TiVo XL via HDMI to a soundbar. My soundbar supports 5.1 DD. Unfortunately, I get a pop / crackle / annoying sound when DD is enabled, when I start viewing a recording, come back from a menu etc. How can I verify how many channels are being output over HDMI, when using DD to PCM conversion setting? Is it a discrete 5.1 channels, or is it downmixed to two channels? There is no indicator on the soundbar / subwoofer telling me how many channels are being input.