Forum Discussion
You didnt mention your model # or firmware version or YTTV app version.
Google recently enabled 5.1 (DD/AC3) audio playback for Live TV, and this may be the source of the volume disparity.
As DBDukes explained, Google is responsible for the content (including volume levels) of its content and is the best party able to fix the content of one channel's volume, and you can otherwise try the Sound/Volume Modes for your device as DBDukes suggests to alleviate the volume disparity.
If Sound/Volume Mode's (such as Leveling/Night Mode) don't work, try changing your audio output to stereo: Settings/Audio/Audio mode = Stereo and/or Settings/Audio/Digital output format = Stereo
I have a Roku TV and had same problem. I found that Turning off Surround Sound (in the YouTubeTV app on my TV) fixed the problem...