Yes, I have dual subs mated to my 1SC's. Room is 12x16 and heavily treated. I had a single sub but found it lacking so I went dual. Great sound.
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Since your spekaers are rated down to 30Hz, I wonder how much difference it would make. That is, you might not want to blend in the sub any higher than that, so there may not be noticeable improvement.
That said, mine go to 40Hz (in a larger room than you describe) and I think there's a tremendous difference. See if you can get a loaner and give it a whirl, what's to lose?