The violin bridge’s carved resonance boosts treble frequencies to shape timbre

Evidence

Indeed, the violin could use some boost in the treble region, 2000 to 3000 Hz. The bridge is carved and positioned to accomplish this. Energy is constantly being supplied by the bow, so lowering the impedance of the bridge by creating a broad resonance pumps more energy into that part of the frequency spectrum, affecting the violin’s timbre in a desirable way, compensating for perceived deficiencies. The bridge is a gatekeeper feeding the energy into the instrument, with its own deliberate resonance, creating the bridge hill (figure 18.9): the gatekeeper resonance effect. — Eric J. Heller, Why You Hear What You Hear- An…, 1770

Categorization

• DEFINE: Introduces ‘the bridge hill’ and ‘gatekeeper resonance effect’ as named phenomena in violin acoustics.
• XREF: Connects to the book’s own sculpting principle and impulse-response framework from earlier chapters. — connects to: Body resonances aligned to open-string fundamentals give each string instrument its timbre — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1126