Software & Functionality

Software functionality of the GSP670’s are quite straightforward if you’re running Windows 10; the headphones are simply plug & play both through the GSA70 adapter as well as if you directly connect the headphones via USB. However when you connect both, there’s some interesting side-effects:


Connected both ways, you get 4 audio devices in your sound settings. The GSP 670 entries are the USB connector entries, while the GSA 70 are the wireless dongle connections. However these do not work in parallel; you only have either pair of main and communications audio working, and playing back anything on the other pair will result in no effect.

In terms of details of what the “Communication Audio” is: this is essentially secondary sound channel muxed into the primary audio. However this again isn’t a second full blown audio device as playback is limited to a single mono channel at 16bit 48KHz, with the same characteristics on the microphone recording device.


Playing back audio through the main audio and the communication audio is possible, with the communication audio being overlaid on top of the main audio. The mux happens on the headphone audio SoC, and it’s possible it’s the main source of some further issues we’ll cover in the testing section.

Volume control of the communication audio is done by either the usual sound panel in the OS, or through the dedicated knob on the right side of the headphones. It’s to be noted that this secondary volume knob is relative to the primary volume control of the headphones, meaning that they’re not independent of each other and volume of the communication audio depends on both the secondary as well as primary volume knob controls.

In terms of Bluetooth connectivity, it’s a bit complicated as well. First of all, I didn’t manage to pair any BT device to the headphones while they were connected to the GSA70 dongle. Unplugging the dongle I finally managed to pair my phone.

When not in range of the GSA70 and connected via BT, the headset works as any other BT headset. This also means just one main playback device.

When connected to the GSA70, the BT connection is not able to play back anything and will only engage if you’re receiving a call on your phone. The most annoying aspect here and Sennheiser didn’t seem to think of, is that there’s no way to purposefully actually play back anything over BT if you’re still connected to the GSA70 and in range. Unplugging the dongle is the only way to actually do this.

While not strictly necessary, Sennheiser also offers the “Gaming Suite” application which gives you a few basic controls for the headphone audio as well as serving as an update application for the headphone’s firmware.

Amongst the more basic features, it offers a 5-band equalizer with a few pre-sets such as flat targets, a V-shaped music target and a competitive gaming target which dismisses most low-end frequencies for augmented treble.

The headphones also offer a 7.1 surround sound mimicking setting which gives one the impression of a wider sound stage and one can fine-tune the reverberation amount. I’m not too big of a fan of this and find it detrimental, but apparently some people like it.

The software also offers some basic microphone adjustment features, however I found some features currently not working. In general it seems like Sennheiser’s software suite is a bit incomplete – however it’s something the company openly admits and promises continued development in the coming months.

The biggest issue I found with the software suite is that it’s seeming incompatible with third-party APO plugins, which was a bit of a deal-breaker for me so I left it uninstalled during my general usage.

Teardown & Components Audio Quality Measurement
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  • Andrei Frumusanu - Friday, July 5, 2019 - link

    I thought of ways to measure latency but I didn't have anything practical in order to achieve it.

    In general, latency with the GSA70 dongle wasn't an issue in gaming or everyday usage.
  • willis936 - Friday, July 5, 2019 - link

    Windows stereo mix to output to a known low latency DAC and the device under test. ARTA has a setup for measuring phase if you have a two channel mic.
  • Andrei Frumusanu - Friday, July 5, 2019 - link

    I'll add this in after the AMD weekend is over.
  • bunkle - Friday, July 5, 2019 - link

    Aren't the left vs right frequency responses a little extreme to be down to cup position? Maybe that USB port or the mic boom are causing sealing issues (given the extended bass of the left ear). Was there a consistent difference when you tested?
  • Andrei Frumusanu - Friday, July 5, 2019 - link

    As I mention, it's just possible my budget measurement rig calibration if a bit off, or the positioning of the headphones was indeed a bit off as well. The general shape of the FR remains roughly the same.

    I didn't notice large issues with L/R balance in subjective testing.
  • yacoub35 - Friday, July 5, 2019 - link

    How much radiation is it cooking the user's head with during long-term use? :)
  • Dug - Saturday, July 6, 2019 - link

    Wow, ugly and not good all for $349.
    Thanks for the write up and testing.
  • crotach - Saturday, July 6, 2019 - link

    This just looks so plasticky like it came from a Kinder Egg. I guess it would be ok for 50 euros.
  • Eliadbu - Monday, July 8, 2019 - link

    I wonder how this headset compares to my Astro A50 (gen 3) .

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