I guess you use your SQ in a studio environment !
In normal condition I can’t hear the fans, but yeah, before the offline editor, at home, I could hear it .
Reducing the speed is not recommanded, It will affect the cooling efficiency, and for sure the fan controller will try to reach the expected idle cpu température, by running them faster !
I would prefer to replace them with silent one offering the same or more airflow… maybe when the garanty is over would be preferable , but you already know that !