5.2 Surround Sound System: 5 x sb25 On-Wall Loudspeakers with Dual 12 inch subwoofers. Theory surround sound systems are available in 2.0 to 7.2 or 5.2.2 ATMOS using a single Loudspeaker Controller, or up to 48 total channels using current surround processing technology by deploying multiple loudspeaker controllers within a single system.