Ash-Shama'il Al-Muhammadiyah, Book 44, Hadith 321 (In-Book)

Ibn 'Abbaas Radiyallahu 'Anhu says: "Rasulullah Sallallahu 'Alayhi Wasallam raised his voice only to the extent, that it might have been possible that if he recited in the house, those in the courtyard might be able to listen".

حَدَّثَنَا عَبْدُ اللهِ بْنُ عَبْدِ الرَّحْمَنِ، قَالَ‏:‏ حَدَّثَنَا يَحْيَى بْنُ حَسَّانَ، قَالَ‏:‏ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ أَبِي الزِّنَادِ، عَنْ عَمْرِو بْنِ أَبِي عَمْرٍو، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، قَالَ‏:‏ كَانَتْ قِرَاءَةُ النَّبِيِّ صلى الله عليه وسلم، رُبَّمَا يَسْمَعُهَا مَنْ فِي الْحُجْرَةِ وَهُوَ فِي الْبَيْتِ‏.‏

also referenced under: Book 43, Hadith 304 (English)