The Eminence Beta 15A Subwoofer Speaker is recommended for professional audio as a woofer in sealed and vented enclosures. Eminence recommends the Beta 15A as a replacement speaker for the Nady FWA15 speaker cabinet, and as an alternative to the Eminence Alpha 15A for the Kustom KPC15M & KPC215H, and the Eminence Deltalite II 2515 for the Peavey PR15P speaker cabinets.Impedance: 8 ohms Usable Frequency Range: 45Hz - 3.7kHz Magnet weight: 34 oz. Power rating: 300W Voice coil diameter: 2", 50.8mm