My quest for low end bass that is affordable land me here in DIY. I am looking to spend about $500 to $600 bucks. i am looking at building either a sonotube or boxed sub. i am looking for that low bass that plays load below 20htz. I am looking to build two or one subs. my room is 17 X 25. i sit about 13' from my center channel. I have been reading that most low end subs do not have good mid bass and most that handle good mid bass do not have good low end. Would it make sence to build one of each? I have been looking at Rythmic subs for my build. My build will be for 90%HT and 10%music. Please let me know if you have any other ideas thanks.