There is a lag in the sound from TV thru the sound bar so voice is off from peoples voice on the screen. Does not have this with sound bar turned off so its a Sound Bar problem. Over all this Sound Bar is just not worth $1500 Then also you have No control over the volume of the 2 Surround speakers as the sound bar drowns out them! Terrible product my Opinion!!!!
I also have this delay problem with my tv receiver (connected on my TV HDMI ARC).
On my TV audio configuration setting i have the choice between :
If i choose stereo, no more issue but i can't have 5.1 ... The issue happens only with Multichannel or Multichannel bypass.
However no problem with my Nvidia Shield and my Nintendo Switch connected on the N950.
I really recommend you to read the manual for the soundbar. You can adjust lip sync problem with the SYNC function in the soundbar and you can also adjust the volume of rear speakers for sure (and not only the rear speakers). Both functions are in OPTIONS...
Although there is a setting on the soundbar to adjust lip sync this wont fix the problem as you need to go into negative to sort the lip sync issue (another common fault at present on this soundbar) and it only gives positive + adjustment.
I experienced the same problem with the HW-N950 not having the proper adjustment latitude to correct the lag problem. Fortunately, my Samsung TV has its own lag control that corrected the lip synch problem.
My samsung tv qled 65 "2018 also has sound delay option, I think it is between 20 and 40 but it is not always, in what number or options you have managed to synchronize.
Please samsung should solve the problem of this sound bar of 1500e, in PCM the synchronization is perfect, in Dolby Digital it is 95%, it is clearer this error in TV channels with digital or digital dolby signal +, in MKV files , in scenes of movies with knocking on the door with your hand for example is synchronized to 100x100, Who has this error happens in any format, tv or usb?