The RSound-CM20T is a two-way white ceiling loudspeaker with a 6.5 "woofer. The woofer cone is made of polypropylene, which allows the RSound-CM20T to be used in humid environments and provides very low distortion with a 1 "silk dome" diffuser. The RSound-CM20T is ideal for both music and speech. The loudspeaker frame is made of high-quality ABS plastic. The RSound-CM20T can be connected to both 100V and low impedance audio amplifiers.