Focal K2 Power M SUB 5 KM M Profile Sandwich Cone 5.75 Inch Subwoofer 200w RMSK2 POWER SUB 5 KM THE K2 SOUND SIGNATURE 5 3 4 (145MM) SUBWOOFER Like all the speaker drivers in the K2 Power M range, the 5 3 4 (145mm) subwoofer 5 KM is fitted with Focal's iconic aramid fibre K2 sandwich cone. And for an even bigger performance, Focal's engineers have combined it with their famous M profile. This shape of cone offers better frequency response and better sound dispersion, and reduces speaker driver depth. Attributes that go hand in