Ways of The Prophet (S.A.W)
by Sheikh Muhammad Abdul Hai ArifiSAYING THE DU’A QUIETLY
Some ulama hold that while remembering ALLAAH (ZIKAR) and making supplication (Dua) for any purpose, it is best to do so quietly, whether one is Imam or performs Salaah by himself. The Prophets doing so loudly was intended to educate the Ummah. And if on any occasion, the Imam thinks it advisable to do so loudly, it is not only correct but also preferable. [Madarij -Un- Nubuwah]