I owned an AX-7e for nearly 15 years. I wouldn’t be concerned about its age, should be good for years to come. I moved up to an AX-5 Twenty. I briefly heard an EX-8 about a year ago. It sounded great although I can’t compare to the AX-7 given the differences in room, speakers and source.
Not sure about the heat issue but Ayre should be able to help you decide if your cabinet might result in overheating.
Not sure about the heat issue but Ayre should be able to help you decide if your cabinet might result in overheating.