B2 SubwooferThe B2 is a powerful double band pass subwoofer from d&b audiotechnik's heritage line. This professional grade subwoofer delivers exceptional low frequency performance for demanding audio applications. Key Features: Double band pass design for superior bass reproduction Dual 18" drivers for powerful low end response Impressive maximum SPL of 139 dB Part of d&b audiotechnik's respected heritage collection Professional grade construction and reliability