12" Duplex speakers from Altec Lansing are the most popular hotel ballroom ceiling speakers in the world. The Altec Lansing Professional CD912 is an excellent choice for hotel meeting spaces, convention centers, airports & transportation facilities, and any high ceiling applications that require reproduction of high fidelity music and intelligible speech. The loudspeaker consists of a 12 inch / 300 mm moisture resistant cone woofer, a broad dispersion dome tweeter with heat resistant voice coils and die-cast corrosion-resistant speaker frame. A 2,200 Hz second order crossover provides smooth high fidelity transitions. The top cover of the CD912-8C is now pretapped to allow mounting of Altec Lansing Professional’s accessory 16W, 32W, 60W and 100W premium transformers.