Best wireless headphones?

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I have a decent pair of Sennheiser HD600's and have done for quite a long time now.

Im just curious about the wireless range. Is there any wireless headphones that would beat the quality of what I have now? Or do I need to stay with wired headphones for the quality I am getting?

 

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I thought as much. Thats a shame as well as a surprise, as I thought that my Sennheisers might have been surpassed in some way due to it being a long time ago when I originally purchassed them. Looks like I got quite a bargain in the 1st place with those after all