I have a near-mint ZX-9 and really love it. Friend of mine had the 682ZX and we hooked them both up side-by-side in the same system and made comparisons....I honestly can't say there was a noticeable difference in sound. We both concluded the ZX-9 was "cooler" but that was about it. Either one will produce about as good a result with cassettes as you will get at that price point....