We found that we were using mic sidetone settings here to be able to hear ourselves think while playing or listening to music if we had to talk to friends or family members, which is a testament to the quality. (pocket-lint.com)
Via the SteelSeries Engine software, you can play around with the audio using some simple equalizers, as well as turn on things like sidetone for the microphone. (wolfsgamingblog.com)
You can also use Sennheiser's software to turn Dolby on / off and control the amount of sidetone piped through. (pcworld.com)