Recommended for professional bass guitar applications in a sealed or vented enclosure Copper coil on Polyimide former Die-cast aluminum basket Vented and extended core Paper cone with cloth cone edge * Power handling: 300 watts RMS VCdia: 2.5"Impedance: 8 ohms Frequency range: 47-3,000 Hz * Sensitivity: 98 dB 1W/1m FS: 34 Hz Magnet weight: 80 ounce Dimensions: Overall diameter: 15.21", Cutout diameter: 14", Depth: 6.5".