Phase Technology CI120 In Wall SpeakerPhaseTech CI120 In Wall Speaker 3 Way In Wall Speaker with Extruded Aluminum Positive Clamping System. Versatile, high performance in wall speaker that can be used to compliment an upper end home system. The CI120 uses the same woofers and midrange tweeter assemblies as the Premier Collection series. The tweeter and midrange assembly absorb the horizontal sound waves through Unicell Acoustic treatment to minimize interaction with the mounting wall