Hi @Patki
Welcome to the Sonos Community!
I am sorry to hear of this issue you are having with the Sonos Voice Assistant’s voice being at a lower volume than other content.
This issue is not reproducible for us, so I recommend that you reboot the speaker concerned by unplugging it from power for a moment.
If this does not help, I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports.
I hope this helps.