KEF CI9000 Rectangle In-Wall Architectural Loudspeaker (Single) Full range speaker suited for high quality music and home theater applications 19-millimeter aluminum dome tweeter, 165-millimeter polypropylene mid-range, and 2 165-millimeter polypropylene bass drivers Built for flush mounting into walls Choice of three grills to match your dcor Recommended for use with a 30- to 150-watt amplifier