You have to move the sub around to get it right...walls and corners can be your friend in what you hear at your listening spot, and a single sub works in MY room because I'm lucky. Dr. Earl Geddes claims (more or less) that one's taste (or opinion on bass quality) needs to be ignored until supported by test data. This is why I don't have him over anymore. That, and he keeps staring at Shirley. In the time it takes to read through white papers and well thought out science backed opinion, you could have moved your sub around a little, adjusted its level, and started having fun.