What i did is connect hdmi from arc (TV) TO earc ( sound bar) and connect my sheild to hdmi port drom TV as well is this right (1)?

Secondly when i play any atmos from my shield ( passthrough) to soundbar i navigate from my tv and set digital output audio from the default (PCM) TO dolby digital plus. Then i noticed better sound and louder and cleaner.

Is that right?