elegant - a word we’ve used to describe the Bowers & Wilkins P7s (full review). Now those are some fine-looking cans. They may be a little old, but design-wise, they beat the M4U 8s into the ground.

Perhaps the most bothersome part of the headphone design is the rubberized casing on the lower half of the unit. It wraps around the ear cups in a way that makes it absolutely impossible not to touch when hunting for the controls. And man, does it feel gross. This is what ultimately awards them the ‘Luxury Prius’ status: you’ve paid a pretty penny for a plastic vessel with leather seats and rubber mats.

Questionable aesthetic, but solid design | The Master Switch

There’s much better news when it comes to functionality. PSB really wanted to cover all their bases, to make sure that you could use the M4U 8s in any environment. Not only are these headphones wireless using aptX Bluetooth, but they work with analog connectivity via Aux, and digital connection via micro-USB. All of which work pretty damn well, and which go quite a way to making up for our issues with the aesthetics.

We had no connectivity issues using Bluetooth - a breath of fresh air after some of the nonsense we’ve dealt with lately - and could even leave our playback source in another room, with absolutely no glitches. Testing this to the max, we went as far as to walk across the apartment, around the corner, into the bathroom, and climb into our bathtub before we noticed any blips in noise. See what we go through to bring you great reviews?

The battery life is also solid, rated at fifteen hours. But, fear not. If you manage to exhaust the rechargeable batteries on the go, you can actually swap them for standard AAA alkaline batteries. The headphones even have a built-in safety feature to protect them from any power surges/failures if you accidentally plug them in to charge without swapping back. We’ve gotta hand it to PSB for this one. Slow clap.

Stellar connectivity via Bluetooth | The Master Switch


Like a round of tag, we keep jumping back and forth between things we like, and things we don’t.

After talking up the stellar connectivity in the M4U 8s, which more than made up for their design flaws, it’s a real shame to have to bring up another issue: the clamping pressure. These headphones are tight. Not tight, as in “That’s tight, man!” Tight as in, “I ate way too much pasta and now my pants don’t fit.”

This, unfortunately, made it tough to enjoy the headphones for more than an hour at a time - and that’s being generous.

The M4U 8's looks can be deceiving - they aren't that comfortable | The Master Switch

Breaking the fourth wall for a second here: I, Alyssa, have a fat head. Hundreds of years of Finnish inbreeding has left me with a face wider than a dinner plate, and I sometimes struggle to get a good fit with my over-ears. The cups were also a tad small for my ears, and they felt a little cramped.

I don’t shame PSB for not making these headphones with my big head in mind, and maybe a few stress tests would loosen the band a bit if I weren’t worried about damaging the loaner model. And it’s worth noting that TMS Editor Rob did not have this fit problem, but some other listeners have made similar complaints to myself. We suggest testing these first, if possible, to make sure the fit is right for you before making the commitment.

As mentioned previously, the band and cups are made of synthetic leather, with memory foam cushioning. If the headphones fit properly, these are actually pretty comfortable. Not quite floating-on-a-cloud comfortable, but decent enough to have them on your head for quite some time.

Due to their smaller size, these headphones tested great for movie watching - you can really lean back into the couch - and weren’t too intrusive of everyday tasks.

The buttons and switches are built solid | The Master Switch


PSB designed the M4U 8s with stereo speakers in mind. So, it comes as no surprise that the soundstage is pretty wide. The built-in RoomFeel feature, which is noticeable in all active listening modes, does a bang-up job of making you feel like you’re in the center of the mix, listening to tunes on your speakers. This was designed specifically by PSB head, Paul Barton, and we think he nailed it!

The headphones don’t add any special colorization to the music - which can be, arguably, a pro or a con - but it’s easy to get lost in the sound. After wearing them for awhile, you find yourself drifting in and out of reality, as if unaware that the sound source is directly on your head. This feature alone makes the headphones perfect for daily listening - especially if you’re planning on wearing them at work, on the go, or just around the house while you do chores.

Every aspect of the mix is separated, sitting in its own section. We have no complaints of muddiness or lost frequencies, which is impressive in itself. The lows can get pretty powerful, depending on the genre you’re listening too, but they aren’t overwhelming or distracting.

The M4U 8s do a solid job at replicating tracks accurately. You’re not putting them on purposefully to immerse yourself in rich, succulent sound - like the Audeze LCD2Cs (full review). Neutrality isn’t necessarily a bad thing, but it does mean that they don’t stand out amongst the crowd. Like getting lost in the mix, these headphones could easily get lost in a pile of other sub $500 gadgets. However, if you’re a fan of neutrality, you might prefer these over something like the Bose Quietcomfort 35 II - listed in our Best Wireless Headphones roundup - which have that Bose signature sound.

Made from synthetic leather, memory foam, plastic, rubber, and metal... | The Master Switch

If there’s one viable sound complaint about the M4U 8s, it would be that the highs are a touch too bright at loud volumes. Though this makes them fantastic for movie watching and picking out dialogue, it can be a bit overbearing with genres that use a lot of treble heavy instruments. Cymbals, fiddle, and effects get a slight boost, which can cause some listening fatigue after a bit of use. Though you may not notice this while wearing the headphones, you’ll feel some sensitivity after taking them off.

The Active Noise Cancelling (ANC), though marketed as their main selling feature alongside RoomFeel, isn’t necessarily a huge factor in their usability. If anything, the noise isolation - without ANC enabled - does a decent enough job on its own. There wasn’t a noticeable difference with ANC activated - they certainly don’t achieve complete isolation like the Bose Quietcomfort 35 II (mentioned above) but they manage to block out most environmental distractions.

If you wish to hear the outside world for a moment, simply double click the volume switch, and you’ll experience the M4U 8s ‘Transparency Mode.’ This mode uses the ANC’s built-in microphones to enhance exterior noise. It’s a little startling at first if you aren’t prepared for how much it enhances sounds, but definitely a neat feature to have.

The M4U 8s have multiple playback options - both active and passive | The Master Switch

Something PSB prides themselves on, and with these headphones specifically, is having a standardized sound quality amongst all playback options. They aim to get as close to the same quality level with passive, active, and ANC playback modes. This is something they succeeded in, and went above and beyond what companies like Bang & Olufsen fell short of with their BeoPlay H9is. When listening to the BeoPlay H9is, in comparison to the M4U 8s, the ANC on the H9is causes some serious treble boosts. So, although PSB’s noise-canceling isn’t flawless, it’s certainly not outwardly flawed.

Funny side note: Both Bang & Olufsen and PSB have noise-canceling features called ‘Transparency Mode.’

The headphones come with a semi-hard carrying case | The Master Switch


PSB did not disappoint in the way of accessories.

Along with the headphones, the M4U 8s come with a semi-hard, clamshell carrying case, a 3.5mm Aux cable, a micro-USB cable, a ¼” to 3.5mm adapter, extra memory foam pads, a carabiner and cleaning cloth, and an airplane adaptor. Yes, an airplane adaptor.

Does anyone ever actually need an airplane adaptor? We’ve seen them on some Asian airlines, but are pretty sure every airplane in the western world has stuck with the standard 3.5mm jack. Nevertheless, PSB covered all their bases.

The carrying case and package are standard PSB design | The Master Switch

The carrying case is a nice feature, though a bit clunky. If you have a larger laptop bag or backpack, the case functions well as protection from smashing about with the rest of your stuff. Conveniently, the rest of the accessories also fit within the case.

The box is solid, though we don’t think you’ll be keeping it around for watch storage like you would with the Shinola Canfield In Ears (full review). It looks like a typical, mid-to-high quality headphones package, with all the standard information and PSB colors. Nothing more, nothing less.

What’s interesting about the packaging itself is the way the accessories are housed within the box. When you open it up, you’ll see little diagrams and arrows pointing to hidden accessories, tucked underneath the cardboard inserts within the box. It’s like a neat little accessory Easter egg hunt.

The headphones come with a wide range of accessories | The Master Switch


The verdict on these is a little inconclusive. While we loved the RoomFeel feature, and could almost recommend them based on that alone, we weren’t sold on the headphones as a whole package.

In all honesty, personal preference plays a massive role here. In our opinion, they fell just a little too short of the pricetag that comes with them. For $400, you could easily pick up the majority of our Best Wireless Headphones, and get a bit more mileage for your dollar in terms of comfort and aesthetics.

There’s nothing glaringly wrong with these headphones. Like we said before, the comfort issue - which is an automatic turn-off for some listeners - is based on individual results. These might fit you like a charm and be the greatest headphones you’ve ever purchased in your entire life. But, for others, the disjointed aesthetic might be enough to steer you towards a flashier pair of cans, like the Bowers & Wilkins PX.

If you have a few hundred dollars to spend, are looking for a decent, neutral, user-friendly pair of daily listeners, and aren’t interested in a super colorful sound signature, we could recommend the PSB M4U 8s. Or, we could tell you to break the bank and hit up the Focal Utopias (full review), because we’re cool like that.

Note: PSB also carries similar headphones to the M4U 8s at a more affordable price, if you are interested in finding out more, you can click here.

What We Like:

  • Multiple playback options.
  • Decent accessories.
  • Accurate sound.
  • Long battery life.

What We Don’t:

  • Not a huge difference with ANC.
  • Plasticky feel.
  • A little too snug - results may vary.
  • Expensive for the quality.

See the PSB M4U 8

We really need some better headphone names here... | The Master Switch


Sony WH-1000XM2

The Sony WH-1000XM2 headphones- OK, seriously, guys, easy on the name, this isn’t Transformers - won first place in our Best Wireless Headphones roundup. Therefore, they deserve to be our first alternative recommendation.

With thirty hours of battery life, stellar noise cancelation, and superb sound quality, these cans beat the M4U 8s hands down. They’re balanced in every way, even aesthetically. Though the style might not be perfect for every listener, it’s at least consistent. It’s tough to find a better alternative, really.

B&O Beoplay H9i

Another one of contenders in the Best Wireless Headphones roundup, the BeoPlay H9is are a solid comparison to the M4U 8s. No, their noise cancelation feature - called Transparency Mode - isn’t perfect, but they do come out on top in some other ways.

The BeoPlay H9is are a bit more expensive, but those extra dollars go straight to design. These headphones are attractive. They’re something you actually want to put on your head. They don’t have aptX Bluetooth, but the level of comfort and wearability of these things is worth the sacrifice.

Bowers & Wilkins PX

Our beloved. Tried and true. Bowers & Wilkins. If we could, we would compare every pair of headphones to these, and their predecessor - the B&W P7s (full review). Until they get absolutely smashed by competitors, these headphones will always exist in our Best Wireless Headphones roundup.

They sound good, the battery life is better, and they look so much cleaner than the M4U 8s. No, looks aren’t everything, but they do matter to us - clearly. You’re going to be wearing these on your head, after-all. No one wants to walk around with a bad haircut, right? And the fact that the B&W PXs cost the same as the M4U 8s is a bit of a laugh.

Comparison Table:

Headphones Price Batt.* Canc* aptX Type Driver Weight
Sony WH-1000XM2 $348 30 hrs Yes No Over-Ear 40mm 12oz
Bowers & Wilkins PX $400 18 hrs Yes Yes Over-Ear 40mm 11.8oz
B&O Beoplay H9i $499 18 hrs Yes No Over-Ear 40mm 10oz
PSB M4U 8 $399 15 hrs Yes Yes Over-Ear 40mm 12oz

*Batt. = Battery Life
**Canc. = Noise-Cancelation

Video Review:

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