I’d suggest plugging the Apple TV into the VAVA directly (with a quality, short HDMI cable). Then plug the sound bar into another HDMI port and have your sound output over ARC to that port. Works well for me, but I have a receiver instead of a sound bar in this same configuration.
plug apple to vava hdmi, then plug hdmi into soundbar arc hdmi port and vava arc hdmi port then in the vava sound settings turn on arc sound output. then turn vava off and on for it to work