Cooler Master MH751 Headphones Review

Similar to the Cooler Master MH630, the Cooler Master MH751 have a fairly conservative design, with a monochrome black-over-gray color scheme and faux-leather-lined headband. Their detachable boom microphone also helps to give them a more casual appearance than other gaming headphones.

Update 11/30/2021: After receiving user comments regarding the headphones' loose adjustable headband, we have subjectively reassessed the scoring of this box. For the most part, our testers didn't experience issues with the headband. However, if you have a small head, the loose hinges may still be a problem for you, although you may not experience it each time you use the headphones. We have updated our review to reflect these changes.

The Cooler Master MH751 are comfortable. They're lightweight, have plushly-padded ear cups, and don't squeeze your head too tightly. Unfortunately, some users may find the size-adjustable headband a little too loose. If you wear glasses or like wearing a hat as you game, they also may not provide a consistent seal against your head.

These headphones have a middling control scheme. The in-line remote features a volume wheel and a microphone mute/unmute slider, but that's it. It's easy to tell the two controls apart, and the volume slider has stops for the minimum and maximum setting. Unfortunately, there's little in the way of physical feedback as you use the controls, and you won't receive any voice prompts, either.

The Cooler Master MH751 aren't very portable. Like most gaming headphones such as the Turtle Beach Recon 500, they're quite bulky and can't fold into a more compact design. On the upside, their boom mic is removable and their ear cups swivel flat, which slightly reduces their footprint.

These over-ears come with a carrying pouch made of a velvet-like material. It's thin and isn't likely to protect the headphones from water exposure or impacts. It also doesn't close fully, so they could fall out if the pouch is held upside down.

The Cooler Master MH751 are fairly well-built. They're mostly made of plastic, though the padding around the ear cups and headband is lined with faux leather. While their detachable braided audio cable is a nice touch, the ear cup hinges feel somewhat fragile, as though they could break if the headphones are dropped.

The Cooler Master MH751 aren't very stable. Even minor shakes of the head can cause them to slip off. Their audio cable can also snag on something if you wear them while walking around, though it shouldn't be yanked from its socket since it can be locked in place.

• Cooler Master MH751 headphones
• 1/8" TRRS cable
• Y-splitter
• Detachable microphone
• Carrying pouch
• Manual

These headphones have a fairly well-balanced sound profile. While some gamers may want a little more thump and rumble to emphasize sound effects, their mid-bass through the high-mid range is very flat and even. In-game dialogue and music, not to mention the voices of your teammates, should sound full-bodied, clear, and detailed. Unfortunately, they don't offer any sort of sound customization features, like an EQ or audio presets.

These headphones have sub-par frequency response consistency. Their bass and treble delivery are quite sensitive to their fit, seal, and positioning, which could be a more significant issue if you wear glasses or have thick hair.

The bass accuracy is great. The lack of low-bass may rob some sound effects as well as EDM and hip-hop music of thump and rumble, but their slightly overemphasized mid and high-bass ranges result in plenty of warmth and punch. That said, due to their sub-par frequency response consistency, your listening experience may vary.

The Cooler Master MH751 have remarkable mid-range accuracy. In-game dialogue, as well as vocals and lead instruments, should sound full-bodied, present, and clear in the mix.

The treble accuracy is decent. A slight dip in the low to mid-treble range can muddle the clarity of vocals and lead instruments and gives a slightly lispy quality to some sibilants. Since their treble delivery can vary drastically depending on their fit, seal, and positioning, your experience may vary.

The Cooler Master MH751 have good peaks and dips performance. The uneven dip in the low-bass range may result in a bit of missing thump and rumble in some mixes. A bump in the mid through high-bass range can give a slightly boomy quality to some mixes. There's a more dramatic dip throughout the low to mid-treble range that can veil the finer details of some vocals and lead instruments and make sibilants sound dull and lispy. The following peak in the mid-treble range can give some high-notes a piercing, painful quality.

The stereo imaging performance of these headphones is impressive. Their weighted group delay falls almost entirely beneath the audibility threshold, resulting in fairly tight bass and transparent treble. The L/R drivers are also quite well-matched in regards to amplitude, frequency, and phase response, so objects like footsteps and voices should be accurately placed within the stereo image That said, these results are only valid for our test unit, and yours may perform differently.

The Cooler Master MH751's passive soundstage is passable. Due to their closed-back enclosure, they don't produce an especially open listening experience, but their soundstage should still be perceived as fairly natural and speaker-like.

These headphones don't have any virtual soundstage features.

The weighted harmonic distortion performance of these headphones is decent. There's some minor distortion across most of the mid-range at high volumes, but this shouldn't be too noticeable overall. Audio reproduction should be fairly clean and pure.

These are the settings used to test the Cooler Master MH751. Our results are only valid in this configuration.

These headphones do an inadequate job of filtering out background noise. They block out very little ambient noise in the bass range, so you may likely hear the rumble of a passing truck or bus. Thankfully, they block out a decent amount of background chatter and filter out quite a bit of high-pitched ambient noise, like the hum of an AC unit.

These over-ears have satisfactory audio leakage performance. Most of the leakage occurs in the mid-range, but it isn't too loud overall. People nearby shouldn't hear too much of what you're listening to if you're in a moderately busy environment.

The Cooler Master MH751 have a detachable, flexible boom microphone.

The boom microphone has amazing recording quality. Your voice should sound clear, full-bodied, and natural, with very little in the way of distortion.

The boom microphone does a decent job of filtering out background noise. Teammates online shouldn't have trouble understanding you unless you're in a very busy environment.

These headphones don't have a battery.

The Cooler Master MH751 don't have a companion app.

The Cooler Master MH751 are wired-only headphones and aren't Bluetooth-compatible.

The Cooler Master MH751 don't support any wireless connections.

The Cooler Master MH751 come with a 1/8" TRRS cable that offers full microphone and audio compatibility with devices that have an AUX port. They also come with a Y-splitter for devices with separate mic and headphone ports.

These over-ears let you receive audio and use their microphone when you plug their 1/8" TRRS cable into an Xbox One controller jack.

These headphones don't come with a base or dock.