Sengpiel Audio

About this resource

Sengpiel Audio is a reference and calculator resource for sound engineering rather than a software workstation or equipment brand. Its English calculation index links sound-pressure and intensity conversions, microphone sensitivity, voltage levels, electrical power, filter behaviour and recording topics. That breadth makes it useful when a setup question crosses from room acoustics into gain structure, signal connections or the terminology used in specifications. ^[1]

The room-mode calculator is a concrete example of its explanatory approach. It asks for rectangular-room dimensions and distinguishes axial, tangential and oblique standing-wave patterns. The text explains the corresponding involvement of opposing surfaces and warns that non-rectangular or open-plan spaces are harder to calculate. It also notes the effects of furnishings and states that the calculator does not include all eigenfrequencies and is not intended for scientific calculations. ^[2]

Useful starting points include the decibel calculator, dBu/dBV conversions, frequency-to-wavelength tools and the room-mode page. Each addresses a different quantity; the surrounding explanations help prevent confusing sound pressure with intensity or voltage gain with power gain. The resource should be understood as formula-based study and estimation, not a substitute for measuring an actual room or a system that automatically applies equalisation. ^{[1] [2]}