Responding to the Salam with a Low Voice
Machine translationRead the Arabic original
Question : Now, if someone greets you by saying, "As-salamu alaykum," and you reply, "Alaykum as-salam," but he said it in a clear, audible voice, and the second person responded in a low voice,
Answer : he may or may not hear it. Did he return the greeting? I see, my brothers, that he did not return it, because he said[An-Nisa 4:86] That is fine.
Answer : he may or may not hear it. Did he return the greeting? I see, my brothers, that he did not return it, because he said
greet [in return] with one better than it or [at least] return it [in a like manner]
فَحَيُّوا بِأَحْسَنَ مِنْهَا أَوْ رُدُّوهَا
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 28 - 64 رد السلام بصوت منخفض - طالب العلم والمجتمع - ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.