Ikrimah (may Allah have mercy on him) narrates from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) would recite so loudly that whoever was in the chamber could hear it, and his (peace and blessings be upon him) chamber was in the house.
(b) Sa'id bin Mansur (may Allah have mercy on him) narrates from Ibn Abi al-Zinad (may Allah have mercy on him) that the recitation of the Prophet (peace and blessings be upon him) could be heard outside the chamber, and his (peace and blessings be upon him) chamber was in the house.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4698