Closer Examination, Build Quality and Comfort

Its extreme flexibility immediately becomes apparent as soon as you take the Cooler Master MH670 out of the box. You can literally bend it in any direction your heart desires without it ever creaking or showing any other signs of poor build quality. The ear cups are affixed to a pair of joints and can be rotated inwards by 90°, which is a welcome feature as it helps you hang the headset around your neck or set it flat on a table. Such a high level of flexibility results in terrific adjustability to any head size. With that comes fantastic wearing comfort. This is indeed one of the most comfortable headsets on the market. It can be worn for many hours at a time—it will never hurt your ears or press against the sides of your head too tightly.


The inner side of the headband is nicely padded and covered with pleather. A combination of pleather and memory foam is also used for the ear cushions. Both of those parts of the MH670 are very soft and well made, further adding to its excellent comfort.


The left and right ear cup are marked with their respective symbols, printed inside the ear cushions. The ear cushions are completely removable. If you're not into pleather, you can simply replace them with a different kind of material. The wired MH630 and MH650, for example, come with mesh fabric ear cushions (the inner side of their headbands is also covered in mesh fabric). Pleather ear cushions result in better passive noise isolation, but also cause more heat build up around the ears. In terms of sound quality, I didn't notice any significant differences between those two types of ear cushions. That's not to say that the MH630, MH650, and MH670 sound the same—they definitely do not.


The outer headband is made out of dense plastic, as are the ear cup hangers and ear cups themselves. Like with last year's MH751/MH752, Cooler Master decided to keep the design as clean as possible, so there are no iffy "gaming" details anywhere. There's just a subtle logo on both ear cups, and that's pretty much it. Together with a black-on-black color scheme, the MH670 looks stealthy and nice. Okay, if you're a fan of an in-your-face design, it probably won't be to your liking, but a headset like this will easily fit into any room.


The height of the headset can be adjusted by sliding the ear cups up and down the inner frame made out of metal. There are no markings that would help you adjust both sides equally, but you can hear distinct "clicks" when changing the height, so you could simply count them—not that it particularly matters.


On the lower edge of the right ear cup, you'll find the power button, Micro-USB charging port, and 7.1 virtual surround sound button. Not opting for the USB-C port, which would be a much more appropriate choice in 2020, is one of few drawbacks of the Cooler Master MH670.


Other controls are on the lower edge of the left ear cup. Here, we have an analogue volume dial and a microphone mute button.


If you want to use the Cooler Master MH670 in wired, analogue mode, the appropriate 3.5-mm connector equipped with a twist-lock mechanism is also located on the left ear cup. The supplied audio cable terminates in a 3.5-mm 4-pole (TRRS) plug. Cooler Master didn't supply a 3-pole (TRS) splitter cable, so you won't be able to use the microphone in wired mode on a device that has separate audio input and output. Sure, such a splitter cable is cheap and easily obtainable, but that's only more of a reason for Cooler Master to bundle it with the headset.


Finally, the left ear cup contains the microphone connector, tucked away behind a rubber cover. I'm not a big fan of this solution. While the rubber cover protects the connector, it makes the headset look uglier whenever the microphone is plugged in, as it can't be removed—the cover just hangs there, leaning against the microphone plug. I seriously doubt there are that many users who will use their gaming headset as their mobile headphones; most people will leave the microphone permanently connected. It's a mistake to cater to such a minority.


The arm of the microphone is covered in a series of metal rings that make it easily bendable yet very stable. The microphone capsule doesn't come with a pop filter, which would be a nice touch and a cheap way to make the headset look even more professional.


If you want to connect the MH670 to a mobile device while using it wirelessly, you definitely can because of the supplied USB-A to USB-C adapter. As long as your device has an USB-C port, use this adapter to connect the supplied wireless dongle to your device to use it in wireless mode. The adapter has an angled USB-C port, so the wireless dongle won't stick out of the device, which would make it clumsy in use. Nice!