The one shortcoming of 3182's has been the foam rubber surround which doesn't live long. Most of the used units on the market need reconing because of the foam surround rots. Bill had redesigned the cone with a fine looking very sturdy impregnated fabric surround similar to 515's, but much wider and more flexible for high travel. The pair I got today from GPA are truly excellent. Looking forward to getting them into some sturdy sub cabs.