Ryan, you have to post how to run the LFE through the mains!
Hmm... I wonder if I should be selling my up front subs instead of the 215's. This would give me a lot more space up front and could put the 215's in the corners to the sides of the screen where the subs currently are. I can't just set my AVR to no subs, because I would still be using my near field sub.
Here is a comparison, 1 215 speakers compared to 1 SI HT 18 sub:
Obviously with 4 SI's stacked I'd get 12 more db's than seen above, so I do have more output at most frequencies from the SI's than I do the 215's but not a ton more and actually I get more at 20hz from the 215's than I do the subs. I know this is with a crazy powerful amp, but it's the same amp with the SI subs, so apples to apples right?
I'm all about trying stuff out, so a couple days ago I moved the 215's behind my screen, each sitting next to the stack of subs. I set my screen on top of the speakers I was using for rear surrounds, perfect height for wedging the screen between the speakers it is sitting on and the beam on the upper left side of my ceiling so this shows me perfectly what it would be like to move the screen up and have the 215's behind the screen.
The screen is just too close. It's now 9 feet from my eyes. 2:35:1 is 158 inches diagonal and 16:9 is 128 diagonal. Too close.
I ran Dirac and the sound is very good with the speakers behind the screen for movies. Watched Goosebumps last night with the family and I like it better this way with the mains not so wide. Need to do some listening for music.