Helmholtz Resonator Calculator

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The total enclosed air volume of the resonator cavity.
The cross-sectional area of the neck or opening.
The physical length of the neck tube or the depth of the hole.
Diameter of a circular neck opening. Used to compute the end correction.
The end correction accounts for the acoustic mass of air just outside the neck. Unflanged (protruding tube): 0.85d. Flanged (flush with baffle): 0.61d.
Speed of sound in air. At 20 degrees C it is 343 m/s. Use 331 m/s at 0 degrees C, or 346 m/s at 25 degrees C.
m/s
Resonance FrequencyBass / low frequency
80.27Hz

The frequency at which the resonator vibrates most strongly.

Wavelength at Resonance4.273m
Effective Neck Length0.0925m
Neck Area0.002m²
Cavity Volume0.01m³
Required Neck Length0.05m
Required Neck Diameter0.05m
End Correction0.0425m
80.27 Hz
Infrasound<20Deep bass20-80Bass80-300Mid-range300-2000High-freq2000+

Resonance at 80.27 Hz

  • This frequency sits in the bass/low-midrange, typical of car intake resonators, studio bass traps, and acoustic panel absorbers.
  • The wavelength at 80.3 Hz is 4.27 m (427 cm). The resonator must be much smaller than this for the lumped-element model to hold.
  • Cavity volume is 10.0 L, in the range of large enclosures, subwoofer boxes, or room-mode traps.

Next stepTo move the resonance up, shorten the neck or widen its area. To move it down, lengthen the neck or reduce the opening area, or increase cavity volume.

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