Roku is plug-n-play device however if there is any audio issue it can be taken care off by small checks.
Audio problems on the Roku, like no audio, distorted audio, or audio dropouts, can be caused by software settings or problems with your hardware and/or cables depending on the complexity of your setup.
At first We suggest turnoff the Roku device for 10 seconds and then turn it on, most of the audio issues can be resolved by restarting Roku device
If the Roku device is directly connected to Television and not thru soundbar or AVR, then with the help of TV Remote try increasing the volume, check the mute setting if that’s working fine then change the HDMI cable
Check if the correct HDMI input is selected on you’re a/V receiver, HDMI switcher, or soundbar
If your Roku is connected to an A/V receiver or soundbar using an optical (TOSLink) cable, try the following:
If your Roku is connected to an A/V receiver, soundbar, or TV via HDMI, try the following:
It’s fairly rare, but on occasion, your HDMI, optical, or component cables can be faulty. If none of the steps so far have helped, try switching out your cable(s) with another set. This can be frustrating if you don’t have an extra set handy, but the good news is that all three types are inexpensive and you can find them at your local retailer or online.
We’ve seen reports, specifically related to the Roku Ultra, but possibly on other models as well, of garbled or distorted audio. A fix that seems to work in this instance, is to begin playback of the desired video, then: