W12GTI II | 12 inch Differential Drive Design Subwoofer
Amazon.com: LAB SlapBox 2.00 ft³ Ported/Vented MDF Sub Woofer Enclosure Box for Single JBL 12" GTI MkII (W12GTi MkII) Car Subwoofer | ¾ Premium MDF with 1" MDF Front Baffle | Made
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JBL W12GTI Subwoofers user reviews : 4.6 out of 5 - 1 reviews - carreview.com