That's not to say the Void sounds terrible. When using the official release of its companion software (version 1.10.67 at the time of this writing), it provided clean audio across music, movies, and games, with a fair balance between lows and mids. Mids and highs do lack a crispness that would help make background details more distinct, though; some get softened to the point where it can be hard to pick them out. Bass isn't the strongest, either. If you're hunting for pounding lows, look elsewhere. What you hear on the "pure" (non-adjusted) preset is about as much bass as you'll get, even after fiddling with EQ settings in the companion software.
That applies when the Void's surround sound mode is on, too. You won't want to spend much time with it on, though. Turning on surround when using the official version of the Corsair Utility Engine causes a drop in audio quality: voices become more distant and harder to make out, and you don't get clearer and finer directional cues to make up for it. It's simply a better listening experience with the virtual surround off.
The same advice applies to the "Sidetone" feature for the microphone, which allows you to hear yourself through the headphones while talking so you don't sound muffled to your ears. It also introduces a persistent buzzing that only gets louder as you increase the volume. Since you can't really hear yourself with Sidetone set to a lower volume, the best experience is to avoid it all together. You'll still be able to make out your voice reasonably well, since the earcups don't tightly block out nearby external sound, and you won't hear that nasty buzz.
Some of these shortcomings can be solved by instead installing the latest beta version of CUE (currently version 1.11.85). Bass gets punched up a bit; background details gain more clarity; Sidetone's buzzing gets quieter; voices are less distant in surround-sound mode. The beta version of CUE also fixes a host of oddities that we encountered with the official release software (and even one quirk identified by Corsair as a likely firmware issue).
During our tests using CUE v1.10.67, the headset volume inexplicably jumped down at one point when someone began talking in during a Google Hangouts video chat. We got occasional pops and crackles in running audio despite being within a foot of the receiver with a clear line of sight. And strangely, every press of the microphone's mute button (regardless if you're muting or unmuting) lowered the headset's volume; in one instance, it flat-out muted incoming audio. We ran our tests on a Windows 7 machine, which is listed as supported by the headset, so it was all very puzzling.