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The Sonos Sub provides an instant upgrade to your Sonos Play speaker system, but it's quite pricey.
If you don't mind its uninspired aesthetics, the Definitive Technology ProSub 800 is a mighty little subwoofer and a fine match for its SSA soundbars and ProCinema satellite speakers.
The Klipsch Synergy Sub-12, the company's most affordable 12-inch subwoofer, sounds great on music and movies.
Klipsch's Synergy Sub-10 is powerful and musical, and that's not something you always find in midpriced subwoofers.