Sound Quality

All three new Cooler Master headsets use a pair of 50-millimeter dynamic speaker drivers. Their specified frequency response spans from 20 to 20,000 Hz in both USB (MH650) and wireless modes (MH670), and from 15 to 25,000 Hz in analogue mode (MH630 and MH670, when connected with a cable). Even though it appears they're based on same speaker drivers, their sound performance isn't identical. This is the conclusion I came to after directly comparing them for several hours, interchanging their ear cushions—the MH630 and MH650 come with mesh fabric ear cushions, and those supplied with the MH670 are made out of pleather—and connecting them to the same sound source where possible—the MH670 can be used in wired mode, which allowed me to connect it to the same sound card as the MH630.

The overall sound performance of the Cooler Master MH670 is arguably the best of the lot. Its sound signature is audibly warmer and bassier than with the MH630 or MH650, as well as smoother in the high range, which is why the MH670 is comparatively easier to listen to. Not that any of them are exactly harsh—it's just that the MH670 is more likely to bring a smile to your face with the sound it delivers, and you won't find yourself in a situation where a vocalist or an in-game sound effect might be piercing.

The bass isn't only quite deep, it also has a satisfying punch. Some sluggishness and overhang can be heard, although I wouldn't go so far as to call it sloppy or boomy—it manages to stay in line even in more complex music pieces or in-game/movie scenes. The mid-range is somewhat recessed, and it could definitely use a bit more air. It's still clean and present, but nothing was done to push it forward, so there's no strong emphasis on vocals or anything else within that part of the frequency range. In very complex songs, vocals can be overwhelmed by instruments, such as multi-layered guitars.


In terms of spatial positioning and general awareness, I have no complaints. I used the Cooler Master MH670 in Call of Duty: Warzone which, granted, has a horrible sound engine, but also in games like Apex Legends, PUBG, Battlefield V, and Rocket League, where it didn't keep me wondering about where I'm getting shot from. Yes, there are more informative headsets on the market, primarily those that don't have a recessed mid-range. The MH670 trades a bit of that in for some additional warmth, a trade-off many will be happy to embrace. Other than that, the MH670 gets quite loud. I never felt a desire to push it as loud as it can go. In fact, I never even got close. Insufficient maximum volume is a massive issue with some USB and wireless gaming headsets, even very expensive ones, so it's great that Cooler Master made sure the MH670 has no such issues.

Passive noise isolation is very good. The pleather ear cushions form a tight seal with the sides of the head, which is why no sound leaks in or out. In other words, you can safely use the MH670 even if you have others sitting close while gaming—they won't be able to hear what you're listening to, nor will you be bothered by the sounds surrounding you. Aside from the overall sound quality, this is an area where the MH670 differs the most from the MH630 and MH650, as they're equipped with mesh fabric ear cushions which leak some sound in both directions.

7.1 Virtual Surround Sound

The Cooler Master MH670 supports 7.1 Virtual Surround Sound. Most of my testing of the surround sound performance was done in Battlefield V, a game well-known for its superb audio production, and Apex Legends. I also tried it in a couple of single player game, such as Metro Exodus and What Remains of Edith Finch. The surround sound is toggled by pressing the appropriate button on the headset or in the software driver. This feature is only available on PC.

Every gaming headset manufacturer has their own idea of how virtual surround should sound. Cooler Master decided to go with a very subtle implementation to where it's sometimes hard to hear if the 7.1 surround sound is turned on or not. I see this as a good thing because it keeps the overall sound performance in tact. It adds a bit of width to the sound without sacrificing any clarity and depth or introducing unwanted reverb. The bass loses a tad of its punchiness and that's about it—nothing else bad is introduced by using the 7.1 surround sound on the MH670. I never thought I'd be writing this, but I actually found it useful in multiplayer shooters, where it helped me position my targets more easily. Thanks to its inoffensive nature, definitely do try it out—you might end up using it permanently.