I have not changed them but I did audition the ovation (with the aluminum platform)comparing it to my latest edition encores and could not tell a difference blinded. Now, set up was a little different but they sounded very similar. That being said, my Encores are nearing the 10 year mark, on thier 10th birthday I am going to send them to Verity for an overhaul, check all the innards and drivers, replace the grills with the new ones and go to the new aluminum platform. I plan on keeping the speakers at least another 10 years so for me it is worth it.