I don't know what your total budget is, but there are definitely options that will fit in the spare tire well. JL Audio is my go-to for subs; the TW3 and TW1 models are slim depth small box woofers that could do the trick in that area pretty easily. The only issue is you'd need a custom enclose and separate amp. This would blow the Bose sub out of the water, but definitely at a cost.
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