Denon uses two sets of model numbers. The 1000 series is more extensive & is for A/V dealers. The 100 series is less extensive & for selling through mass merchandisers. Some models are identically overlapped, such as the 2807 & 987 you cite. This model/these models happen to be quite bodacious.
A little pricey but one helluva unit.
please tell me the difference between the denon avr 2807 and the denon avr 987.thanks!!!