Reading Qur’aan over loudspeakers before Jumu’ah

We know of no basis for doing that, whether from the
Qur’aan, the Sunnah, or the actions of the Sahaabah or the righteous
salaf (may Allaah be pleased with them all). According to the way you
have described it, that is to be considered as one of the newly-invented
matters which we should not do, because it is a newly-invented thing,
and because it may distract those who are praying and reading Qur’aan
from their prayers and reading. 

And Allaah knows best. May Allaah bless our prophet Muhammad
and his family and companions.