Thanks a friend of mine asked me I told him I have no clue ill ask where he heard it and get back to u
Can you post a link to something that has this?
I am no speaker guru, so Rusty could probably answer this, but I will take a guess. What I would think is that since the BL is the measurement of Motor Force/Strength, it may mean that the sub in question has a 26mm xmax when 60% of the total motor force is being used. I might be ass backwards there, but that is just my guess.