How do you find out driver displacement

bassfishing Silver Member Username: Langless28 Post Number: 327 Registered: Dec-04	Posted on Saturday, February 25, 2006 - 18:36 GMT how do you find out driver displacement. its a kappa perfect 12.1D. its not on the spec sheet.
James Longo Gold Member Username: James1115 Ct Post Number: 5240 Registered: Dec-04	Posted on Saturday, February 25, 2006 - 21:10 GMT .108