Has anyone tested, or experienced and heard the difference between super compliant old nearly falling apart but still intact foam-surrounds, which might allow greater excursions of cone, and brand newly installed foams which are fresh and relatively stiff units when compared to the say, the condition of 12-15 year old types found originally on used speakers. Fs might be different? By how much?? Will I hear less deep bass with fresh foams?? What is the best method to "break-in" new foams? A certain frequency? General music? Thanks for any information on this subject.. T.G.