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So above the USB dongle (USB audio adapter) which you can connect the headphones though with the cable. Basically this is a USB soundcard, it hooks into the Corsair CUE software and from there on allows for Dolby 7.1 Virtualized mode and the EQ.
So the upside here is that you have choices, you could connect these headphones to your HIFI equipment, a smartphone or console audio output. That makes this kit far more flexible to use opposed to USB audio solutions solely. We think it would be good if manufacturers like Corsair would make a move towards more widespread Bluetooth though.
The VOID sounds pretty sweet TBH - a nice and sturdy feel with proper headphone cups that will cover your ears, and do check out that black or optional black/red design. The VOID is your typical big headset, circumaural ear coupling, nicely padded headband, sealed back earcups, but these have the exception of (proclaimed 7.1) surround sound courtesy of Dolby. We'll get into it later as really, this is a stereo headset with a virtualized surround layer on top of it to create the illusion of 7.1 surround.
So yes, the VOID Surround is a standard stereo headset with two 50mm drivers, the headset uses Dolby virtualization to emulate surround sound -- that's a big difference. So this is not 'real' 7.1 channel sound as in 7 speakers and a sub. The big thing here is that software surround is a lot less complicated than stuffing a pair of headphones with 8 speakers. This is an ongoing discussion, 8 (different sized) drivers in the earcups still deliver sounds to your 'two' ears right? Think about it for a while.