Passive Radiator Excursion Graph

How to read passive radiator excursion and PR Xmax reference lines.

Direct answer

The PR excursion graph shows how far the passive radiator moves across frequency in passive-radiator enclosures.

What it measures

• Passive radiator excursion in millimeters.
• PR Xmax reference lines where the selected passive radiator provides that value.
• Movement created by tuning mass, box volume, and input power.

Why it matters

• A passive radiator can run out of movement even when the active driver looks safe.
• It replaces the port velocity check for passive-radiator designs.
• It helps decide whether more radiator area, more units, or different tuning is needed.

How to read it in 00 Simulator

• Only expect data for passive-radiator enclosures.
• Compare the curve with PR Xmax and with the driver excursion graph.
• Watch for large peaks near or below tuning that need filtering or a different alignment.

What good, warning, and bad usually look like

Good

PR excursion stays below its target through intended playback levels.

Warning

PR excursion is close to Xmax near tuning but may be manageable with power or filter changes.

Bad

PR movement exceeds the radiator limit before the active driver or thermal limits become relevant.

Common false conclusions

• A safe active driver does not mean the passive radiator is safe.
• Adding mass to tune lower can increase excursion demand.
• PR excursion should not be compared to port velocity as the same physical quantity.

App behavior notes

• The UI graph id is `pr-excursion`; the internal graph key is `prExcursion`.
• The graph filters to passive-radiator enclosure results.