I have a Panasonic DVD player connected to a Yamaha amp (sorry, don't have access to the actual model numbers right now) which was working fine all this while. However I haven't been able to get a DTS signal on my amp lately. Prior to this, I have always been able to choose between Dolby Digital 5.1 and DTS 5.1 within my DVD language settings which will automatically be reflected on my amp (the DD/DTS light will come on). Now, when I choose the language settings, the options have changed to DD 2.1 and DTS 2.1 instead! Even then, when I choose DTS 2.1, the DTS light doesn't appear on my amp (it remains at DD, which is always lit up by default anyway). My guess is that somehow, the amp is only receiving an analog signal. Is it possible that only the DTS decoder is malfunctioning within my amp? I use a coaxial cable and I don't have a chance to test an optical connection out cos my player doesn't have a corresponding output. My DVD player is set to bitstream output so there shouldn't be a problem there.