So I have an update. I bought a 48gbps HDMI 2.1 cable from monoprice and replaced the hdmi cable that came with the soundbar. I have 0 delay now and I didn't experience any audio cut out so far. So it seems to me the HDMI cable was the problem all along ?
... View more
There is a serious audio delay issue with the HDMI 2.1 port or anything you want to pass Dolby Atmos through the eArc port with a Samsung Soundbar. It took me a while to troubleshoot and find the root cause on my Samsung Q90t and SAmsung HW-Q70T. I connected my Xbox One X to the HDMI 2.1 port because it supports VRR. HDMI passthrough is disable on this port and only PCM audio would have 0 delay. Any other series of configuration would add approximately 100 - 200 ms. I tried PCM 2.0 Stereo, to 5.1 Bistream and Dolby Atmos. Only when the TV is set to PCM that I didn't get any audio delay on the soundbar (Samsung HW-Q70T.) When I connect my box to a different HDMI port. HDMI passthrough becomes enable and I can do up to 5.1 Bistream (Dolby Digital) without any delay. If I switch to Dolby Atmos, the delay comes back. I also tried with the Playstation 4 pro. I had 0 delay using Bitstream Dolby 5.1. Using any Samsung apps have 0 delay. So to me it seems that even if you disable the audio delay from 100 to 0. The Samsung still applies that delay when you are using an external source. The problem is worst when you are using the HDMI 2.1 port with a device that support VRR. It seems like only PCM will work at this point. I bet a lot of Series X or Playstation 5 users are going to be infuriated when they bring home their new and shiny consoles and realize all the audio delay they will experience trying to use Dolby Atmos. I really hope Samsung does something about this because it's going to get rowdy next month
... View more