No, I mean any distance, if it put out 10 watts at 1 inch, it would be 2.5 watts at 2 inches and .625 watts at 3 inches. You would be wasting huge amounts of po

No, I mean any distance, if it put out 10 watts at 1 inch, it would be 2.5 watts at 2 inches and .625 watts at 3 inches. You would be wasting huge amounts of power just to not have a few inches of wire. At 15ft you would need like 5000W to to get .001W at your device. This is not even thinking about the efficiency of converting electricity into sound and back again. You could focus the sound beam to improve things but then you lose the convenience of putting the device anywhere.