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.

Pressure Pascals

A finite measured or assumed value, expressed in Pa.

Impedance Rayls

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

The implemented rule is: Particle velocity amplitude for a traveling plane wave from pressure amplitude and characteristic impedance.^[1]

Velocity Meters Per Second

The calculated velocity meters per second, expressed in m/s.

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.

• Acoustic Impedance Medium

  Characteristic specific acoustic impedance rho*c for a uniform medium.

• Bulk Modulus From Sound Speed

  Adiabatic bulk modulus rho*c² from medium density and sound speed.

• Absorption Required For Target Rt

  Metric Sabine equivalent absorption area required for a target RT60: 0.161V/T.