I am wondering too, in my own experience (mine is X1800H that should be similar to the X1400H except it has more up to date features and the DAC IC is not as good as the X1400H's AK4458), this lower end AVR sounds just as good as any other higher models I have had. In theory, if don't need the higher power output, you are not going to hear dramatic difference in sound quality. Wolf11Man seems to be talking about the effects of Audyssey calibration, that if you use Mult EQ X, you likely will be able to get smoother and deeper bass response and that certainly could result in very audible difference, whether the difference is "extreme", or be "blow away" would likely depend on your own preference and perception, what might be blow away to some, may not be to you, could even be just subtle to you depending on many other factors. That's just me, and again, based on my own experience only.