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The spare wheel well in most sedans, hatchbacks, and SUVs sits below the trunk floor and goes unused unless you have a flat. A spare tire subwoofer replaces or sits inside that space with a purpose-built enclosure and driver. Once installed, the trunk mat lays flat over it — the installation is completely hidden and the cargo area stays fully usable.
Most spare tire subwoofers are powered — the amplifier is built into the unit, which simplifies wiring and eliminates the need to find a separate mounting location for an external amp. Passive options exist for builders who want to match their own amplifier, but for most applications the powered all-in-one format is the cleaner install.
Fitment is the only variable that matters before anything else. Measure the inner diameter of your spare wheel and the depth of the well from the floor to the underside of the trunk mat. The subwoofer needs to sit below the trunk floor level — if it doesn't fit flat, the trunk mat won't close correctly. Confirm both dimensions against the product specs before ordering.
If you get a flat, you'll need to remove the subwoofer to access the spare. Most powered units are held in place with a single retaining bolt and use quick-disconnect wiring — removal takes a few minutes. Factor this into your decision if you drive in conditions where a flat is a realistic scenario.
Powered spare tire subs accept either RCA line-level input from an aftermarket head unit or high-level speaker input for factory radio integration. Confirm which input your head unit supports before wiring.
The FEM Audio STS-F12 is a 12-inch powered spare tire subwoofer — driver, enclosure, and amplifier in a single unit designed to drop into a standard spare wheel well. It includes a wired remote bass control for level adjustment from the driver's seat and accepts both RCA and high-level inputs for factory or aftermarket head unit compatibility.
Currently available as a closeout at 22% off retail — one unit remaining. View the FEM Audio STS-F12.
Looking for more subwoofer options? Browse the full car subwoofers collection to compare all formats and sizes.
Spare Tire Subwoofers
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