How much of an upgrade in sonics between the two units?
I'll preface my response by saying my primary motivation for getting the AK380 was support of higher resolution files than what the AK240 supported (i.e. DXD). Otherwise I was very content with what I experienced with the AK240. Probably a foolish reason to spend so much money on the AK380 (even at a substantial sale price savings). I haven't had the AK380 very long but my initial impression is that the AK380 is better, but with only subtle improvements over the AK240 The primary difference that I hear is the way the sound stage is presented. It seems that everything is a little more well defined, in it's own space, with more air surrounding them. More transparent, detailed? Maybe I'll hear more over time (though it will be difficult to compare directly once my AK240 is hopefully sold!). If what I said so far seems like a luke-warm appraisal of the differences, I certainly enjoy what I'm hearing but I'm always a little leery about succumbing to "shiny new toy" syndrome and raving about new purchases.