TorinTPG

I recently purchased a Klipsch Cinema 600 as an upgrade to my older Klipsch RSB-11. I'm loving it so far! I came across an issue that I wonder if others have had. I'm not sure if this is an issue with my TV or with the internal processing of the soundbar itself. While playing a 5.1 or 7.1 source via Plex, the side right and rear right surrounds sound very muffled and no sound comes out of the right channel at all. The left side and left rear surround channels play fine and the SB just upmixes them to the front left channel as it should (note - I do not have the optional satellites). It sounds like the SB it trying to play through the optional satellite speaker for the right channels, but I do not have these installed. The muffled sound appears to be coming from the subwoofer hitting on the higher end of it's frequency response. This happens when I have TV set to Bitstream and Dolby Digital processing. I can change the TV setting to PCM and it fixes the issue above, but then I get no discrete LFE at all out of the subwoofer. I've tried this on both my ATV4K and Shield TV. I've also tried with an optical connection from the TV to the SB. The channels play correctly, but no sub volume via the LFE channel with any settings. I've tried forcing the ATV to 5.1 Dolby Digital instead of the auto settings - no luck. I've tried several audio formats including TrueHD 7.1 and DTS-HD MA 7.1 - no luck. I factory reset the soundbar - no luck. Has anyone else had issues with this? This did not happen with the older RSB-11 (2.1 soundbar) and things worked fine. Is this a firmware issue with the SB? Maybe some weird incompatibility with my TV? Am I missing something really obvious? Setup is: - Apple TV 4K + Shield TV - Samsung 4K TV (2017 model) - Klipsch Cinema 600 - SB is connected via ARC to the TV - Running newest firmware according to the Klipsch Connect app