Wait? I though everyone was doing this test on their HT system?!?
I had no idea there headphones out there can play anything close to 5Hz?
Regardless of having 2Hz capable cans (if they do exist), it seems as though using headphones to perform a test like this would skew ones perception of "weight" given the mechanical nature of ULF (ELF) pressure waves and the interaction they have on your body and any other objects with a HT space.
Or am I way off base?