In the audio setup for my digital cable box it has settings for high compression, low compression, and none. I was reading that it says to set to high compression if it is going to be hooked up to a reciever with Dolby capapbilites. Does this seem right? It seems to me that you would want the least amount of compression possible. It also says to set it on stereo matrix if it is hooked up to a dynamic stereo system. The other choices are stereo or mono. I am just trying to get the right settings. My cable box does have the s video and digital coax outs. And it is hooked up to a keenwood VR 507 reciever. I am wondering if I have the settings correct because on the premium channels I get a digital signal but my dolby digital light never comes on. it just uses PLII. I know not all movies are dolby digial 5.1 but mine has never come on.