The pairing of an IWS10 in-wall subwoofer with our innovative wood-composite back box means you'll get maximum frontal projection and a minimum of interference in adjoining rooms. So, you can enjoy all that stunning low bass and special-effects work whenever you want, day or night. Bottom line: it's the BB-IWS10.

The BB-C800 is a back box, designed specifically to enhance the speaker's performance. It utilizes the ideal air volume for the speaker, and acts as a sound chamber, directing the critical sound to the sweet spot. It also reduces the sound going to other rooms/floors up to 10db, and provides one hour fire break protection. For use with the C870, C850, C850TT, C800TT, C800 and C790 ceiling series speakers.  
The BB-C650 is a back box, designed specifically to enhance the speaker's performance. It utilizes the ideal air volume for the speaker, and acts as a sound chamber, directing the critical sound to the sweet spot. It also reduces the sound going to other rooms/floors up to 10db, and provides one hour fire break protection. For use with the C660, C650; C645, C640, C620, C610, C605 and C600TT ceiling series speakers.