I am looking for a subwoofer to replace my aging Polk Audio PSW505. I'm not looking for the most powerful sub, honestly my Polk has enough power but it's showing its age. I'm after a sub with tight bass, that drops off as fast as it hits. I will most likely get an SVS but I'm having difficulties picking the right one. Also where I live volume is an issue. I will be watching a lot of movies at low/med volume and still want tight bass that can be heard and felt at lower volume levels. During the day I listen to a lot of music, very loud. So I guess I want the best of both worlds. Tight quick bass at lower volume and big bass at higher volumes. Any input on which subwoofer would suit me best is greatly appreciated