Sonos is getting ready to expand its home theatre lineup, according to multiple leaks that surfaced in the past few days. Photos of a new Sonos product called the "PlayBase" speaker have been featured in a B&H Listing, several tweets and a FCC listing. Base speakers of this kind -- which sit directly under a TV -- have typically received poor reviews from audio fans, but Sonos' proprietary sound-tuning software could give this thing hope.