Put it at the end of a build-up, just as the armor is revealed, then follow it with a bass drop as the hero steps forward. For a heavier armored entrance, lead in with a reload gun click before the suit sequence begins.
About this sound
This 13-second clip captures the mechanical whir, clicks and powered-up hum as Tony Stark's portable Mark 5 suit unfolds from its suitcase and locks into place around him. It feels tense, thrilling and heroic, like a last-second rescue arriving just in time. The sound comes from the Iron Man films, where the compact armor is built for emergencies on the move.