"The world's most advanced Home Theater Receiver" is Denon's claim for the AVR-5800, and, now that I've spent a few months with it, they'll get no arguments from me. It's the world's first 7.1-channel receiver with DTS-ES Discrete 6.1, DTS-ES Matrix 6.1, DTS Neo:6, THX surround EX, Dolby Digital 5.1, and Dolby Pro Logic. It's like one of those new cruise ships that more closely resembles a floating city. What Denon has managed to pack into its large, sleek, heavy black hull (at 62 lbs, it's the most massive I've seen) is remarkable in terms of both versatility and performance. Denon's marketing manager, David Birch-Jones, proclaims the AVR-5800 to be "Without question the finest A/V receiver ever created." But are "most advanced" and "finest" necessarily the same thing? We'll have to dig deeper to find out.