I'm running a coax cable from the Digital Audio Output Port on the C61K to a DAC that has a headphone out port. However, I can't get any sound out of it. Two questions: 1. Do I have to change a setting in the C61K to turn the Digital Audio Port on? 2. Is the signal strength for the port strong enough to drive headphones. These headphones work on the iPhone headphone out port which I doubt is very strong. Edit: Nevermind. Found answer on Amazon customer review. Had to change audio output to Standard Audio from Dolby Audio.