Master and Dynamic MH40 Wireless headphones review

By Simon Cohen Published March 14, 2023

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Editor’s note: there’s a newer version of these wireless headphones. Check out our Master & Dynamic MH40 Wireless 2023 review.

Five years ago, Master and Dynamic entered the audio world with its first product, the MH40 headphones. Their elegant and unique design captured people’s attention, as did their sound quality. But five years ago, Apple and other smartphone makers hadn’t yet issued the death warrant for the headphone jack.

As such, the MH40’s wired design was still appropriate. But times have changed considerably. We now live in an era of full wireless audio, whether you prefer to get your tunes from wireless headphones or true wireless earbuds. With this in mind, Master and Dynamic (M&D) has re-introduced its freshman offering as a wireless set of cans: The $299 MH40 Wireless.

All of the touches that made the MH40 a breath of fresh air remain, like the undeniably cool retro-aviator design and premium materials. But make no mistake: These aren’t just the original MH40s without the wire; they’ve been fully re-thought for travelers in 2019 and beyond. Let’s take a closer look.

You simply can’t discuss M&D’s products without spending some time discussing their design. In a headphone market that is largely dominated by hulking black plastic earmuffs, the MH40 Wireless manage to exude classy sophistication, ruggedness, and lightness all at the same time. They combine leather, metal, aluminum, and lambskin to create a sense of luxury.

Considering the almost total absence of plastic, these cans are surprisingly light. At just 267 grams, they’re almost a third lighter than the original MH40s and almost as light as Sony’s featherweight WH-1000XM3. The use of metal earcup slider posts instead of the more conventional adjustable headband adds to the retro vibe without making it look like you’re wearing antennas — something I found was the case on the similarly-styled House of Marley Exodus ANC.

The one thing I wish was here: The folding hinge that M&D introduced on its MH30 headphones. The MH40 Wireless aren’t big, but they would take up less room in your bag if they could fold.

While not as streamlined as some of the more integrated headphones from Sony or Beats, the MH40 Wireless make a style statement before you even switch them on.

The over-the-ear MH40 Wireless have memory foam earpads, which I found very comfortable. They’re magnetically latched to the earcups — a convenient feature should you ever need to replace them. When seated around your ears, they do a good job keeping out unwanted sounds.

However, I struggled a bit with their tendency to shift around on my head unless I sat perfectly still. It took me a while to figure out why, but I believe it’s a combination of the earpads’ profile (there’s only a small amount of contact surface), the mass of the earcups (all of the weight sits quite low), and the small amount of tension provided by the headband.

I should note that my head is much smaller than average for a man, so this may not be an issue for you, but nonetheless, I wouldn’t count on using the MH40 Wireless at the gym.

On the upside, the smaller shape of the earcups makes them way more comfortable when worn around the neck — for what that’s worth.

Are you a fan of deep bass that you don’t just hear, but actually feel as a reverberation through your skull and internal organs? If yes, don’t read any further; the MH40 Wireless are not for you.

Tuned for precision, not power, these headphones are wonderfully detailed but they will disappoint bass fans. Perfect for discovering nuances in your favorite jazz, classical, or folk tracks that your previous headphones couldn’t reveal, the MH40s shine when delivering vocals too. That crystalline quality is amazing as long as you don’t ask it go too low.

What exactly does that mean? Let’s take David Guetta’s Titanium as a case in point. In the opening minute of the track, we get the introductory notes with Sia’s vocals. It’s rendered with beautiful clarity and the MH40s revealed a depth to Sia’s voice I hadn’t heard before. It gave me goosebumps. As it builds toward that first crescendo, your expectation builds as well — toward that beat drop you know is coming.

Except that it never quite does. As delicious as the soaring highs and detailed midrange are, the lack of depth in the lows might leave you wanting more.

Call quality may not be the biggest factor in choosing a set of wireless headphones, but you won’t need to worry about it with the MH40 Wireless. During some brief testing both indoors and outside, my callers had no problem hearing me, saying they found my voice perfectly clear.

Talking to Siri proved equally accurate. Unfortunately, with no pass-through mode, my own voice sounded muffled to me, increasing the likelihood of yelling. Very few non-noise-canceling headphones have this feature, but it sure would be nice if they did.

Setting up the MH40 Wireless and getting them paired was quick and painless. They showed up quickly in both iOS and Android Bluetooth menus and paired almost instantly. Better yet, the wireless connection remained highly stable, even when I wandered several floors away from my iPhone — something that other wireless headphones and earbuds have struggled to do.

You get a pair of cables with the MH40s — a USB-C for charging and a USB-C-to-analog for wired listening. That cable is highly unusual in the wireless headphone space, as most companies simply equip their cans with a standard 3.5mm or 2.5mm headphone jack. The MH40 just has the single USB-C port and uses it for both duties.

Though it works just fine, there are two drawbacks to this arrangement: You may have trouble replacing the audio cable if you lose or misplace it, and you can’t listen to the headphones while recharging them.

Speaking of recharging, if you’re planning on a flight half-way around the world, take a battery pack: The MH40 Wireless last only 18 hours between charges — a surprisingly small amount of time when compared to the monster lifespans on offer at the same price. Still, you can get half of that time back with only 30 minutes of charging, so it’s not too much of a burden to bear.

The Master and Dynamic MH40 Wireless take all of the best parts of the original MH40s and make the package a whole lot sweeter for just $50 more. They’re at their best when you’re sitting in a comfortable chair and you’re able to appreciate the impressive detail and clarity these headphones offer. As long as you’re not a big-bass addict, they’ll delight the senses and set you apart from the plastic-cans crowd.

Yes. You’ll find a number of over-the-ear headphones that outperform the MH40 Wireless and sometimes for less money. Sony’s excellent WH-1000XM3, which routinely show up on sale for less than $300 offer lighter weight, greater comfort, better sound, longer battery life, and even class-leading active noise cancellation. But let’s be honest, the Sonys are about as boring in the style department as you can get. The M&D MH40 Wireless are like a classic sports car — you choose them because they sound great and they make a statement.

Materials and build quality on the MH40 Wireless are very good. I expect that with the appropriate amount of care, they’ll last for many years. One thing I can’t vouch for is the rechargeable battery. It’s not user-replaceable (which is typical of wireless headphones) but M&D provides the following guidance: If you only recharge the battery when it’s almost empty, you should be able to use the MH40 Wireless for 8 hours a day for up to six years before battery life starts to noticeably drop.

Yes. They may not pack the kind of value you’ll get out of other wireless headphones, but they sound great, they’re comfortable to wear, and their unique design is undeniably cool.