Hi
Is it natural?
Please speak in (into?) the mike.
https://www.google.com.pk/search?q=loud+speaker&biw=1024&bih=677&source=lnms&tbm=isch&sa=X&ved=0CAYQ_AUoAWoVChMI_LvI48_jyAIVUBiOCh2_Fg4W#tbm=isch&q=sound+mikeThanks,
Tom
PS:
What word would we use in a situation like this? Sound system?
You'll need
sound system if you want everyone to hear the recitation. The audience will be considerably large.