Hey guys. Thanks for the comments and the encouragement. I'm not
brave. I just thought that people would want to know how they compare.
I will do my best to be fair and unbiased, but so far I can say that
both the Submersive and the dual Empires are AMAZING. They both
seem really well designed and engineered subs. They sound tight, clean and
they've got great low end output. I don't think that there will be a
"loser" in my review regardless of the results. They both blow away my
old DD-15 and cost less so I am already happy.
I am currently trying to get REW up and running to try to get some
measurements. My old Velo had that fancy built-in room EQ system, so
this might take some time to set up and get used to. I am ordering all
kinds of little adaptors and wires so I hope it actually works. I am
also trying to get TrueRTA up and running for some SPL tests during
movies. I might lose my patience before then, but I will try.

Moving the subs in and out of the listening room for A/B testing is
already trying my patience, but I think the results will be worth it.
I'll try to get some pictures up soon too.