I have just finished installing a home theatre 6.1 system using a Yamaha 1300 receiver. I have Bright House digital cable coming to their Scientific Atlanta 800 PVR/cable box. The PVR/cable box has coaxial digital audio output which Scientific America web site says to connect to a Doby Digital receiver. I have used a coaxial cable to connect to one of the coaxial in plugs of the receiver. I have set the speaker delays and adjusted the speaker volumes to be approximately equal using the test tones in the receiver. That seemed to work O.K. However, when I listen to something thru my PVR/cable box I do not receive any significant output from the surrounds and rear speaker. I can get sound from either the 2 fronts plus sub or from the center speaker. If I walk over to the surround and rear speakers I can faintly hear the sound. I have tried several different movies and several different music channels all with the same result. My interest is in listening primarily to what I receive on digital TV cable not in renting a bunch of DVDs. Have I just blown $2000 on a system that will produce only stereo sound? I had planned on buying the Digital Video Essentials disk and the Radio Shack meter but now I am wondering if I am just pouring money down a rat hole. If you have any remedies or suggestion please, please share them with me. At this point I am awfully tired and disillusioned.