The sound prince sp series has a desirable high power capacity and clarity, as well as an exceptional low frequency output providing tight bass response all the way. for high frequency, a titanium diaphragm compression driver produces a powerful yet neutral sounding high end. this sp series speakers use new, specially developed lf & hf drive units acoustically matched with an equally durable cabinet. the finish is extremely hard wearing and is leagues above any other carpet covered cabinet in the same price point. features model: sp - 218 rated power: 1000w frequency response: 35hz - 450khz nominal impedance: 4ω sensitivity: 103db maximum spl: 127db system type: 2x18" subwoofer perform very natural, clear and soft sound on mid-high dimensions: (w\d\h)mm 1066 x 780 x 561.