Proficient C610 6-1/2" Ceiling Speakers - C610, offers a 6-1/2 " polypropylene driver and high-profile soft-dome tweeter for an optimum blend of bass, midrange and high frequency response. Design: 2-Way coaxial in-ceiling Tweeter: Pivoting 1” soft dome Woofer: 6.5” polypropylene cone with butyl r and more Home HiFi Systems