KSC-W1200B Box-Type Passive Subwoofer Features: Non-ported subwoofer box 300mm speaker 1200W Peak input power Compact size cabinet Two colour embroidery Easy to install and remove by quick-relase belts Specifications: Peak Input Power 1200W Rated Input Power 300W Woofer Cone material P.P. Cone Speaker Basket SPCC Speaker Surround Rubber Sensitivity 84dB/W/m Frequency Response 38Hz ~ 300Hz Speaker Impedance 4Ω