They heard not the voice... — i.e., they did not hear it as a voice uttering articulate words. It was for them as though it thundered. (See Notes on Acts 9:7, and John 12:29.)
Related Commentaries of Acts 22:9
Acts 22:9
9 And they that were with me saw indeed the light, and were afraid; but they heard not the voice of him that spake to me.