JL Audio e112 sub vs. JL Audio Fathom 112 v.2

I think I misled everyone:  the volume of the e112 is turned up about 3/4 of the way, rather than all the way up.  (I am fairly certain that the sub is behaving properly because after receiving it from the dealer I sent it back to get it checked out, and it was fine.  My listening room size is 23 feet (length) X 12.5 feet (width) X 8 feet (height). 

If you have efficient mains and a powerful amp that could be what is requiring you to use so much sub volume to keep up. I have 2 e112s in a 25x28" room and I run them at about 30% volume. 

James, I have custom-built Audience Wavemaster D-class monoblocks which are pretty powerful.  Please excuse my ignorance, but what are "mains"?  It would, of course, be less expensive for me to buy a second e112 than a new Fathom 112.v2, so if that would work well that sounds like a grand idea.  Glenn

Emailists,
My former Velodyne sub was a "Digital Drive" model, not a "DD+".  Before I purchased the JL Audio subs, I did audition a 15" DD+ sub woofer, but it was not setup well, sounded boomy, not well-defined.
I've been really happy with both my former Velodyne & my new JL Audio's, if anything the JL's seem to be "faster".

gapperis123: "Mains" means the power that comes out of your wall socket. What you plug your equipment into...