Kawai's Responsive Hammer III action uses an industry-standard design where the pivot point is placed at the back of the key, not in the middle. (This type of design is the only one used by every other digital piano brand.) These actions utilize a hammer component under the keys that creates a mechanical movement and feel similar to an acoustic piano. Additionally, the hammer weights are “graded” where the left-hand, or bass, keys are heaviest. As you move up the keyboard, the hammers gradually become lighter. This simulates the same characteristic found in an acoustic pianos action where the hammers are larger in the bass region and gradually get smaller as you move up the keyboard.
The Responsive Hammer III action is the latest versions of Kawai’s plastic-key actions. In addition to the aforementioned features, they offer “Ivory Touch” key surfaces, triple sensor key detection, and Let-off. The RHIII adds key counterbalancing.
Authentic 88-key Counterweights - In addition to grade-weighted hammers, the Responsive Hammer III keyboard action also features counterweights embedded within each black and white key.
As with an acoustic piano, these finely balanced weights help to lighten the touch of the keyboard during pianissimo passages, while adding a feel of greater substance when playing with force.
Triple sensor key detection - The Responsive Hammer III keyboard action utilizes an accurate triple-sensor key detection system for enhanced playing realism.
The added third sensor improves responsiveness when playing the same key repeatedly, and unlike conventional two sensor keyboard actions found in many digital pianos, allows the sound of a single note to be gradually ‘layered’ without the previous tone being lost.
In addition, Kawai’s action technology also monitors the speed at which each key is lifted, influencing the release character of piano sounds, and providing a greater range of expression between staccato and legato playing.
Ivory Touch key surfaces - The impressive CN29 and CN39 features Kawai’s highly regarded Ivory Touch key surfaces as standard. This finely textured material gently absorbs fingertip perspiration and oils to assist playing control, and possesses a natural, matte finish that is smooth but not slippery.
Furthermore, this moisture is absorbed without dirt or grease permeating the surface, allowing the keytops to be wiped clean easily using just a damp cloth.
Let-off Simulation - As the most authentic digital piano keyboard action in its class, Responsive Hammer III even reproduces the 'let-off' characteristic of acoustic piano actions.
This subtle 'notch' sensation can be felt when playing the keys of a grand piano very gently, and may be used by experienced pianists to aid control when playing pianissimo passages.