SCi Series In-Wall/In-Ceiling Loudspeakers have been designed from the ground up to be our best entry level custom install product. Several of the SCi Series speakers share cutout sizes and accessories with other products for the utmost in install flexibility and performance compatibility, another way Polk Audio combines performance and value. Mix and match SCi In-Wall/In-Ceiling Loudspeakers with Polk Audio RTi Series loudspeakers to create a voice-matched system boasting a realistic surround sound environment without the space requirements of traditional speaker systems (RTi front stage, TCi rear surrounds for example).