D-vhs tapes do not play back in 5.1 only pro-logic. This problem has just started, previously I was able to playback thx surround ex[5.1], but recently lost that ability. The problem occurs on all my d-vhs tapes.
I checked the jvc and it is set to dolby digital, not pcm. I have tried cleaning the jvc with their head cleaner still no change.
If you are viewing the Samsung sound is coming from the Samsung optical out and you are getting 5.1 ok.
If you are viewing the JVC sound is coming from the JVC optical out and you don't get 5.1.
If you are viewing the Samsung and playing a tape on the JVC then sound is coming from the Samsung optical output and you get 5.1 on things you have recorded (but not for D-Theater).
If this is what is happening then it sounds like the optical connection between the JVC and the Denon is not working, and the Denon is defaulting to the AV connection. Unplug the JVC's optical connection at the Denon and see if red light is coming out of it (JVC has to be on). Look for kinks in the cable. Optical cables are fragile. Also check the Audio Mode on the JVC. It's controlled by a button near the top of the remote. For DVHS tapes it cycles between surround and two forms of mono.
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