Subwoofer reccomendations for B&W 805S?


My room is 17x15. How big of a sub should I need? Does anyone have any good reccomendations?
nemesis1218
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Also, my neighbors house is pretty close to my house. What should I be looking for sub-wise if I don't want to disturb them? I have heard less distortion and cleaner bass is less disturbing and boomy. So would a REL sub such as the Stadium III be perfect? Or should I look at something else?