X600 is my preference for two main reasons. It has two tweeters the X500 doesn’t, making it a more dynamic with a wider sound stage and secondly it has a physical bass boost button that is missing on the X500. It also has a lush green colour way and is only $20 £15 dearer than the X500. Unless space is an issue go for the X600......
I was watching your vid and wondering if the speaker might be waterproof? About then you pulled off your Epic watering of the speaker. That was quite awesome. Thanks, great review.