Turbosound TCS-215 Dual 15" Passive Subwoofer CG01ZKA

Martin Audio WS218X Dual 18" Passive Subwoofer Speaker System CG01ZPE

Martin Audio WS218X Dual 18" Passive Subwoofer Speaker System CG01ZPD

Meyer Sound M3D-SUB Active Directional Cardioid Subwoofer CG01ZN4

Meyer Sound M3D-SUB Active Directional Cardioid Subwoofer CG01ZN2

Meyer Sound M3D-SUB Active Directional Cardioid Subwoofer CG01ZNX

Meyer Sound M3D-SUB Active Directional Cardioid Subwoofer CG01ZNZ

Meyer Sound M3D-SUB Active Directional Cardioid Subwoofer CG01ZN0