It is not BS at all. I let my Bose 301s break-in and they improved. First I put them in the garage. Then Katrina put a Live Oak through the garage. Then I let the 301s marinate in the crushed open-top garage for about 4 months. Pulled out the crushed speakers and plugged them in...what do you know, them high-falutin paper cones sounded just a touch better between 11.7 and 83.98 hz. I think it was the tree sap, but could have been the 4 month baking/wetting/baking cycle. They are for sale if anyone wants to experience the best of Bose.
Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire