Originally posted by GoodOlDave
You are splitting hairs mighty thinly here. Any explosions that only could be heard by the people standing right next to them are by definition "quiet explosions". In the real world, any explosions that would constitute actual controlled demolitions would have been heard all the way across the river to New Jersey.
First, people did hear explosions blocks away from the towers, before either of them collapsed, but especially as they collapsed. The sound of either "collapse" was so incomprehensibly loud that people in Brooklyn said they could hear it. Minor earthquakes were caused by the collapses that could be felt much further away. Reporters thought that the ground underneath them was going to explode, that something was blowing up under them.
This wasn't some "select group," it was everybody within miles of the area that experienced these things.
You can look at any number of YouTube videos of the collapses from inside the buildings, or just outside them, and hear continuous "rumbles" (not "crashes" but low-frequency explosion-type sounds -- falling debris is NOT a low-frequency sound!! it is NOISE by definition -- across ALL frequencies!!) and deep "booom" sounds.

