Black 8 Inch Subwoofer, Size/Dimension: Box Size 19x19x10
RetroSound® Full-range Speaker System R-TB8 – Retro Manufacturing
Amazon.com: Atrend 8 inch Vented Enclosure Carpeted Car Subwoofer Speaker Box - Improves Audio Quality, Sound and Bass - High Grade MDF Construction with Nickel Finish Speaker Terminal - Black : Electronics