JBL BassPro Hub | 11" (279mm) Spare tire subwoofer with built-in 200W RMS amplifier with remote control.
Build a Spare Tyre Sub - YouTube
Spare Tire Subwoofer Install (Non-Bose) | 2004 to 2020 Mazda 3 Forum and Mazdaspeed 3 Forums
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
Spare wheel Bose active subwoofer | By Japan Used Car Acceseries | Facebook
Car Bose Wheel Hub Spare Tire Subwoofer Loudspeaker Master Plug Connector With Wire For Mazda Infiniti - Cables, Adapters & Sockets - AliExpress
Replace Bose Subwoofers with Aftermarket Brand? | Page 2