Joe, there is no obvious answer. Once again, I would expect you are using a cheap stereo splitter that is passive, and you are getting signal loss across things, perhaps cheap (poorly built) cables.
Just an FYI: The yellow RCA connection is composite video. The Red/Green/Blue RCA connection is component video. RCA is the physical connectors that plug into the two video types. But, the two video types themselves are called composite and component video. The red/white RCA connections (once again, RCA connectors!) are your analog audio connection point.
As far as I can tell all Sonicview FTA receivers only have one set of analog audio outputs, so you will need decent analog cables if you want to use them, and once again, you may need a powered analog audio splitter to get what you want.