Niles CM8MP (Ea) 8-Inch Two-way In-Ceiling Loudspeaker with Pivoting Tweeter (FG01661) Integrated Woofer/baffle Design Delivers Greater Low Frequency Response By Employing A 8" Woofer Where Competitive Models Of The Same Outer Size Employ 6 1/2" Woofers Polypropylene Cone Is Light, Strong And Well Damped To Provide "best In Class" Bass Response 1" Fluid-cooled UltraSilk Soft-dome Tweeter Provides For Clear And Detailed High Frequency Response Proprietary Bridge-mounted Tweeter-adjustment Mechanism Focuses The High Frequency Sound In Any Direction Up To 20 Without Diffraction Single Speaker - Sold Individually - Purchase Two for a Pair.