Use this calculation for a first-order acoustics estimate when the stated geometry, propagation model, averaging convention, reference quantity, and SI units match the measurement or design problem.

Reverberation Seconds

A finite measured or assumed value greater than or equal to 0, expressed in s.

Room Cubic Meters

A finite measured or assumed value greater than or equal to 0, expressed in m3.

The implemented rule is: Approximate Schroeder transition frequency 2000 sqrt(RT60/V) for room volume in m³ and reverberation time in seconds.^[1]

Transition Hertz

The calculated transition hertz, expressed in Hz.

This is an idealized calculation rather than a complete acoustic simulation or measurement. Reflections, boundary conditions, directivity, damping, frequency dependence, near-field behavior, background noise, transducer response, temperature, humidity, and geometry can change a real result.

Confirm important results with calibrated measurements or a model that includes the actual geometry, materials, boundaries, source directivity, and frequency-dependent losses. Preserve the reference quantity and weighting whenever a result is expressed in decibels.

• Axial Mode Frequency

  Rectangular-room axial mode frequency along one dimension for a positive integer mode order.

• Oblique Mode Frequency

  Rectangular-room mode frequency for three nonzero axial orders and dimensions.

• Tangential Mode Frequency

  Rectangular-room mode frequency for two nonzero axial mode orders and dimensions.