Ultra Spotify app is low res . However Spotify app via LG OLED B4 much higher res.? Therefore running optical cable tv to Ultra. Prefer to use eARC on AVR because of subwoofer ; sound et al. Ultra line out to intergrated amp and speaker switch to use surround speaker setup in stereo mode; front 2 speakers. Has anyone tried eARC and subwoofer from tv to Ultra and then to AVR for full surround.