Something is wrong if you have your sub turned "all the way up" at normal listening levels. Either you are using an A/V receiver with separate bass level control (set too low) or you've blown a fuse in the sub and think it is still working (but it isn't). Check it out.
JL Audio e112 sub vs. JL Audio Fathom 112 v.2
I recently purchased a JL Audio e112 subwoofer, which seems to work OK with my system, although at normal listening volumes it is turned all the way up. I wonder if for not too much more money it would not make sense to purchase a Fathom 112 v.2. Does anyone have experience with these subwoofers?