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To breadsc400 you actually can fit the 12w7 jl h.o box in the correct way with the speaker facing out like you had on ur ls400. I actually have the same sub in my sc3 when I 1st purchase the sub, I had it in the exact same way you did now in order to get it home. After getting home I played around with the fitment and found dat you'll need a 2nd person being that its about 140lb to help u to angle the box in it frm one side to the other. If u got any question feel free to ask.