i have cast woofers on my LFR's... prior to the LFR's, i was using M60's (which have stamped baskets, as they were bought prior to the option).. I can't hear any difference..... From a materials point of view there should be no difference in regidity between the two, due to the thickness of steel used in the stamped baskets. Also, the more folds you add to steel the stronger it gets from a sheet form.... There was somewhat of a materials conversation on this topic in the LFR thread.. If i remember i'll try to find those pages and link them to you here...

The main reason i got cast was for the astetics.... i knew there would be no realized sonic gain in having a cast over stamped basket when i placed my order.

Hope this helps.