MF-1021 single 10" middle and high range speaker, use big power good qulity unit, big horn load, long distance, strong penetrate, middle frequncey smooth and clear, wide coverage, it can be hung as array . MB1018 single 18" subwoofer,strong power, big long horn, far distance, low frequncey full and strong. Applicable to large scale sound reinforce system and road performace. The slot on the speaker can install fast and safe pro audio loudspeaker speaker MF 1021(Specifications)(System)1x10"+1x3"(MF&HF)(Power)H:150W/M:300W(Frequency response)200Hz 16KHz(Sensitivity)100dB(Input impedance)8Ω(Cover range)75°X30°(Crossover)HI/MID:1.5KHz(Max SPL)131dB(Dimension)688F/360Rx400x754(mm)(Weight)Net:60KgMB 1018(Specifications)(System)1x18"(Ultra LF)(Power)800W(Frequency response)45Hz 200Hz(Sensitivity)105dB(Input impedance)8Ω(Cover range)No(Max SPL)131dB(Dimension)688F/360Rx800x754(mm)(Weight)Net:69Kg.