The HK's power ratings are more accurate than the Denon's. But both brands provide plenty of power. The Denon's have different model numbers because they sell different branded products to different types of clientele. I know the 684-1604 and the 884(which I own)-1804 are the same recievers. I'm not sure what the 982's 4 digit equivalent is. Either way you can't go wrong with Denon or HK.