In terms of raw power, the HK 990 is the most muscular amplifier ever to carry the Harman Kardon badge, and is more than capable of driving the most demanding loudspeaker loads without breaking a sweat. However, the awesome power is nothing if not highly refined, extending beyond watts and amps. With a choice of discrete optical or digital inputs or an analogue-only signal path, as well as fourth-generation Real-Time Linear Smoothing (RLS IV), 2.2-channel EzSet/EQ room optimization, dual subwoofer outputs, and an audiophile-quality phono preamp section, the HK 990 offers a combination of features you will find irresistible.