EM-1krms - EM Audio 18" Custom Hand Built Subwoofer (1000 watts) - EM Audio Subwoofers
Custom Fabrication Packages
Amazon.com: ALPHASONIK APP122 Complete 1500 Watts Dual 12" Subwoofers Car Bass Package with Amplifier and Installation Kit Included - 2 Sub Woofers with Grills in Custom Ported Box Loaded Enclosure, Black : Electronics
How to build - Wedge Subwoofer Box Enclosure! SIMPLE & LOUD!? - YouTube