I think most of us members have seen the pictures of the "worlds largest subwoofer" where a bloke digs a massive hole in his floor. For 99.9% of us very interesting but totally impractical. So, what, in the real world, is the biggest, baddest, nosiest most neighbour unfriendly sub I can walk into a shop and buy ? I'm in the market for a new sub after Xmas and looking seriously at the Kef 4000 or maybe 5000, but how bad could I be !!!!