SI SQL D4 carbon 12" In custom ported box (28hz tune) mint cond. | DIYMobileAudio.com Car Stereo Forum
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Custom Box Ported or Sealed Enclosure MDF or Plywood Box Speaker Subwoofer Enclosure Any Sizes Custom Cut. - Etsy
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Custom Subwoofer or Speaker Box Kit Enclosure Unfinished, Unassembled, MDF or Plywood. Custom Made . - Etsy
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