‘ When they were by the house of Micah, they knew the voice of the young man the Levite, and they turned aside there, and said to him, “Who brought you here? And what are you doing in this place? And what have you here?” '
This may explain why they obtained hospitality from Micah. It was because by some chance they personally knew the Levite, and he had spoken up for them. And on hearing his voice on their arrival, they recognised it, and went to renew their acquaintance. Or it may have been because they recognised the dialect or priestly accent and were intrigued as to what he was doing there, (but ‘voice' would not naturally signify that). They wanted to know how he had got there, what he was doing there, and whether he had an advantageous position. He then probably introduced them to Micah who generously offered them hospitality. As so often in this type of literature something is described (Judges 18:2 b) and then the more detailed explanation follows. This was their way of writing.