For gaming an movies, yup, has to be 5.1 or 7.1. For music, good old stereo is more than enough. The problem with the 5.1+ systems is space, orientation and alignment of speakers. If you don't have shelf space behind you, then there is little point buying a 5.1 system. It took days of minute tweaking on an off to get my Logitech setup when bought. Balancing out the front and rear volume and such to create the perfect enveloping bubble of sound.... It's wonderful when it works and is balanced, it's just time consuming to get it right.
I really do want a 5.1 set of these speakers and if people make enough noise, Corsair will really listen. People wanted a non USB based set of the HS1 headset - not long after, it announced the HS1A. (waiting on a pair btw
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Setting up these speakers for 5.1 would be quite expensive if I am to be honest though. The system already has 6 amplifiers, add another 3 speakers to the mix and that's 12 amplifiers to contend with. That would put quite the strain on the active crossovers as well as power, talking another 168 watts on top of the 232, so a 400 Watt system. I'm sure Corsair could do it, no question, it has the experience with PSUs. My concern will be cost. At $250, these ain't cheap. Tack on another three speakers and the associated overhead, probably talking $350-$400, most likely the latter. Would still love it though.
In fact, i'm pretty sure they've been developing a set all this time, would be silly not to after putting this 2.1 and the the headsets together. What they do after... no idea. I'd be concerned if they went with a 5.1 headset though... i'm still not 100% convinced about the audio quality of tiny positional speakers, but who knows....