Hello. What's your budget? I say this b/c other than niles, the only other company that I know of that would put out some thump OUTDOORS is James Loudspeaker...and from my limited knowledge of the company, they are pricey....but you may get what you pay for. I just don't have any personal experience with them, or any outdoor sub for that matter. I can tell you they do make subs from 8 inch to 21 inches! for outdoor use. Check out their website when you can. How large of a space are you looking at? I am an extreme bass head and I didn't bother with outdoor subs, my def techs (AW6500's) provide adequate "DJ speaker sound" from 50+ yards away. To give you an idea, I have 4 10 inch polk subs (in ceiling) in my 7.4 surround system dnstairs, 2 10 inch polk subs (in wall) in my game/bar room, and 2 JTR Orbit Shifters in my dedicated home theater. I don't want to talk you out of the outdoor subs (b/c I def. like the idea!), but just wanted to give you an idea of the sub volume I'm used to and I can def. say I don't miss any outdoors where I'm sure it is hard to get for the $ spent.