First off, I appreciate the input. I do understand the laws quite well, but that is not my concern. My original question was "is there a way to use the sub at a normal level without it thumping on the floor or walls? I think a very helpful suggestion was to buy a front firing sub or putting something underneath of it. It will be on carpet also. Anyhow, I am going to be buying a house in the next year and so worst case, I guess I will buy the sub and just not use it if it cannot be heard at a respectable level. Thanks to you all!