I currently have an Emotiva umc 200 with a Crown XTI 4002 amp. Looking for 2 subs to go into a dedicated HT. I was looking at the Dayton 18 ho, Dayton um 18, and SI HT 18. Needing help in deciding which ones would perform the best in the 4cft seald flat packs from DIY sound group? Also, which one would preform the best in the Stonehenge flat pack from DIY sound group? Now, would you go seald or ported? Oh, don't know if this would help, but I have the Fusion 12s for the front stage and the Fusion 10 pures for the rears. My room is 9ft tall by 9ft wide by 18.5ft long.