First off, I believe this is the correct forum for this thread. I read all the descriptions and figured this was the most accurate to what I'm looking for.
The situation: I want to be able to listen to multiple computers' audio from 1 pair of headphones. I found this: http://www.amazon.com/dp/B00102XUX6
but it is unpowered and so people say volume drops running through it. It's also fairly expensive and I'm not sure if maybe that product is something above what I'm looking for, thus there are cheaper options? Let me know if not.
Secondly: I also have a pair of wireless headphones - therefore it connects through USB instead of 3.5mm. Any idea what I could do to make those work on all the computers?