Pt-210 12 Inch 100 Mm Foam Edge Subwoofer Speaker Carbon Fiber Paper Cone 220 Magnetic Dual Magnetic 800-1600w 4/8ohm - Home Theater Amplifiers - AliExpress
Amazon.com: uxcell 100mm x 160mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box Port Tube Vent : Electronics