@volly You should google around about the GSX. There were plenty of threads/reviews/comments last year around the net on the GSX not outputting adequate volume. I'm sure it can be somewhat subjective as some people may have hearing loss and some may be sensitive. From my perspective you should really try testing the GSX out before purchasing. The surround is not any better than any other emulated surround out. The DAC on the GSX is horrible and there is no AMP in it even though it is marketed as an AMP. So it's just an expensive touch screen half-assed equalizer that emulates surround about as good as every other emulator. The GSP 500s do sound better if you throw more power at them, (I would assume the 600's are the same just closed back). I own 2 pair of the 500's and they are the same. Just like a decent pair of AKGs, they clean up with power. I'm not saying you need a big AMP. The standard 600ohm on many a soundcard is plenty. And for me personally, being an oldschool FPS player from way way back, sound quality is everything. Those tiny slight "gives" that no one else hears in game. That's not coming from a surround emulator my friend, that is the DAC. Without decent sound quality that surround emulation gets you nowhere. And for me, sitting here right now going back and forth between my GSX 1000 and my BlasterX G6 with the GSP 500s, the surround on the GSX is more like the Dolby Headphone surround (Heavy Reverb) when the Creative surround emulation sounds more natural to me. Some people prefer the Reverb sounding surround and some don't. I personally don't. So it boils down to your preference on surround emulation and if you care anything about the quality of sound you are hearing. This is why I really hope you can sample the device before purchasing. No matter, good luck whichever way you go!