Phase Technology CI-MM3-II In Wall SpeakerPhaseTech CI MM3 II In Wall Speaker 3 inch Compact, Full Range In Wall Speaker. The Spacia CI MM3 II is designed to fit into a standard double gang box or mud ring, making it simple to install in kitchens, foyers, bathrooms and hallways. The Ci MM3 II includes self resetting solid state PTC protection circuits, which detect when the speaker is being over driven and lower its volume until it is corrected. The Ci MM3 II offers outstanding audio despite