It is my understanding that the Eidolon Vision is a replacement for the Eidolon. It employs the same drivers and enclosure, but uses the internal wiring and crossover topology developed for the Eidolon Diamond. The Diamond remains current without any changes. In summary, the Vision is like the Diamond except for the woofers and tweeters. For a nominal increase in the retail price, the Vision is much closer in performance to the Diamond (which is much better than the Eidolon).