ayre v-6x vs. v-6xe


by looking at the case how can you tell if you have a 6x or 6xe?
looking at a you tube ad for the 6xe they both have v-6 on the rear of the amp do both have evolution on the front or is this how you tell the difference?
Convert?fit=crop&h=128&policy=eyjlehbpcnkioje1mdm0mtc1nzysimnhbgwiolsicmvhzcisimnvbnzlcnqixx0%3d&rotate=exif&signature=cb467d4120d21561a908ec70fd21299d2d81a15cb77731b2dadf9230833a0b74&w=128mboldda1