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Does not require 2.1 cable. But if your TV HDMI is only 2.0 more than likely your TV does not have Dolby Atmos pass through like my old TCL had Best thing is to run can use a 2.0 18 GB cable to the sound bar HDMI 1 or 2 input for example I had my fire stick 4K Maxx hooked up directly into the sound bar and you will get Dolby Atmos running your four example fire 4K Max stick to your TV first if your TV does not have Dolby Atmos or DTSX pass through and only has maybe Dolby digital Plus or lower you won't get the full effect. I do try and run 2.1 cables which I believe handle up to 48 GB but mostly those I think are used for gamers which I'm not but I do buy the cables and use them. Now if you buy a 4K Blu-ray player you need that 18 GB cable which is 2.0 if you use anything older you'll either not get a picture with sound or vice versa. One good thing about the fire TV 4K Maxx stick you can go into settings and they have a Dolby Atmos test in there and also list what your sound bar is capable of sometimes I've had to reset the fire stick for it to show up properly but at least you'll know if you have it or not hooked up right Hope I've helped. Should have been an easy question for Vizio to answer.
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