Bluetooth for now is short range wireless. While some claims to reach 100 feet I continue to see it in the 33 and less foot coverage. So yes, it does help to be close.
I am thinking about getting a mini (but quality) blueooth player (looking at BOSE) for an mp3 player. Will other players (or bluetooth devices in general) within range interfere with it? I appreciate your help; I don't know anything about bluetooth, I don't even have a smart phone or cell phone (I don't need one).