There is an item called a separator (not a splitter) that should come with your receiver. You need one coax/receiver all the way from the last switch (in this case inside your 1000.4 EA LNB assembly) to each receiver.
Hmm....Let me see if I have this straight. The 3 lines of RG6 from the LNB goes to the DPP44 switch then the 1 RG6 line goes inside to a separator that hooks the the back of the receiver? correct?