The Version 2, signature and platinum are the same, new coating on tweeter, some crossover upgrades and wiring changes from the original. The first to come was the Ver 2 followed by cosmetic changes and an extended warranty with the signature. Lastly the Platinum which I believe was simply cosmetic changes. I loved to original and have been very happy with the platinum C1 now for over 4 years. I am in a small listening space and have found no reason to seek greener pastures.
