Horn Diagnostic Graphs

Inspect horn particle velocity, internal pressure, local acoustic impedance, and each radiating mouth or direct output.

Direct answer

The four horn diagnostic graphs show the internal response at a named path location and separate the contributions from every radiating mouth and direct diaphragm output.

What it measures

• Horn Particle Velocity: peak particle speed in m/s at the selected segment end or branch position.
• Horn Pressure: internal RMS pressure in Pa, or its phase in degrees relative to the electrical drive.
• Horn Acoustic Impedance: local pressure divided by volume flow in Pa·s/m³, shown as magnitude, resistance, reactance, or phase.
• Horn Radiating Outputs: separate outlet SPL curves in dB, or phase in degrees, at the configured distance and radiation space, together with their coherent total.

Why it matters

• A smooth external SPL curve can conceal large internal pressure or particle-velocity peaks.
• Separate outputs reveal cancellation between horn mouths or between a rear horn and the direct diaphragm.
• Comparing path locations helps identify where segment geometry or stuffing changes acoustic loading.

How to read it in 00 Simulator

• Select Open horn diagnostics in the horn controls, or add the individual graph tiles from the graph picker.
• Choose a named location. At a driver entry or branch, the two sides can have different volume flow even when pressure is continuous.
• Pressure uses RMS amplitude; particle velocity uses peak amplitude. Acoustic impedance uses signed volume flow toward the stored segment end.
• In Radiating Outputs, the solid curve is the coherent total and the dashed curves are named outputs. Output pressure phasors add; their dB values do not. Phase follows the far-field pressure sum and is undefined at exact cancellation.

What good, warning, and bad usually look like

Good

Internal peaks and outlet summation support the intended operating band at the configured drive level.

Warning

Narrow internal peaks or strong outlet cancellation merit a closer look at the path geometry and stuffing.

Bad

A design depends on an unverified internal air-speed limit or ignores cancellation in its useful band.

Common false conclusions

• These are linear diagnostics, not predictions of turbulence, nonlinear distortion, or compression onset; no box-port warning threshold is applied.
• Acoustic impedance in Pa·s/m³ is not the electrical impedance in ohms. Zero volume flow leaves local acoustic impedance undefined, so that point is omitted.
• A missing location in a comparison enclosure is omitted rather than plotted at zero. Horn diagnostic graphs do not show sealed, vented, bandpass, or passive-radiator results.

App behavior notes

• The graph ids are `horn-particle-velocity`, `horn-pressure`, `horn-acoustic-impedance`, and `horn-radiating-outputs`.
• The graphs require the horn feature. Location and display choices are kept while the current graph session is open; graph tiles and axis settings can be saved with the project.