User Manual Sonos BEAM1US1BLK Sound Bars

Yes, for TVs that don't have an HDMI-ARC port, you can use the
included optical audio adapter to connect Sonos Beam to the
optical port on your TV.

Sonos Beam can stream music wirelessly from online music
services or local music libraries, but an HDMI cable will be required
between the TV and Beam.

Yes, Sonos Beam features an auto-switching 100 - 240 VAC, 50/60
Hz universal power supply.

While we can't speak to the Polk command bar, Sonos Beam
features Amazon Alexa voice control, five class-d digital amplifiers,
four full-range woofers, one tweeter, and three passive radiators to
help move air around inside and add warm sound to the bass.

Yes, Sonos Beam ships with an HDMI cable included in the box.