Is my Turtle Beach P11 headset defective?

Just got this headset, if I'm hooking it up using avi it will only work if I plug in one side and not the other (for example, if I only plug in the Audio R(or just the L), and not the left one, it works just fine, but I assume that makes the surround not work, sound comes out both earcups but I assume it's the same sound from both). If both are plugged in, I hear some sounds but not others, for example I hear a slight bit of vocals and guitar from songs, but not other instruments, or just scratching noises from other instruments. If I plug it into the computer I hear the same thing (as I do not have the option to just plug in the left or the right). If I plug it into my iphone I just do not hear anything.

Can anyone help with this? Is this headset defective? I got it used on ebay, but I got it at a fairly cheap price, and I've never actually shipped anything before so returning it would honestly be more hassle than it is worth, I'd sooner just use it for now and get a wireless headset so I don't have to deal with wires sometime later on.

Most Turtle beaches easily break after a few months. Next time you get a headphone get sennheiser.

http://comparefroggy.tumblr.com/post/57061687084/sennheiser-gaming-headset

No mine did that too and same with my friend

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