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Hi Guys, I am planning to replace my subs. I hope you guys can give me some feedback. My home theater room is 5x7x3M, I am using 4x Rockford fosgate T1D215 (150L port 18hz), with crest audio 8001. I am pretty happy with them to watch movies and critical listening to music. Lately I have been looking to upgrade my subs, as it is only reach around 24hz flat (+10db from main, roll off to 0db at around 15hz), I need more low extension!! I have been looking at SI H2-24! I watch some review and measurement, it looks good. After some more conversation with other people, someone mention that SI is only good at ULF for movies, but not so much at midbass quality for music. What is your take on that? I attach some simulation as follow: Green: Rockford T1D215, 150L vented at 18hz Blue: SI HS-24, sealed 450L Red: Eminence NSW6021-6 vented 371L at 25hz, Brown: Rockford T3S1-19, 450L at 20hz. To my surprise, my current sub T1D215 seems to give the best freq response. I hope the simulation is correct as SI HS24 in the databass has different freq response. Right now what is the best driver out there that can satisfy music and movies lover? Any suggestion? I can do up to 15cuf/450L for enclosure. I am leaning toward SI HS-24 to be honest. I just want to confirm with people who has them, do u like them for music? Does it have good SQ in the midbass such as transient, focus, clarity/transparency. When watching movies, usually I running at 100db for main, that is loud enough. For music slightly below that around 95db. So the 4 subs, when running together I only need them to be around 110db, so each sub around 104db. Thank you all, hopefully I can get some good feedback here.