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How would I install a subwoofer in my '09 xB with the base radio in it. What adapters would I need and where would I put them? I've installed a sub and amp before with two of my friends, but it was on an aftermarket head unit that had a place for a sub already. I'd like to keep my stock HU if at all possible for now (upgrading later is always an option!), because I like how it matches everything else, doesn't have a bunch of confusing menus, and doesn't attract thieves. Any help is greatly appreciated!