The X3800H uses cheap soundbar standard DACs made by TI, which explains the very poor SINAD results compared to the X3700H:
This is a review and detailed measurements of the Denon AVR-X3800H 9.4 Home Theater Audio/Video Receiver. It was kindly drop shipped to me by a member and costs US $1,699. Not much to say about the look of the unit as it is pretty much similar/same as last generations. Here is the back panel...
www.audiosciencereview.com
I'd wait for the X4800H, which is expected to have high-quality ESS DACs, similar to the X6700H.