- Flagship 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 ¼-inch 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