L-ACOUSTICS SB28 High-Power Dual 18" inch Subwoofer - YouTube
New and Used SB28 Subwoofer for sale
SB28 Dual 18 Inch Direct Radiating Subwoofer - Buy Direct Radiating Subwoofer, SB28 subwoofer, dual 18 inch subwoofer Product on Sanway Professional Audio Equipment Co., Ltd.