Just chiming in... Yes dual subs are my favorite as well. Placing one on the left and one on the right not only looks balanced, it fills the room more fully and you lose the source of the bass visually as it fills the room. ...Like the saying when speakers disappear, when I balanced with a second F113 it really made a difference. I threw in a F112 for kicks and even though it isn't properly balanced, it filled the room even more.
2 in the front and 2 in the rear should be even better, but of course you would have to play with it a bit. Measuring equipment is always best for true results vs placebo results but it shouldn't matter with the V1 / V2 models...
I know this is an older thread but I'm a bit passionate about Fathoms, so wanted to give what I could.
