Would be cool if Android TV had an equalizer or normalizer
Some tvs have dynamic range control or compression. That setting sees to that.
Some receivers will have a "night mode" that can help fix this. Basically it reduces the range from loud and soft.
Keep in mind that this is not an issue with AndroidTV itself. But this is a very common issue especially with playback on heavily compressed copies of media. As /u/jss1234 mentioned, some TVs have Dynamic Range settings which will help a lot. Receivers that include this function tend to do a better job of it. The only alternative to Dynamic Range is to remaster the media itself.