A diaphragm loading the bridge drives the Stroh violin’s horn

Evidence

Can something be inserted between string and violin body to lessen the impedance mismatch, thus allowing the energy to take two smaller steps, instead of one large one? While we are at it, can we sweeten the sound by modulating the impedance (and ultimately the loudness of the instrument) according to frequency? The answer is yes: this is the job of the bridge, as we discuss in chapter 18. The bridge is the “intermediate coin” that mediates the transfer of energy from string to body. Its impedance is cleverly tuned by choice of shape, size, and material to depend in a certain way on the frequency of vibration. — Eric J. Heller, Why You Hear What You Hear- An…, 79 (#expands, via linked claim)

As was stated in a scholarly paper by A. G. Webster in 1919, when such phonographs were still in regular use, “it is well known that very little sound is emitted by the phonograph … with the horn taken off, although in the former case the motion of the diaphragm is exactly the same.” This is an important point. The action of the horn is not somehow to make the diaphragm move more vigorously; rather, the diaphragm motion is the same. More power is produced because of the presence of an enclosing chamber and the horn that leads from it. The former resonantly loads the source; the latter gets the sound out with minimal reflections. — Eric J. Heller, Why You Hear What You Hear- An…, 539 (#expands, via linked claim)

Categorization

• XREF: connects to: Stroh violins were invented to direct string sound into early recording horns — Eric J. Heller, Why You Hear What You Hear- An…, 1859; The violin bridge acts as a frequency-tuned impedance-matching intermediary — Eric J. Heller, Why You Hear What You Hear- An…, 79; A tapping bridge adds trumpet-like harmonics to a bowed monochord (+1 more)

Related

• The violin bridge acts as a frequency-tuned impedance-matching intermediary (similarity 0.88)
• Stroh violins were invented to direct string sound into early recording horns (similarity 0.87)
• A Stroh violin amplifies string vibrations via proximity resonance and horn color (similarity 0.85)
• Bridge resonance presents an impedance minimum, making it flute-like. (similarity 0.84)
• A tapping bridge adds trumpet-like harmonics to a bowed monochord (similarity 0.84)
• A horn amplifies sound without increasing diaphragm motion (similarity 0.81)
• A resonant violin bridge presents an impedance minimum, unlike wind instruments (similarity 0.80)
• The violin bridge’s carved resonance boosts treble frequencies to shape timbre (similarity 0.80)
• The bridge transduces string vibration via tuned rocking and squatting resonances (similarity 0.80)
• A horn’s main benefit is source loading, not directional aiming. (similarity 0.79)

Broader Connections

• A tapping bridge adds trumpet-like harmonics to a bowed monochord #expands (0.82)
• The violin bridge acts as a frequency-tuned impedance-matching intermediary #expands (0.80) — Eric J. Heller, Why You Hear What You Hear- An…, 79
• A horn amplifies sound without increasing diaphragm motion #expands (0.75) — Eric J. Heller, Why You Hear What You Hear- An…, 539