Closer Examination, Build Quality and Comfort

Due to extensive similarities between the GSP 670 and the GSP 500/GSP 550/GSP 600 in terms of design and construction, I'll rehash some of the stuff I wrote about in earlier reviews and point out everything that's been added, removed or in any way changed on the GSP 670.


The Sennheiser GSP 670 is a massive headset. Its earcups are huge, and the same can be said for the headband. It's also the heaviest headset in Sennheiser's current lineup due to the addition of electronics and antennas for the wireless operation. The inner side of the headband is padded with a layer of foam covered in mesh fabric.


As far as construction materials go, Sennheiser opted for a combination of robust, flexible plastic and a couple of metal parts, such as the gray element that connects the ear cup to the headband.


Despite its size, the GSP 670 is extremely flexible, which means it won't have trouble surviving a fall from the table or similar mishap. Even though the headset is predominantly encased in plastic, the overall build quality is excellent. There are no creaks or anything else of the sort.


The massive ear cups completely surround the ears and form a nice seal with the sides of the head. Interesting is that the front of the cushions is covered in a suede-like material, most likely to prevent it from sticking to the skin, which can certainly be an issue with pleather ear cushions in the hot summer months. The sides of the ear cushions are covered in pleather with the intention of improving the passive noise isolation. The ear cushions feel great and do a good job of ensuring a high level of wearing comfort. Even though the GSP 670 is a bit on the heavy side, whoever wears it isn't really aware of it—weight distribution is excellent.


The ear pads can easily be removed and replaced. The part number Sennheiser is using for replacement ear pads is "GSA 601", and they will cost you $21.75. You can also remove the plastic cover plates on both sides of the headband. Sennheiser is currently offering two replacement cover plates with DoTA 2 or SK Gaming branding for $9.95 each.


One feature we rarely see on gaming headsets is the ability to adjust the tension of the headband, which, as a result, changes the clamping force. There are two sliders that can be moved left and right. By moving them, you actually change the tension of the inner metal headband the sliders are attached to. The tightness of the grip increases as you increase the distance between sliders. Meaning, if you want the headset to be as loose as possible, which was my preferred setting as it resulted in good wearing comfort, the sliders should be positioned as close to each other as possible, as pictured in the second photo above. We already saw this exact solution on the Turtle Beach Elite Pro Tournament. It worked great there and works great in the case of the Sennheiser GSP 670 (and GSP 500/550/600) as well.


The ear cups have the freedom to move in various directions in order to adjust to various head shapes. They can also be adjusted in "height"—moved along the headband. Unfortunately, there are no markings on the headband that would make it easier to figure out if we adjusted their height equally. You'll have to play with it a bit and figure out what works best for you.


The right ear cup contains a large wheel that acts as a volume dial. Its circular motion is silent and quite refined, so I had no trouble making even the tiniest of volume adjustments. If you rotate it all the way counterclockwise, the headset will turn off. It's a great volume dial—accurate and easily accessible.


The right ear cup is equipped with a secondary volume wheel. It can only be used on PC and offers separate volume control for the voices of your teammates, which Sennheiser achieves by having the headset register as two separate playback devices in Windows: the Sennheiser GSA 70 Main Audio and Sennheiser GSA 70 Communication Audio. The idea is to set the Sennheiser GSA 70 Main Audio as the default system-wide playback device and then pick the Sennheiser GSA 70 Communication Audio as the playback device in Discord, TeamSpeak, or whatever else you use to talk with your friends. After doing so, the big volume wheel will control the volume of your games and music, and the small one will make your teammates louder or quieter. Another benefit of setting things up this way is that the voices of your teammates won't sound unnatural and muddy with the 7.1 virtual surround sound, as only the Sennheiser GSA 70 Main Audio gets mixed for virtual surround. It's a clever and useful feature with a clean and simple implementation from Sennheiser.


The "Smart Button" on the right ear cup can either switch between stereo and 7.1 virtual surround sound or cycle through available audio presets (Flat, Movie, Music, and Esport). Its exact function is defined within the software driver.


The switch on the left ear cup has two functions. If you pull it while using the headset, you'll hear a voice prompt that will tell you the remaining battery percentage. It's a rough estimation, not an exact one—instead of, say, "67% battery left", you'll hear "More than 60% battery left". If the headset isn't receiving audio from its wireless dongle, the switch will initiate Bluetooth pairing and the headset will automatically pair to a familiar Bluetooth source within its range.


The Micro-USB port is used to charge the battery and establish a wired connection with the PC/console. It's somewhat disappointing that Sennheiser didn't opt for a USB-C port. Here's their official explanation: "The main reason we chose Micro-USB is because we did not feel confident in the connection of the cable to the headset with USB-C. A Micro-USB connection feels much tighter and more secure than a USB-C connection." The tightness of the connection comes into play when the headset is simultaneously charged and used. I have to admit I don't see how a properly implemented USB-C port could be too loose. My gamepad, the fantastic Nacon Gaming Revolution Unlimited, is equipped with a USB-C charging port, and I'm regularly using it while it's charging. Not once did the cable disconnect by accident even though I wave it around much more than a headset.


Staying true to their gaming headset design, Sennheiser integrated the microphone mute function into the microphone itself. If you don't want it to pick up any sounds at all, you can simply pivot it upward. The first photo shows the exact position where a faint "click" can be felt and heard, which will tell you that the microphone has been muted. To use it again, just pull it down until it lands in front of your mouth and start talking. The microphone's range of motion has been implemented in a similar fashion to that of the volume dial, both in terms of smoothness and accuracy. Once you put it where you want it to be, it will stay in exactly that position until you manually change it.


The microphone capsule seems to be identical to the one we saw (and heard) on the GSP 500/550/600, but I don't expect it to sound as good because microphone quality usually takes a massive hit when switching from wired to wireless.