Check out the Bose Soundlink Revolve Bluetooth Speaker:

Bose takes sound in a new direction. Every direction.
Meet SoundLink Revolve, one of Bose's best performing portable Bluetooth speakers yet. It delivers true 360° sound for consistent, uniform coverage. Place it in the center of the room and everyone gets the same experience. Or set it near a wall and sound will radiate and reflect around the room, immersing you. Taking it outdoors? Great, it’s meant to go where you go.