SOUND OFF

BoomKings are back for Brisbane Jamboree 2026! 🔊🔥

Get ready for earth-shaking bass and fierce competition as some of Australia's loudest and toughest sound systems go head-to-head at Willowbank Raceway. Whether you're competing or just want to experience the power of extreme car audio, the BoomKings Sound Off is the place to be.

Think your setup has what it takes? Enter now and join the battle for sound supremacy at Jamboree.

SATURDAY AND SUNDAY - AUGUST 8/9TH

Pre-Entry Fee - $130 and includes:

• Entry for 1 person
• Vehicle judging
• Option of Discounted Entry Tickets

Registration will be between 7-9am.

PRE-ENTRIES OPEN APRIL 23RD 2026 AND CLOSE JULY 29TH 2026

CLASSES:

• 1st Timers
• Steppin' It Up
• Feeling Trunk
• Regulars
• Big Boiiz
• OutLaws
• OutLows
• Sq Novice
• Sq Pro

RULES:

Sq Novice:
No shop built/sponsored cars

Sq Pro:
Open

SQ Judging Track List
Track List Link

1st Timers: (Music Only):
Class is for people that have not entered a Audio Competition before

• Power source: 2x batteries or banks
• Amp power limit: 2,500wrms.
• Subwoofer limit: 2
• Db Limit of 145Db (However if you go over 145db you'd be bumped into the next class)
• No burps/tones
• All equipment must be behind the B pillar and rear seats can be folded but not removed. For hatchback, sedans, suv and wagons, all equipment must be below the window line.
• No external equipment

Steppin' It Up: (Music Only):
Class for people who have come back to be louder or been bumped from 1st timers for being too loud!

• Power source: 3x batteries or banks
• 150db limit
• Amp power limit: 3,500wrms.
• Subwoofer limit: 2
• No burps/tones
• All equipment must be behind B pillar and rear seats can be folded but not removed, for hatchbacks, sedans, suv, and wagons, all equipment must be below the window line
• No external equipment

Feeling Trunk: (Music Only):
Class is for SEDAN vehicles only with their car audio equipment installed behind the B Pillar and below the window line excluding enclosure which MUST be in the trunk

• Power source: 4x batteries or 4 banks
• Amp power limit: 7,500wrms
• Subwoofer limit: 4
• No burps/tones
• All car audio equipment must be installed behind the B Pillar and below the window line
• No external equipment

Regulars: (Music Only):
Class is for people that usually attend sound comps and for vehicles with their car audio equipment installed behind the B Pillar and with a 330mm clearance between enclosure and interior roof liner.

• Max amp power 10,000wrms
• No subwoofer limitations
• Power source: 6x batteries or 6x banks (maximum of 2 batteries/banks are allowed in the stock location, all other batteries must be behind the B Pillar)
• No burps/tones
• Rear seats can be removed
• No external equipment
• All car audio equipment must be installed behind the B Pillar

Big Boiiz: (Music Only):
Class is for BIG BOIIZ and vehicles with their car audio equipment installed behind the B Pillar with very few limits.

• Max amp power 15,000wrms
• No subwoofer limitations
• No limit to the number of batteries
• No "Walled" cars.
• Non sealed walled cars allowed (50mm clearance between wall and both sides of B pillar)
• Front/Rear seats can be removed
• No external equipment
• No BURPS
• All car audio equipment must be installed behind the B Pillar

OutLaw: (Burp/Tones/Music):
Class is for some serious setups - Burp, Walled, Extreme SPL cars

• No amp power limitations
• No subwoofer limitations
• No battery limitations
• No voltage limitations
• External equipment allowed

OutLow: (Music Only):
Same rules as OutLaw class but...

• No burps
• Capped off at 30hz and 155db
• If both competitors score a 155db while in the lanes, the winner will be the one at the lowest hz or if both are at the same hz, a 5min charge up and rematch will take place and the winner will be the loudest db reading at the lowest hz

GENERAL RULES:

• 60hz Limit in all classes excluding OutLow
• Max 2000rpm when in lanes
• 14.9v max for 1stTimers, Steppin it up
• 18.9v max for Feeling Trunk, Regulars & BigBoiiz
• Amp power clamping in all classes excluding outlaw/low
• All wires to be labelled and accessible for judges to clamp in all classes
• Photos of equipment that cannot be accessible
• Front/back(can be folded down) seats cannot be removed in 1st timers, Steppin it up
• Front/back seats can be removed in Feeling Trunk, Regulars and BigBoiiz
• Only 1x Battery or bank in factory location and others behind the B pillar for 1st Timers, Steppin it up
• No BURPING in all classes excluding Outlaw
• Windows down allowed in all classes
• 330mm from sub enclosure to lowest point of roof applies in 1stTimers, Steppin it up
• No DC to DC charging in 1st timers
• Open doors in FINALS only
• 2x Bye runs a year
• NO Team members or nominated personal can touch, hold etc a competitors car while in the lanes
• No Speeding
• Alcohol/Drug free event
• No poor sportsmanship welcome (run your system not your mouth)
• Equipment can be changed only if it fails to perform and replacements to still meet class rules.
• Music must be played at least 10sec when in lanes
• DSP (external or built in to headunit) is allowed in SQ novice