Sorry to hear you are having issues hearing voices:

• In the app for your soundbar turn on Speech Enhancement 
• Adding surrounds would not help

Thank you for your quick response.

We have the same issues with our Arc, our old Beam gen1 is easier to hear dialog on. We have an Arc Ultra on order that is reported (and why we bought it) to have much better speech enhancement options.

Do what you can with Night Sound, Speech Enhancement and the tone controls and if it isn’t enough consider the Ultra. If the Arc is still in the return window don’t let it close on you.