Amazon.com: Skar Audio SK3X8V Triple 8" Universal Fit Ported Subwoofer Enclosure with Angled Rear Firing Design : Electronics
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Where should the port be installed on a vented enclosure?
Slot Port Centered Sub Up - NSFC | caraudiofabrication
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Qpower Qbass Dual 12 Inch Heavy Duty Mdf Material Car Audio Subwoofer Enclosure Boxes With Shared Slot Port Vent And Dual Chamber Design, Charcoal : Target
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Amazon.com: Q Power QBASS Dual 12 Inch Heavy Duty MDF Car Audio Subwoofer Enclosure Boxes with Shared Slot Port Vent and Dual Chamber Design, Charcoal (2 Pack) : Electronics
Ported box with angled back. | DIYMobileAudio.com Car Stereo Forum
slot port box - Members Gallery - SSA® Car Audio Forum