SpeakerCraft's Whole House Audio in-wall and in-ceiling speakers offer high performance and great appearance at a surprisingly affordable price. Every model uses components usually found only in architectural speakers costing considerably more. Features: 6-1/2" Polypropylene Cone Woofer with Rubber Surround 1/2" Liquid Cooled Polyamide Dome Tweeter Specifications: Efficiency: 90dB 1W/1m Power Recommendations: 5 - 50 watts (undistorted) Impedance: 8 OHMS Frequency Response: 60Hz - 15kHz ±2dB Diameter x Depth: 9-13/16" x 3-1/2" Cut-Out Diameter: 8-1/4"