My house has 2 zones for audio. One is an exterior zone with 2 Triad OD25 speakers and the other zone is an interior zone that will use 4 in-ceiling speakers and an in-ceiling sub. This indoor zone is located in the living room and will not be split into different zones. We do not plan on adding additional zones in the future. That being said, we only need two audio streams at most, which means I only need an EA-3. We only plan on using Pandora, Spotify or our iPhones for music. If I acquire a Triad TS-PAMP8, do I need to have the TS-PAMS-8 matrix to make this work, or does the Triad amp work with the EA-3? The EA-3 does not have any RCA connections, so I don't see how a physical connection is made.