A:AnswerJust a thought but if your TV is Bluetooth compatible you could get the Bluetooth adapter and connect the speakers that way. If done that way then the source should be able to control the volume. You would also be able to connect your phone to the speakers. I did not buy the Logitech Bluetooth adapter. The one I did get works just fine with the speakers.
A:AnswerYes, speakers require an outlet for power and the product has options for connecting to other devices as well. For the desktop, just plug into a USB port, and play away. The sound was great!
A:AnswerThis system doesn't have bluetooth natively but you could buy a separate bluetooth receiver device and connect it to the right speaker's AUX port to accomplish this.