I had a DIY 85l shiva and then went smaller to a Earthquake 10" subwoofer. Now I decided I really need a 15" subwoofer. I have an Adcom GFA-555 to power the sub. I also have a very well made 85L Shiva enclosure I would like to use. I have been considering the 15" Titanic. Would the Titanic work well in a downfiring selaed 85L enclosure? Would the Adcom amp be enough without the PEQ that the Dayton 1000watt plate amp offers? How would this work? Any help is greatly appreciated. Also, any other 15" options that would work in this enclosure? I can run another port or keep it sealed.