Stereo keyboard amplifier with 320 watts of power. Onboard mixer with four stereo input channels, stereo auxiliary input, and master EQ. Two newly developed custom 12-inch woofers and two custom horn tweeters. Built-in effects: reverb, chorus, tremolo, and rotary. Control rotary speed and effects on/off with optional external footswitches. Flexible I/O with XLR mic input, stereo XLR and 6,3 mm jack line outputs, headphones output, and more. Stereo Link function for chaining two KC-990s. Metal jacks for increased durability. Casters and side-mounted handles for enhanced mobility.