Hmmm good question. As I’m looking at this passage …
The Lord will give a shout … I only think the saved will hear that since Jesus said “My sheep hear My voice“ …. however there is the voice of the archangel … which archangel? Michael? Gabriel? Raphael? Will the unsaved hear the archangel voice? And then there is the trump of God … perhaps the unsaved will hear the trumpet sound but will be puzzled because a few years ago there were lots of Skyquakes … which are unexplained reports of a phenomenon that sounds like a cannon, trumpet or a sonic boom coming from the sky. The unsaved were hearing them … so perhaps that is what they will hear?
1 Thessalonians 4:16-17
For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:
Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.