Hello reddish,
Denon doesn't skimp on heat sinks and cooling of their receiver's output sections, which means the 3802 will drive low impedances (4 ohms) and remain stable, without overheating or triggering of protection circuitry. The latter can happen with some other receiver brands that offer a lot of features but short-change the power-amp sections of the receivers. Typically, those will state that the receiver amps will drive only 6-ohm loads or higher, which is okay if all your speakers have 8-ohm impedances, but not okay if you are planning to get speakers with a nominal 4-ohm impedance rating.
Regards,
