OK I do believe you meant Onkyo on the maker of that Denon makes the AVR-..... line of products....
In any event, as far as the auto-calibration goes it is common, depending on the level of the correction software, to get incorrect speaker distances---especially on the subwoofer. As for the cross-over frequency, that really depends on what kind of speakers you have...If you have small bookshelves then this would be correct. However if you have large floor-standing speakers then something might be a bit off....
If you give us more information on your room....seating listening position and distance....as well as the models of the speakers you are you, we will be able to help you out much more....
