AVS Special Member
Join Date: May 2007
Location: Taylorsville, UT
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What are the diplexers for? Your drawing does not indicate their purpose.
On the leg that has your cable modem, etc., you have ~11dB of splitter loss to both the VoIP box and that TV. Why not put the amp on the input of the first 2-way splitter.
Looking at it again, suspect that the diplexers are for MoCA to bypass the amp so it can continue to the other leg of the 2-way splitter. If you could locate the amp at the input of the 2-way splitter, you wouldn't need those diplexers, as well as increase the CATV signal to the other leg, where it appears you need it more.