So, I have a goal of building 2 subwoofers for our family room... I listen to a lot of music, so fidelity is important. We also watch movies, tv, etc... and these will be hooked up to a 7.2 surround system. I was hoping to do one sealed enclosure for the front of the room (don't have a lot of space, but could do a small ported), and one ported for the back corner of the room. I know this is a silly question, but what are overall impressions of the Ultimax vs Titanic MK IV for sealed vs ported, and for fidelity, but still low bass. FYI, I am using (because I have them) 2 Dayton 500 Watt plate amps. So, that is another limitation perhaps??? Anyhow, any input at all would be greatly appreciated. Thanks in advance! Oh, yeah, and 12" driver is ideal for me.