Siri remote is not an universal remote. It is meant to provide all required functions while within the tvOS UI. Not control everything else.For those that say the Siri remote is the only one that they use now, how do you get it to change channels on the tv? It works the volume fine on my receiver, but I can't figure out how you change channels? Or do I actually have to use multiple remotes? Boo, if so.
That said, the new aTV can be controlled with your existing universal remote.