6-½" Coaxial Waterproof Speaker Key Features: Max power handling: 120W/Pair Sensitivity: 91dB Frequency response: 75Hz - 20kHz Nominal impedance: 4 Ohms Polypropylene woofer: 6-½" Magnet: 9.8oz Mounting hole diamater: 5" Mounting depth: 2-1/3" Tweeter type: Dome Tweeter material: Titanium One-piece plastic chassis with integrated drip-edge Voice coil size: 1" Suspension/surround: Rubber