The Foundation of Piano Sound: Strings and Soundboards

At its core, a piano produces sound through strings stretched over a soundboard. When a key is pressed, a hammer strikes one or more strings, causing them to vibrate. These vibrations are transferred to the soundboard, which amplifies them and creates the rich, resonant tones we associate with the piano. The precise length, tension, and mass of each string determine the pitch of the notes they produce. This is where the physics of sound waves plays a crucial role.

The Role of Harmonics in Piano Tuning

One of the critical concepts in piano tuning is understanding harmonics or overtones. These are higher-frequency sounds produced when a string vibrates, in addition to the fundamental frequency. Each string produces a series of harmonics that are integral to the character of the piano’s sound. When tuning a piano, a tuner listens not only for the fundamental pitch but also for these harmonics to align perfectly across all the strings.

This alignment is crucial because it affects the timbre and richness of the sound. If the harmonics are not correctly aligned, the piano will sound out of tune, even if the fundamental frequencies are correct. This is particularly challenging in a humid city like Tampa, where wood can swell and contract, subtly altering the tension and, thus, the piano’s tuning over time.

Temperament and Tuning Systems

Piano tuning also involves choosing the right temperament or tuning system. Historically, tuners used just intonation based on pure harmonic ratios, but this system did not allow instruments to change keys smoothly. Modern pianos typically use equal temperament, where the octave is divided into twelve equal steps. This allows for consistent tuning across all keys, which is especially important for versatile performance demands, such as those faced by pianists in Tampa’s diverse music venues.

A piano tuner uses sophisticated tools and techniques to adjust the tension of each piano string to achieve this equal temperament. This process requires not only an understanding of the physical properties of the strings but also an ear trained to detect minute differences in pitch and tone.

The Impact of Physics: String Tension and Length

The physics behind string tension and length is another critical aspect of piano tuning. The tension of a string must be precisely controlled to produce the correct pitch. This tension is adjusted by turning the tuning pins, which can be a delicate process. If the tension is too high, the string may break; if it’s too low, the note will sound flat. Additionally, the length and thickness of the strings affect their tension and, consequently, the pitch. Bass strings, for instance, are thicker and longer, requiring different tuning considerations than treble strings.

The Art of Listening and Adjusting

Ultimately, the science of piano tuning is about understanding and manipulating the physical properties of the piano to produce the desired sound. This requires a blend of technical knowledge and sensory skills. A good piano tuner combines a sharp ear with an understanding of acoustics and physics to keep pianos sounding their best. For those in Tampa, engaging a professional piano tuner from a dedicated service like Tampa Piano Tuning can ensure your instrument receives the meticulous care it deserves. Whether it’s a concert grand in a large venue or an upright in a home, every piano benefits from the expertise of a knowledgeable tuner. This blend of science and art ensures that the music never stops resonating beautifully.

Picture Credit: Dave’s Piano Showroom

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Coquelin has prepared pianos for concerts by renowned performers, including Rubinstein, Aldo Ciccolini, Boris Berezovsky, Gabriel Taccino, and Michel Béroff, among others, and has worked with numerous priceless pianos.

Coquelin discusses the differences between tuning and setting a piano, the reasons why two new acoustic pianos of the same brand and model might sound different, and how often pianos should be tuned.

Selecting & Caring For The Soundboard
According to Coquelin, the “soul” or soundboard of a piano is made of spruce or fir planks. These boards are carefully chosen, put together, and joined at the edges with glue. The bridge, which transfers the vibration of the strings, causes the table to vibrate. Part of the mechanical energy of the strings is converted into acoustic energy to perform its acoustic function.

Bar tables support the soundboard, which emits sound waves that are dependent on the density of the wood. Due to this, two identical piano models from the same manufacturer and production line may have different resonance and tones. The sound of pianos can also vary depending on the density of the hammer felts. Each person has a different predilection for the sound that pianos generate, according to Coquelin.

The Concept of Untuning Over Time
Furthermore, according to Coquelin, the strain of the piano causes a physical phenomenon that causes pianos to gradually lose their tuning over time. Whether or not they are played, the excessively tight strings will eventually start to relax. Temperature and humidity levels both play a significant part in whether the piano remains in tune.

Temperature fluctuations will make the de-tuning worse, especially in dry conditions or when there is active heating. It is highly advised to maintain a consistent relative humidity between 50 and 65% for a temperature between 18 and 21 °C, especially during the winter, to keep a piano in tune.

How Often Should You Need Piano Tuning?
Coquelin responds to the question of how frequently a piano should be tuned by saying that an acoustic piano should ideally be tuned four times a year, once for each change in season, for the reasons stated above. A piano need to be serviced at least twice a year, in the spring and the autumn. The frequency of use, however, can also affect how often a piano need to be tuned. For instance, a piano that is played six hours a day should be tuned once a month.

Difference Between Piano Tuning By Ear & Instrument
Coquelin further clarifies the distinction between tuning by instrument and tuning by ear. Although an electronic tuner can supply a piano with excellent precision, the human ear tends to mishear it. The tuner is finely tuned to the equal temperament and is skilled at interpreting sound to a degree of accuracy that is pleasing to the ear.

It takes practice, according to Coquelin, for the sound to develop color and appear pure to the human ear. This is referred to as a piano’s musicality, and in a physical sense, it will be an “imperfect” perfection. According to Coquelin, the human ear cannot be replaced by a machine or other tool, and the tuner still has a promising future.

Difference Between Piano Tuning & Setting the Piano
Finally, in response to a query on the distinction between tuning and setting a piano, Coquelin clarifies that setting a piano entails modifying the internal mechanics to guarantee appropriate operation. This involves fine-tuning the piano’s action, which comprises the keys, pedals, and hammers.

If you’re in the Tampa, FL, area and need professional piano tuning services, be sure to consider Phil Frohna Piano Tuning. With years of experience and a commitment to providing top-quality service, Phil Frohna is dedicated to ensuring that your piano sounds its best.

Picture Credit: Pixabay

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