It has an 8-bit processor to power what Kawai calls "DMS tone generation" and a patch can be built using one or two samples. It can save patches to a memory card, working with either a DC-16 or DC-32 RAM card.
The K4 uses a 12-volt external power supply rated for 500 mA of current (model PS-121G).
Year Released: 1989
Keyboard: 61 keys with velocity and aftertouch
Polyphony: 16 notes
Multitimbral: 8 parts
User Patches: 64
User Performances: 64
ROM: 256 16-bit PCM waveforms
Effects: two digital resonant -12dB filters, plus reverb, delay, chorus, flanger and distortion/overdrive via DSP.
Oscillator: 16-bit PCM
Screen: 16x2 character display
Power Consumption: 5.8 watts
Dimensions: 1020 mm x 310.8 mm x 88.5 mm
Weight: 7.3 kg