the basic answer is no OP, you can run a swm8 lnb (not multiswith) into a power inserter, then into a 1x8 splitter, then 8 d12s, H20s, H21, H23, H24, H25, HR20, HR21, HR22, HR23, HR24, HR34s or any combination of those receivers, keeping in mind the 2 tuner to a dvr limitation you are aware of. I do not think you can set a single tuner dvr on swm, because when the box sees swm, it automatically selects dual, and i believe single is greyed out in the tuner space. Now what I can tell you from experience is if you were to connect a 9th tuner, it would work so long as one of the other tuners is not in use. Or at least it did 3years ago when I was a tech. So IN THEORY if you had 8 dvrs on a swm lnb, and no1 recorded anything, they should all work. I make no guarantees however. But Im with raoul... I wouldnt want anything to do with the wiring nightmare your going to see with drunks about lol.