The Kappa Pro 15B is a 15" professional series loudspeaker for professional audio in a vented mid-bass or bass enclosure, and is also suitable for bass guitar. Features 47Hz to 4kHz usable frequency range, 16ohms nominal impedance, 500W power handling and 100dB sensitivity. 1.59mH coil inductance, 80oz ferrite magnet and vented core. Solid composition paper dust cap, die-cast aluminum basket and copper voice coil.