The Prophet's ﷺ recitation was loud enough for one who was in the inner chamber to hear it when he was in the house. (Using translation from Abū Dāʾūd 1327)
كَانَتْ قِرَاءَةُ رَسُولِ اللهِ ﷺ بِاللَّيْلِ قَدْرَ مَا يَسْمَعُهُ مَنْ فِي الْحُجْرَةِ وَهُوَ فِي الْبَيْتِ