15" Paper Cone Woofer Low cost general replacement woofer is ideal in a two way cabinets or as a subwoofer. It is perfect for prosound applications and is ideal in sealed enclosures. General Specifications: Nominal Diameter: 15 inch Rated Impedance: 8 ohms Operating Bandwidth: 30Hz ~ 2.5KHz Power Handling Capacity: 500W RMS Sensitivity (1W/M): 98 dB Voice Coil Diameter: 4 inch Overall frame diameter: 15.27" Thiele-Small Parameters: Resonance Frequency Fs: 43-57 Hz DC Resistance Re: 6.5ohm Mechanical Q Factor Qms: 2.8939 Electrical Q Factor Qes: 0.554 Total Q Factor Qts: 0.4648 Equivalent Cas air load Vas: 127.52 liters Efficiency bandwith product EBP 93-73 Voice Coil Over Hang X-max 7mm Physical Information: Cutout: 14.17"