Boss
- Peak (Burp)
- Up to 53 Hz
- 251–350 sq in
- Up to 5,000 W
251 to 350 sq in of cone area and up to 5,000 W of max rated power in a trunk build. More than 5,000 W moves you up to Godfather. Maximum frequency is 53 Hz peak; if the test peaks higher, you are moved to a Pro class.
World record155.53 dBChaldon Grootboom, 2026- Class type
- Trunk
- Build type
- Trunk
- 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
- 251–350 sq in
- Power
- Up to 5,000 W
- Over the power limit
- Moves up to Godfather, where power is unlimited
- Over the frequency limit
- The judge can move the score to Unleashed Trunk, or you run again
- Sensor and vehicle
- Anywhere in front of OEM front seat; music or tone
- Scoring
- Peak Hold SPL
- Extreme builds
- Not allowed