"A speaker creates sound by pushing air at different frequencies. What you hear are the sound waves from that air being pushed. Now with subs in a sealed trunk with no direct passage into the cabin how on Earth could you hear the air that is being pushed?"
A while ago I stopped at 5-guys burger joint and picked up a couple of cheese burgers and a couple of bags of frys for the family. It was a 15+ minute drive home, so I put them all in the rear trunk to keep them warm. As soon as I started driving, all I could smell all the way home was burgers and frys. Based on that experience, there would seem to have to be some way for air to get from the rear trunk to the passenger compartment, I found that interesting,
Ed