I upgraded a guy a couple of weeks ago from a Spaun 4x8 switch to a Spaun 4x16. He had 4 dual tuner tivos & 3 single tuner tivos w/some of the tivos obviously short feeds. We wer'e adding another dual tuner tivo & needed to have enough for all & future use as well. I have pretty much no experience with dtv configs & called Spaun & they hooked me up. A**D had one in stock & away we went. Dumb luck it all worked out?