The production of the Steinway Diaphragmatic Soundboard is based on a 1936 patent to achieve optimum performance in dynamic range and maximum sustain. To meet the highest quality standards, only superior Sitka spruce with a regular grain and prescribed minimum number of annual growth rings is acceptable. The soundboard lies at the heart of a Steinway grand or upright piano, which is why great care is needed both in its design and in the selection of the wood. Large maple dowel ends provide a solid mount for adjustable brass touch-regulating screws. Crowned and reverse-crowned action frame gives a snug fit, intensifies key movement and prevents “slapping” during heavy playing. Horizonal and vertical birch planks present a vented system for humidity escapement. Durable Linden wood buttons reinforce keys over balance rail, permitting maximum tonal power with every strike. Chip-proof, stain-resistant coverings for naturals slip-proof, abraded ebonized sharps. keysĮuropean spruce, individually weighed-off. Horizontal-cut premium wool for effective dampening with maple heads for endurance. Compression-wired to maintain permanent shape. Premium wool top felt and under felt treated to resist insects and moisture. Longest: Agraffe/bridge: 79¼' (201 cm) hammers Treble: twelve whole & one-half sizes from high-tensile Swedish steel.īass: Swedish steel core wire wound with pure copper. Premium blued steel rust-resistant, nickeled heads strings Made from durable, resinous sugar pine to assure strong and constant support of string down-bearing on the soundboard rib ends are hand-fitted. Overstrung combination agraffe Front AND rear duplex. The Steinway & Sons iron wedge anchors brace ends securely to crossblock assuring permanent rim posture. A cast iron treble bell, affixed to rim's underside at treble bend, holds plate firmly in position by means of a steel bolt. Maple dowels fasten braces to rim producing a single homogenous foundation upon which is built the entire tonal component. (47,637 cm 3) Spruce provides tensile strength with less weight.

5 solid spruce braces with a volume of 2,907 cu.

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