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Originally Posted by zachman54
I have tried to determine if the optical cable and the optical port was good or not by changing the cable and connecting it to the TV/SAC port but got the same thing. Audio start correctly with Blue lamp on and a multi-channel signal but as the audio plays the sound continually dropoff and on to the point it's unwatchable. I have read on other sites that it might have something to do with the rate the Blu-ray sends the signal. Now I know there are differnent settings on the Blu-ray related to Linear PCM and differnet rates like 44 kHz and 88kHz and 176 kHz etc. But when I use any Linear PCM setting all I get is stereo signal. I have to set it to bitstream to get a multi-channel signal (blue lamp). Anyway it's not the cable and not the port. It has something to do with the signal speed. I think.
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I already told you the DD rate is 640K for Bluray. Try a bluray disc with DTS sound track. The DTS bitrate support is the same for DVD and Bluray.
Time to call SONY about your receiver or buy a new receiver. Two channel PCM is the most channel of PCM that optical SPDIF supports. You can get a receiver for about $350 with all the latest HD audio support like DTS-MA, Dolby TrueHD.