This applies to both Amazon Prime and Netflix, although Netflix is the worst. I usually have my TV set on 20 for volume. When I'm watching through Roku I might have it as high as in the 60's to hear it, and the actual voices are still not real clear. Voices are hard to understand. I just have the Roku plugged into the TV through HDMI cable. But bottom line is I have no trouble listening to my TV unless I'm watching it through Roku.
Is there any help for this, a setting or something?