Kodi forge the voice of the narrator on my documentaries. help please!

Hi, I use Kodi to watch my UHD documentaries made with my 4k videocamera. I watch them with Sony Bravia 65″ TV and I have a good stereo system to listen them.
When I watch a documentary with Kodi, the music but above all the voice of the narrator is higher volume and that audio seems to have loudness filter (with higher bass).
When I watch the same video (but all the videos) with another software (software for default in my TV) everithing is perfect. Do I have to configure the audio in Kodi? But I don’t see that option.
Can I solve my problem?
Thanks