A:AnswerThe Sonos Arc does need to be plugged directly into the eARC or ARC HDMI port on the back of your television. This allows the Sonos Arc to playback Atmos content.
A:AnswerSonos doesn't disclose the wattage of their products but each of the Sonos Arc's 11 drivers is powered by it's own class D amplifier. Rest assured it gets plenty loud.