I set up my Focal home entertainment system to my Sony DA5400ES receiver and I have output from every speaker except the subwoofer. All I can hear is a light humming from the speaker no matter what settings I change on the receiver. My sub is connected to the receiver subwoofer output using a Monster subwoofer cable. I also noticed that i am unable to see the LFE signal from the receiver anymore. The only time I can hear audio from the subwoofer is if I connect an outside source (i phone or CD player) using the red and white connector. Not sure what else to try.