Panel vibration does not prove audible sound is radiated
Evidence
Much ado has been made about mechanical resonances in loudspeaker enclosures, for good reason. They are large surfaces and can radiate significant sound if they move. When loudspeakers are measured in an anechoic chamber, or equivalent, and examined through 360° of rotation, any such radiated sound is captured, and, if significant, its presence will be noted. However, accelerometer measurements of the mechanical movement at a point on an enclosure surface is not definitive evidence of effectively radiated sound energy, or of its audibility. Some resonant modes in panels exhibit similar areas simultaneously moving in opposite directions. There is movement, but little sound is radiated. — Toole, Floyd E, Sound reproduction- the acoustics and…, 106
Categorization
Category: Contrarian or Surprising Claims
- QUESTION: Implies accelerometer-based enclosure testing can be misleading — worth chasing the scanning-interferometry method that identifies actually-radiating modes.
Related
- Panel movement alone does not indicate audibly radiated sound. (similarity 0.89)
- Soundboards deliberately avoid isolated high-Q resonances (similarity 0.79)
Broader Connections
- Adjacent opposite-phase regions on a vibrating surface cancel their radiated sound
#corroborates(0.95) — Eric J. Heller, Why You Hear What You Hear- An…, 676