Audio quality of Voice Over worse after rendering

I have an issue with audio quality after rendering. I recorded a voice over and used the EQ to enhance the audio. The sound is really good, when I play it in the edit tab. After rendering (I tried all formats and used the highest quality, but ir didn‘t change anything) the sound is worse and my voice sounds slightly distorted (somehow like a computer voice). Du you have any idea to fix this?
I this better in the studio version?

Can you post a short sample for us to hear?