When a Muslim recites the Qur’an he/she is presumed to recite it silently by moving lips and making it heard by oneself. This is in case one may disturb others. Abu Sa`id al-Khudri narrated that the Messenger of Allah (peace be upon him) retreated to the mosque. He heard them (the people) reciting the Qur’an in a loud voice. He removed the curtain and said: Lo! everyone of you is calling his Lord quietly. One should not trouble the other and one should not raise the voice in recitation or in prayer over the voice of the other. If it does not cause such a disturbance, one may raise his voice as long as he does not do that out of showing off or letting people listen to his recitation in order to praise him.

Almighty Allah knows best.