Chaos
- Peak (Burp)
- Up to 53 Hz
- 601–950 sq in
- Up to 20,000 W
601 to 950 sq in of cone area and up to 20,000 W of max rated power in a wall build. More than 20,000 W moves you up to Beast. Maximum frequency is 53 Hz peak; if the test peaks higher, you are moved to a Pro class.
World record163.02 dBZack Fields, 2026- Class type
- Wall
- Build type
- Wall
- Format
- Peak (Burp). The highest reading the meter catches in one short hit, usually a single burp of a tone or a note of music.
- Frequency
- Peak max 53 Hz (else moved to a Pro class)
- Cone area
- 601–950 sq in
- Power
- Up to 20,000 W
- Over the power limit
- Moves up to Beast, where power is unlimited
- Over the frequency limit
- The judge can move the score to Unleashed Wall, or you run again
- Sensor and vehicle
- In front of front seat; windshield 1 ft from A pillar and 1 ft up from dash if enclosure passes the B pillar
- Scoring
- Peak Hold SPL
- Extreme builds
- Not allowed