Phase Technology CI150 In Wall SpeakerPhaseTech CI150 In Wall Speaker 5. 25 inch 2 Way In Wall LCR Speaker With Patented Positive Clamping Mounting System. The CI150 is unique in that it combines the front left and right channels with the center channel in two cabinets instead of the normal three. Dual drivers and tweeters offer superb sound quality for all three front channels from just two speakers, producing the same sweeping soundstage as the finest multi channel movie theater all