Now off the secret list .. nothing spells the US military industrial complex as much as a CE manufacturer that makes you sign confidentiality agreements before they let you in to see it on its release evening.
Sonos think that this Sub is going to be like drone warfare has been to airforces in it's effect on the low frequency transducer marketplace.
The Sonos subwoofer is a flattened and squared doughnut that contains two ingenious long throw narrow profiled opposing drivers slipped into a double Heimholz box.
The sub wirelessly joins and complies with Play3 and Play5's to give ... suddenly and deep bass that can stun goldfish sharing the room.

Introducing the Sonos Sub official website.