This DIY car subwoofer looks like solid marble stone but actually its a painted MDF. | Diy car, Car subwoofer, Marble stones
Amazon.com: Amosfun DIY 2-Way Speaker Box Terminal Binding Post Round Screw Cup Connector Subwoofer Plug (Black) : Electronics
5 Core 10" inch Full Range Subwoofer Car Audio Speakers High Power Bass Sub woofer Peak 850W DUAL 4 Ohm Car Vehicle Audio Full Range Drivers, Wide Range DIY Loudspeaker Woofer Replacement