Determining tuning frequency of a cabinet using garbanzo beans. 

I learned a cool trick from Phil Bamberg from Bamberg Audio regarding how to determine the tuning frequency of a system using rice or beans in the cone and running a frequency sweep through the tuning frequency of the cabinet.
Theoretically, the frequency that the rice or beans stop moving is the tuning frequency of the system.
Take a look at the video to see how it works.