The 750 is basically the same receiver as the 1400. It has more DSPs, but 10 less watt/ch. the YPAO isn't the "full" YPAO, so it doesn't adjust the frequency response up and down the frequency spectrum, but does automatically figure out speaker distance and levels for you. I think the total harmonic distortion (THD) is .04% on the 1400, but is .06% on the 750. I have no idea whether this makes a difference, but this does allow the 1400 to get the THX logo.
The 750 (which I have hooked up to my current speakers - AXIOMs are still a couple of weeks out...:( is great, though. I haven't had an opportunity to set up the 6th and 7th channels yet, but it really shines on current system - can't wait til the real deal comes in....
Good luck to ya. I'll make sure to post my thoughts when it all comes in....It's tough finding anything on the internet that says anything about it, so maybe I'll be able to add something to the mix.
