The RC71/RC72/RC73 is a newer DirecTV remote that only controls the DirecTV box and the TV, but there should be a way for you to program an audio device, since I have had a couple of DirecTV customer's with the RC71 and the RC72 and they were able to call up ZVOX as a brand for controlling the volume for an audio device.
Go to Menu, Setting & Help, Settings, Remote Control, Program Remote, Pair/Program Audio Device, Select Make, and Find Model Number check code using volume up then select IT WORKED!, Remote should now be programmed, select Use Audio Device. On and Off function doesn't always work with every Audio Device.
You can enter either ZVOX model 555 or 580 and that will work. If it does not work Go To: Select Volume Control - Audio device (system).