whats the difference between 5.1 and 7.1 souround?

Solution
Two more speakers.

5.1 surround has front left, center, front right, side left and side right and the .1 comes from the sub.

7.1 has the addition of rear left and rear right.
Well that really depends on where you live and what's available there.

Also you can get a simulated 7.1 surround (HRTF) headset or the very expensive 7.1 headsets that actually have all the drivers needed to reproduce 7.1 surround sound.

I've had experience with Logitech and Razer's HRTF 7.1 setups and both worked well for me. However due to the nature of HRTF, if your head isn't in the "normal" range or you have oddly shaped ears, it may not work for you.

 

firefoxx04

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The cheepo turtle beach stuff always worked well for me when I played xbox and cod4. Not the most high quality stuff available but it made a huge difference in search and destroy where you need to hear where someone is coming from. Night and day.