I am surprised that you need subs with the Signature SEs as well, like others mentioned. My step father has those in his finished basement (large) and they fill the space perfectly with a Rega Elicit Mk4. I have the Legacy Studio HDs, and use a REL T5i, which I recommend for size and also their wireless transmitter! My space is very limited and awkward for placement of everything, so putting the sub, "somewhere" was really the only option. The wireless transmitter delivers the HI LEVEL signal and is pretty much identical to the wired hook up....only you can put it anywhere you want, or need for dealing with nulls, or placing "in the only spot you can put it!" like my set up.
Best of luck and let us know what you come up with.