I have a question for seasoned Pioneer enthusiasts: The SA-9500 is rated at nearly double the power of an SA-7500, but does it have an advantage sound wise over the SA-7500? I know this is subjective, and I have read the differences in their measured performance, but I would appreciate some opinions if you have them. I'm in a position to gain an SA-9500, but may have to sacrifice my SA-7500 to get it. Both units are restored. Thanks!