Hi everyone. New here to AVS and hoping to get some advice. I have a new Pionere sc-37 and have spent much of the afternoon setting it up. Sounds great through my BD player. However, when I populate the net two HDMI ports with a Roku and a Popcorn hour, there is a loud hum that is present when ever there is any output at all to the speakers. Even in test mode. Is there a way around this rather than disconnecting the components? Thanks in advance.