Raising the voice in recitation to the point of distracting those around. It is recommended (mustahabb) that one hears himself, not to the point that it interrupts anyone who is reciting the Qur’aan or making salaah.
Al-Bukhaari and Muslim both transmit from‘Umraan Ibn Husain (radiallahu ‘anhu) that the Messenger of Allah (sallallahu ‘alaihi wasallam) prayed Dhuhr and there was a man behind him reciting ‘sabbihisma rabbikal-‘alaa’ , so when he (sallallahu ‘alaihi wa sallam) finished he said: Who among you was reciting or who was the reciter? The man said, “Me.” So he (sallallahu ‘alaihi wa sallam) said: I thought that some of you were disputing with me in it.
The scholars state: The meaning of his words is a disapproval of the act. Ibn Taymiyyah (rahimahullah) stated: Whoever is reciting the Qur’aan and the people are praying additional prayer then it is not correct for him to recite aloud thus disturbing them because the Prophet (sallallahu ‘alaihiwa sallam) left some of his companions while they were praying As-Sahr (before dawn) and he said: O people, each of you is seeking salvation from his Rabb therefore do not overpower one another with your recitation.