Built Differently: Inside the Engineering That Makes Hailun Pianos Play and Sound the Way They Do

Aug 12
5 min read

When piano buyers compare instruments at a dealership, they assess what they can directly experience: the feel of the keys under their fingers, the warmth or brilliance of the tone, the responsiveness of the action to dynamic variation. What they cannot assess as easily is what produces those qualities — the specific components, design decisions, and manufacturing choices made years earlier that determine whether a piano sounds like a piano or merely looks like one.

Hailun has built its reputation on the quality of those underlying decisions. Understanding what goes into a Hailun piano — what makes its action feel the way it does, why its tone sits where it sits in the spectrum between brightness and warmth — is the best context for understanding why the instruments have received the recognition they have from players and industry evaluators alike.

The Action: PerformancePlus™ and Why It Matters

The action of a piano — the mechanical system connecting the key to the hammer — is the primary determinant of how the instrument responds to the player's touch. Its geometry, the weight of its components, the quality of its regulation, and the materials used throughout determine whether a pianist can execute subtle dynamic gradations, whether the response is consistent across the keyboard, and whether the instrument rewards technique or merely tolerates it.

Hailun's PerformancePlus™ action design represents the company's most significant engineering investment. The system uses parts manufactured from European Hornbeam — a dense, stable hardwood preferred by European piano makers for action components because of its dimensional stability under varying humidity and temperature conditions. The hammers use reinforced German felt, which is critical to tonal quality: hammer felt determines how the impact of hammer on string is shaped and softened, directly affecting the tonal character of every note across the instrument's range.

The action rail — the spine of the action mechanism — uses an aluminum core with maple reinforcement, a combination that provides the rigidity needed for accurate action geometry while remaining lighter than a solid wood rail. This contributes to consistent response and reduces the long-term effects of humidity-related dimensional change.

The PAS Keybed System: Stability Designed to Last

One of Hailun's proprietary engineering innovations is the Permanency-Accuracy-Stability (PAS) Keybed System — an aluminum keybed structure that replaces the traditional wood keybed used in most piano construction.

Wood keybeds are susceptible to the same humidity-driven expansion and contraction that affects all wood components in a piano. Over time, dimensional changes in the keybed can affect key height, key level, and the action regulation that determines how the piano responds to the player. In climates with significant seasonal humidity variation — and the Pacific Northwest, the upper Midwest, and many other American regions qualify — this is a real concern for long-term playability.

The aluminum PAS Keybed eliminates this variable. Because aluminum does not absorb or release moisture, the geometry of the keybed remains consistent regardless of ambient humidity, ensuring that the action regulation performed at the factory — and at subsequent service appointments — remains accurate over the life of the instrument. This is a design choice that reflects an engineering commitment to long-term performance rather than simply initial showroom impressiveness.

The Strings and Plate: German Röslau and Wet Sand Casting

The strings of a piano determine the raw material from which its sound is made; the plate that holds the strings under tension is the structural foundation on which everything else depends.

Hailun uses Röslau strings, manufactured in Germany, across its upright and grand piano lines. Röslau is the most widely specified string wire in premium piano manufacturing — used by Steinway, Bösendorfer, Bechstein, and other European makers — because of the consistency of its carbon steel composition, its precise wire diameter tolerances, and the stability of its acoustic properties. Using Röslau wire at Hailun's price points is a deliberate choice to use the material that the world's best piano makers use, rather than an alternative that costs less.

The plate — the cast iron harp that holds string tension, typically around 20 tons of force in a grand piano — is manufactured using a wet sand casting process. This is a traditional foundry method, more labor-intensive than modern alternatives, that produces plates with tighter dimensional tolerances and more consistent material density. The quality of the plate casting affects the piano's structural integrity, its resonance characteristics, and its ability to hold string tension consistently over decades.

Soundboards and Scale Design: The Tonal Foundation

The soundboard is the amplifying surface of a piano — the large wooden diaphragm that translates the vibration of the strings into the acoustic sound that fills a room. Its quality, species, and method of construction are among the most consequential determinants of a piano's ultimate tonal character.

Hailun uses solid spruce soundboards across its instrument line. Spruce — and specifically the quarter-sawn, tightly grained variety used in premium piano construction — is selected for its combination of stiffness and lightness: it vibrates freely across a wide frequency range while retaining the structural rigidity needed to maintain consistent acoustic properties over many years. The use of solid (rather than laminated) spruce places Hailun's soundboards in the same material category as instruments from European makers at dramatically higher price points.

The scale design of Hailun's larger instruments — particularly the HG198 and HG218 concert grands — reflects the contribution of Stéphane Paulello, whose work as a French scale designer and piano builder has shaped both the string length ratios and the tonal architecture of these instruments. Paulello's design philosophy emphasizes tonal balance across the full compass of the keyboard and a dynamic range capable of meeting the demands of professional performance.

The Hammers: German Abel in the Top of the Line

In the HG218, Hailun specifies German Abel hammers — one of the most respected hammer manufacturers in the world, whose products are specified by leading European piano makers for their consistency of felt density, weight, and tonal contribution. The choice of hammer manufacturer at the level of the HG218 reflects a straightforward principle: at the concert grand level, nothing less than the components used by the world's finest makers is appropriate.

Conclusion

The engineering decisions inside a Hailun piano are not visible through the cabinet or the finish. They are audible through the tone, tangible through the touch, and measurable through the consistency of the instrument's performance over years and decades. What Hailun has built — through deliberate partnerships with European and American engineering authorities, investment in premium materials, and proprietary innovations like the PAS Keybed — is an instrument that earns its reputation through what is inside it.

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