The use of duplexes in the new generation of PETROF grand pianos
The speaking length of the piano string is from the capo V bar or from the agraffe to a bridge pin. The string vibrates in this section in its fundamental frequency, which determines the tone or pitch. Along with the fundamental frequency, the string always emits additional higher harmonic partial tones, which influence the tone colour or complexity.
The tone or note, which sounds only in its fundamental frequency, is quite simple, clean, but feels colourless, inexpressive, lifeless and uninteresting. The tones produced by musical instruments comprised from basic tone and higher complex harmonic tones, which together with the fundamental tone, makes it rich, and more importantly, makes each note sing!