California-based HPV Technologies recently demonstrated a "magnetic acousticdevice" or MAD that can broadcast a targeted beam of sound for a more than mile.
The sonic lasso is quite a bit more complex and less portable than its rope-based cousin, involving a circular device with 16 sources of acoustic waves.
The AirPlay Audio System by Acoustic Research is better than traditional docking and other wireless devices because you can control your music from your Apple iOS device, giving you freedom as a full-function User Interface (UI) remote.