I bought a TCL Alto 7.2.0 soundbar to pair with my TCL 55R617 TV via HDMI ARC - seems to be a popular kit at Revain. Unfortunately, it has a serious disadvantage. Minor downsides include a slightly "dirty" sound, low-frequency dialogue is very difficult to hear, a volume control that's painfully slow to adjust between quiet and slightly loud, and a downside that means it does when you Using the TV and soundbar combo does not turn off manually but sleeps due to inactivity, the soundbar does not wake up and needs to be disabled to turn it off. This alone is enough to make me regret my purchase. My old soundbar works better. The main downside was one that I only realized after a few days of watching: the picture and sound are a bit out of sync. Once you see it, it's so annoying that it becomes hard to see. Reading the user experience on the Roku Reddit forums, it seems that the only way to solve this problem is to use the SPDIF input and set the audio to PCM stereo, so I'm hoping this is the are options you wanted to choose. No? Then buy something else.
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