... . Frequency response: (3dB )60Hz~400Hz Q-25B High power dual 15 inch subwoofer 1.Q-25B is a kind of 2x15" speakers ... DISCO, outdoor performance, stadium, club and other public places.dual 15-inch subwoofer 15 inch subwoofers with box pro audio , professioanl loudspeaker , loudspeaker , speaker ... )WeightNet:52Kg Q-25B Structure Q-25B High power dual 15 inch subwoofer