DESC: The NILES CM5PR Performance ceiling-mount loudspeakers that complement its Performance in-wall models. Performance loudspeakers are known for their optimal value and superior sound quality. The new CM5PR utilize high-performance talc-filled polypropylene woofers for extra stiffness high BL motor structures and Kaladex tweeters mounted in custom pivoting enclosures. The CM5PR features a 5-1/4 woofer. CM Performance loudspeakers feature baffle-mounted tone controls for bass and treble which enable the installer to adjust the sound to compensate for speaker placement and room acoustics. The speakers also feature a convenient jumper on the speakers circuit board which can be set for either 4 or 8 ohms speaker installations. 4- or 8-ohm selectable impedance.