Reference

Reference · Tiles

TILEHORNSPA RMS

Horn Pressure

Horn Pressure reads the acoustic pressure inside the horn at the station you choose. Use it to locate pressure build-up and understand how the path loads the driver.
Shows
RMS acoustic pressure in Pa, or its phase, at a chosen station inside the horn.
Healthy when
The station and mode are the ones you mean; a pressure peak is interpreted alongside flow and SPL.
If it is not
Compare another station and inspect particle velocity before changing geometry.

The tile#

Horn Pressure

Pa RMS

  • Main H1 throat
  • Main H2 mouth
  • Main H4 mouth
Tapped-horn example at 100 W, half space, 1 m. Stations are measured from the closed end. Simulated when this page was built.

In the tapped-horn example the closed-end station peaks at 1,485.4 Pa RMS, while the mouth peaks at 178.7 Pa RMS. Those maxima occur at different frequencies. Open the example and compare stations at the same frequency with the hover readout.

Choose a location above the plot. The initial location is the first span’s throat. Magnitude shows Pa RMS; Phase shows pressure phase relative to the electrical drive. This is local pressure, not the SPL at the listening position.

High pressure need not mean fast air#

A closed end can support a large pressure variation while its volume flow is essentially zero. At other stations a narrow passage can have much more air motion. Read Horn Particle Velocity at the same location before drawing conclusions about air speed.

Change or observationInterpretation
More input powerPressure rises with drive amplitude in the linear model.
Choose another stationThe reading changes location; the horn itself is unchanged.
Change length, flare or stuffingChanges resonances and acoustic loading; check SPL and excursion as well.
A comparison enclosure has no matching stationIts curve is left out; it is not a zero-pressure result.

What to try#

TryWhat it changes
Choose a stationCompare the throat, a constriction and the mouth; the default is the first span’s throat.
Compare pressure with flowHigh pressure can occur where flow is small. Read Horn Particle Velocity at the same station.

Ask your AI#

Ask your AI

Using 00 Simulator, simulate my horn at its current power and compare pressure and particle velocity at the throat, a narrow station and the mouth. Explain the largest pressure peak and identify its frequency without treating it as listening SPL.
or open it inClaudeChatGPT

Connect your assistant so it can open your designs.

DiagnosticsHorn Particle VelocityHorn Acoustic ImpedanceStuffing