btw title said DP34
whenever i install a dp44 i try to keep port one clear of any receivers, in other words only install the power inserter there, from past experience if a diplexer is on the same line it might go bad " too much power going through the dc pass " if i had to install somthing id keep it for a 311 or legacy receiver as far as the power inserter acting as a dp adaptor not true with DPPLUS parts you dont need a dp adaptor like a dpplus lnb as long as nothing is conected to the ext lnb input
in the dp44 case what i would do is connect only 110 , 119 and then run the check switvh on the legacy reciever, you will see the recervier will give you 110 odd | 110 even | 119 odd | 119 even switch detected sw64 and then conect the other two satellites but do not run another check switch cuz u will mess it up
from what i tried it works perfectly