That's my thinking as well. AFAIK, you CAN use a DP34 after a DP+44. However, you HAVE to make sure the power inserter is plugged into the DP+44 to use the DP34. DId the installer even try to hook it up? At the very least, swapping out 2 of your DP34s for anther DP+44 and 4 seperators would be able the same $$. If nothing else, he could just use 2 DP21s connected to the 2 ports of the 921, since it is the ONLY HD receiver. Reference these guys to this forum and the Mad Scientist's thread about hooking up 5 locations. They added support for the DP34/DP21 cascade a while back.