Part 3: Reverse mount vs normal mode subwoofer setting - YouTube
can someone show me an inverted sub? | Car Audio Forum
subs- to invert or not to invert | DIYMobileAudio.com Car Stereo Forum
Ymiko 4pcs Speaker Basin Stand Reverse Subwoofer Basin Bracket Repair Parts For 8 Inch Speakers,Subwoofer Basin Bracket,Reverse Speaker Basin Stand - Walmart.com