I see quite a few people posting all the time that there is no such thing as fast or tight bass. They say that if a subwoofer sounds slow, then it's just because of the room set up. While I certainly believe that room set up, frequency response, and harmonic distortion are important factors in subwoofer performance, I also believe there is more to it than just that. For example, how fast can the movement of the woofer start and stop? What about ported vs sealed? What are your thoughts on this subject?