Features 8" High Efficiency 2-way Loudspeaker 1.5" High Output Til Midrange Voice Coil Rear Mounted 1" Aluminum Compression Style Tweeter Element Rated Glass Fiber Cone with Cloth Surround Protective Grill Included Weather Resistant Sold in pairs Specifications Dynamic Power Handling: 550 watts Nominal Power Handling: 275 watts Frequency Response: 90Hz - 18KHz Impedance: 4Ω Sensitivity: 92.8 dB DIMENSIONS Overall Diameter: 8.52"/ 216.6 mm Mounting Depth: 3.62"/ 92 mm Cutout Diameter: 7.22"/ 183.