Kawai Grand Feel and Responsive Hammer: Acoustic Piano Touch

Kawai • Craftsmanship • Engineering • Innovation

Touch is the most visible result of engineering

For a pianist, technology is first and foremost felt under the fingers. Kawai’s Grand Feel family focuses on wooden key construction and a long pivot approach, while the Responsive Hammer family focuses on graded hammer weighting, sensor control, and additional mechanical details that vary by model. When comparing these systems, one should not look at the names, but rather the version in the specific model, the number of sensors, let-off simulation, and features such as counterweights.

Legacy of craftsmanshipPiano building, material selection, and a culture of mastery since 1927.

Purposeful technologyKey action is not separate from the sound engine; the key is how sensor data is converted into dynamic sound response.

Global trustJapan-based development, international manufacturing, and a Kawai network spreading to the world's major markets.

Official sources: Kawai Company History · Kawai Legacy · Kawai Products & Technologies

KAWAI KEY ACTION

Kawai Grand Feel and Responsive Hammer: How is the Acoustic Piano Touch Created?

A detailed explanation of wooden keys, pivot length, triple sensors, let-off, counterweights, and the graded hammer system.

Short answer: In Kawai digital pianos, the Responsive Hammer family offers a compact and realistic weighted action, while the Grand Feel family provides long wooden keys and pivot movement close to a grand piano. As the model level increases, the sensors, let-off, counterweights, and key materials evolve.

Regardless of how realistic a piano's sound is, if the keys do not accurately read the performer's finger movements, the instrument will not feel close to an acoustic one. Kawai's difference lies in developing the sound and key action together.

How does an acoustic grand key move?

On a grand piano, a long wooden key moves around a pivot point and activates the hammer mechanism. Control, repetition speed, hammer weight, and the feel of the let-off at the front and back of the key affect playing technique. In a digital piano, the actual hammer does not strike a string, but the action must imitate that same resistance and trajectory of movement.

Responsive Hammer Compact

Actions like the RHC and RHCII are used in entry-level and compact Kawai models. A springless hammer design, graded weight by register, and three sensors in the RHCII create a stable foundation for daily practice and classical training. Models like the CX202 and KDP120 combine this approach with the SK‑EX sound.

Responsive Hammer III

The RHIII action provides more precise control with three sensors, let-off simulation, graded hammers, and counterweights. The third sensor helps repeat a note without fully releasing it. Counterweights soften the control of the key during soft pianissimo playing. Instruments like the DG30 and ES920 are well-known examples of this action.

Grand Feel: the role of the wooden key

In the Grand Feel family, each white key is crafted from a long piece of wood and utilizes pivot movement similar to an acoustic grand piano. The long pivot improves control, especially when playing closer to the back of the key. For chords, fast passages, and soft dynamics in classical repertoire, this detail makes a noticeable difference.

Responsive Hammer

Compact, with graded hammers, ranging from affordable to professional portable levels. Practical for home, education, and stage.

Grand Feel

Wooden keys, long pivot, and premium acoustic feel. Especially strong for the CA series and serious classical practice.

Let-off and escapement

On an acoustic grand piano, the hammer separates from the mechanism before it strikes the string. This subtle resistance felt during a very soft press is known as "let-off." Kawai simulates this feel in relevant digital actions. The goal is not just to create an effect, but to bring pianissimo control closer to an acoustic experience.

Sensors and note release

Kawai links not only the strike velocity but, in compatible actions, the speed of key release to the sound behavior as well. The decay character of a note changes between staccato and legato. This is an important example of the connection between the key action and the sound engine.

Who should choose which action?

Beginner: RHCII provides a correctly weighted foundation and three sensors.
Music school: RHIII or compatible CN actions provide ample room for development.
Classical and professional home practice: Grand Feel Compact and higher Grand Feel variants.
Portable/stage: The balance of weighted action and portability in the ES family.
Maximum proximity to acoustic action: The hybrid Novus series.

Key selection is a personal feeling. As the official distributor of Kawai in Azerbaijan, Royal Musical Instruments allows you to compare these models in one place.