Denon’s 11-channel receiver is a feature-rich, one box solution to running a full 7.1.4 home cinema, even adding Auro3D format support to the expected Dolby Atmos/DTS:X roster. Sound performance, polished via Audyssey’s top-line MultEQ XT32 calibration system, exhibits power, speed, detail and nuance, and although the AVR-X6400H’s extensive connectivity (including three 4K HDR-capable HDMI outputs and eight inputs) caters for complex setups, day-to-day operation is fuss-free. Integration with HEOS hardware opens up multiroom possibilities. It’s a class act.