Pioneer S-IC621D Custom Series 6.5-Inch Circular In-Ceiling Speaker (Single) (Discontinued by Manufacturer) 6.5-Inch In-Ceiling Dual Voice Coil Speaker 1-Inch-Inch Pivoting Soft Dome Tweeter Polypropylene Woofer 3-Position Treble Contour Control 6.5-Inch In-Ceiling Dual Voice Coil Speaker 1-Inch-Inch Pivoting Soft Dome Tweeter Polypropolene Woofer 3-Position Treble Contour Control Phase Control Design and Thermal Resetting Protection Circuit and Humidity Resistant Single-Point Stereo