When it Comes to Subwoofer Specifications, Some Numbers Don't Matter
Tire Well Subwoofer (Work in Progress, so don't judge me yet :-) | Pontiac G8 Forum
Don Lindich's Sound Advice: Ditch the subwoofer? Not every sound system needs one | Pittsburgh Post-Gazette
Car Vehicle Subwoofer Audio Speaker - 12 Inch Blue Injection Molded Cone, Blue 68888876100 | eBay
The Complete Guide to Subwoofers | KEF Europe
nemesis audio 33 inch subwoofer (ask for price ) please don't tx if you don't have 2k plus cash - Electronics & Computers - Fort Worth, Texas | Facebook Marketplace | Facebook
For those of you who want more bass but don't want to sacrifice your spare tire or hatch space, I highly recommend this spare tire mount subwoofer : r/GolfGTI