Just bought a very nice blue-ray player (Samsung BD-J5100/ZA) that has HDMI and (coax)"digital-audio" outputs only. Very nice when we want to watch video, but we also want to play audio CD's through our old analog-only stereo receiver. Obviously, that requires some kind of digital-to-analog converter. Owners' manual says the digital output will be "PCM 2 ch", what else do I need to know when choosing a converter?