Xbox Series X and Vizio Sound Bar

Same issue here.

I’ve got my Series X hooked up to a brand new LG C2 using the HDMI cord that came with the Series X.

I’ve got an Atmos-enabled Vizio sound bar (5.1 + two height speakers in the sound bar) hooked into the TV’s HDMI-Arc port.

I have no issues with Atmos sound when playing games on Series X. I have no issues when watching Atmos-compatible movies in streaming apps like Apple or Disney+.

But, when I play an Atmos-enabled 4K Blu-ray Disc on the Series X blu-ray app, I get this weird audio buffer after a few minutes. The movie may go 20 minutes without, but once is starts going it gets more consistent. This issue persists regardless of which Atmost-enabled 4K Blu-ray I use.

I’ve tried messing with the settings - switching back and forth on allowing pass through, etc.

Funny thing is, on my older TV (a TCL Series 6 which was not VRR or 120 hz compatible) I had zero issues. My Series X would play Atmos 4K blu-rays no problem. Only difference I can think of is that on my old setup I hooked the Series X directly into the input of the sound bar and then output from the sound bar into the TV (it was the only way I could get Atmos to work on the old TCL Series 6). On my current set up with the LG C2 I don’t do that because passing the Series X through the sound bar would take away the VRR and 120 hz capabilities my new TV can do.

Can anyone help?

same issue. Also vizio sound bar. no problems with DTS or stereo

Looks like mi Vizio E422VL TV has CEC (no mention of ARC) but my Vizio 3821-C6 sound bar does not have HDMI.

I suspected I would need a new sound bar, which is why looking for recommendations.

I get that the sound issue is best resolved treated as a TV/SB issue.

I have the vizio S4251W-B4 5.1 sound bar hooked up straight to the xbox one using digital optical audio cable. Volume up and down command works for me. This sound bar supports DTS.

Can you provide an update for your situation? I tried the optical connection first and it worked fine, but hooking everything up using HDMI is not working for sound. Here's my setup...I have a UHD Samsung TV, Cisco cable box, Xbox One, and a Vizio S5451w-C2
sound bar. The Vizio sound bar has a HDMI ARC connection option. I have my connections set up as follows ALL WITH HDMI CONNECTIONS::

Cable box --> Xbox One --> Vizio sound bar (HDMI Input) --> Vizio sound bar (HDMI Output)--> Samsung UHD TV (HDMI ARC)

I can get video just fine using this connection, but NO sound. My TV settings are good to go, but I'm wondering if there is some Xbox audio setting that is the final piece to this puzzle. Currently, my "HDMI audio" is set to "5.1 uncompressed" and "Bitstream
format" is set to "DTS Digital Surround". Does anyone know if these are correct or if there is something I'm missing?