If you do not need the Slimline 5 there is no reason to have to get signals from them and possibly cause a problem. Copied and pasted from an earlier post. Incidentally... as noted earlier, I have four (4) wires running from the current setup and because of that I can't have all the DVRs working. I guess I could run a 2nd line to the 2nd floor bedroom DVR, and could I run a single line down to some kind of splitter/multiswitch so the two "ground level" dvrs could get two (2) feeds each? Is that possible? If you change to SL3 and also get the SWM version it will control 8 tuners ( dvrs have 2 each ) with only one wire to each of them. If you change to this it will also require a 21 volt Power Inserter. Your mix of receiver model numbers is not a problem.