[quote name='PrarieD0G']Adjusting the infrared transmitter's output helps a lot in reducing static noise and making things more clear (The dial on the side of it). I was sitting close to the transmitter because I play on a 22" monitor, and I was getting a lot of "buzz" when music was playing in the menu of Battlefield: Bad Company. When I turned down transmitter's output, there was no longer any buzz.[/quote]
Thanks for that info. It sounds like the same thing that happens on Car sterios when you add a satellite radio. You need to adjust the receivers output to get rid of the hiss.
Well, I have done some research on these and the x4s ($200), and the Astro A40;s ($250).
From what I can tell, for the price you can't get anything better.
They seem to be of good quality (hardware). And the sound drop out is typical of any IR transmitter really. I think, by using IR, they shouldn't get any disruption from Microwaves, and Wireless networks.
If you wan't them just for gaming, get them. If you NEED 5.1, you'll have to move up to something else.
The advantage of the X4's is the 5.1 dolby digital sound (with Optical input). But I have heard they still have a Hiss when things are quiet. Also, if you want the x4's for High Def movies, they won't decode dts, or HD audio. But they may work with the XBOX hd-dvd player, because the 360 converts DTS to dolby digital. You can also dissconnect the mic. I'm not sure about that with the x3's.
The A40's are probably the best for sound, and functionality. There is little to no hiss, because they are WIRED. Which of course is the downfall. These are a great set if you don't mind a WIRED headset. But you can also use these with your ipod. Apparently, they supply plenty of wiring options.