Architects and Engineers Specification: The loudspeaker shall be a full-range device, producing frequencies from 80Hz to 15kHz in both horizontal and vertical planes. Total radiating surface shall be 85.5 in2 (532.3cm2). The high-frequency dispersion shall be at least 140° up to 15kHz in both horizontal and vertical planes. The loudspeaker shall have a sensitivity of 94dB (1W/1m) with a power rating of 20 watts RMS according to EIA standard RS-426-A. The loudspeaker shall have an exterior frame constructed of stamped steel, with a powder-coated white enamel finish, measuring 13” (330mm) in diameter and a total unit depth of 23/8” (60mm), not including backcan. Mounting facilities shall be screw mount. The complete unit shall weigh no more than 4.2 lbs. (1.9kg). The loudspeaker shall be the Sound Advance CT8 or equivalent.