Young Blonde Girl Reveals Her Necklace And Hold-ups With Dots On The Chair At The Old Piano

Striking the piano key with greater force increases the amplitude of the waves and therefore the volume. From pianissimo (pp) to fortissimo (ff) the hammer velocity changes by almost a factor of a hundred. The hammer contact time with the string shortens from 4 ms at pp to less than 2 ms at ff. If two wires adjusted to the same pitch are struck at the same time, the sound produced by one reinforces the other, and a louder combined sound of shorter duration is produced. If one wire vibrates out of synchronization with the other, they subtract from each other and produce a softer tone of longer duration.
Well-known piano makers
Well-known piano makers are (in alphabetical order): Bechstein, Blüthner, Bösendorfer, Broadwood, Fazioli, Feurich, Förster, Grotrian-Steinweg, Kawai, Mand, Petrof, Pfeiffer, Pleyel, Samick, Sauter, Schimmel, Seiler, Wilh. Steinberg, Steingraeber & Söhne, Steinway & Sons, Stuart & Sons and Yamaha.