Amazon.com: Mackie S Series S518s 1800-Watt 18-Inch Passive Subwoofer, Black : Musical Instruments
Amazon.com: Brand New 1x EMB CB-18 2000W 18" 8-Ohm Replacement Speaker for JBL,Yamaha,Cerwin,Peavey - 8-Ohms Features Full Range Design - Frequency Response: 40 - 2,800Hz : Musical Instruments
Yamaha SW115V Club Series V Subwoofer : Musical Instruments