JBL GX Series 12" Single-Voice-Coil 4-Ohm Subwoofer Black GX1200 - Best Buy
Amazon.com: EMB Professional 12" 1200W SB-12 Replacement Speaker for JBL, Peavey, Cerwin Vega, Gemini, EMB, BMB, Pyle-Pro, Mr.DJ & Many Brands! Protects the woofer and speaker in open installations.
JBL By Harman GT-X1200 Car Subwoofer Speaker | 1200W -Hi-Res World