The legendary Solo-Baric L7 Subwoofer maintains the throne as the first and foremost authority on bass. Square? You bet! KICKER wrote the book on it, and then patented it. Solo-Baric is the only patented square subwoofer on Earth - more cone, more air, more decibels. KICKER´s knack for extraordinary bass is evident. The L7 motor structure contains dual high-temp voice coils, a poly-cotton semi-progressive spider (two in the colossal S15L7!), jacketed braided tinsel leads, highly-efficient UniPlate pole piece/back plate, and a heat-reducing T-cut top plate for outstanding toughness and enormous power handling. The cast aluminum basket yields a super-sealing, rear foam gasket and spring-loaded terminals. A shielding front gasket helps to protect the wide Santoprene surround.