Bass Boxing Rules
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2012 RULES

 

 CLASSES

COMP TYPE

SUBWOOFER CONE AREA LIMITATION (sq. in)

WALLS ALLOWED

MINIMUM OUTSIDE SPEAKER CONE AREA REQUIREMENT

MINIMUM AMP POWER FOR EXTERIOR SPEAKERS

SUBWOOFER / AMP LOCATION

INTERIOR MODS ALLOWED?

BATTERIES

MAX VOLTAGE ALLOWED ENGINE OFF/RUNNING

MAXIMUM RPM

FLYWEIGHT

Music only

1 to 160

No

50 sq. in. or more

100 watt
(50 X 2)

OEM cargo area

No

2 (two)

12.9V/15.5V

2,000

FEATHERWEIGHT

Music only

161 to 260

No

50 sq. in. Or more

150 watt
(75X2)

OEM cargo area

No

2 (two)

12.9V/15.5V

2,000

LIGHTWEIGHT

Music only

261 to 720

No

100 sq. in. or more

200 watt
(100 X 2)

Behind B pillar

Yes

Unlimited

12.9V/15.5V

2,000

SUPER LIGHTWEIGHT

Music only

721+

No

100 sq. in. or more

200 watt
(100 X 2)

Behind B pillar

Yes

Unlimited

12.9V/15.5V

2,000

MIDDLEWEIGHT

Music only

1 to 720

Yes

150 sq. in. or more

300 watt
(150 X 2)

Behind B pillar

Yes

Unlimited

18.0 volts

2,000

HEAVYWEIGHT

Music only

721+

Yes

150 sq. in. or more

300 watt
(150 X 2)

Behind B pillar

Yes

Unlimited

18.0 volts

2,000

FOR REFERENCE ONLY - For complete details of the rules, refer to the IASCA Bass Boxing rule book.

IASCA strongly suggests the use of a fuse on the main power wire for the system.
 

Woofer comparison chart

1 to 160 sq. in. = 3-8s, 2-10s, 1-12
161 to 260 sq. in. = 3-10s, 2-12s, 1-15
261 to 720 sq. in.= 9-10s, 6-12s, 4-15s, 2-18s

Speaker chart

50 sq. in. = 1 pr 6 inch, 1 pr 5x7 or bigger
100 sq. in. = 2 pr 6 inch or bigger
150 sq. in.= 3 pr 6 inch or bigger

refer to woofer conversion chart

 

refer to speaker chart

 

in rule book for more info

 

in rule book for more info

 

 

 

BB front cover.jpg

 

IASCA BASS BOXING is a type of SPL competition (sound pressure level) using full range music as the main judging criteria. Bass Boxing pits several competitors against each other until one competitor prevails as “Champion”. It’s a true test of how a system performs in every day applications.

 

The Qualifying Round is a 30 second round. Competitors are allowed to use any approved, commercially available music. IASCA Judges, using an approved SPL meter, will register the average SPL score during that timeframe. All competitors compete in the qualifying round and the top two contenders with the highest average SPL score in each Bass Boxing Division will move on to the final rounds.

 

Final Rounds - Rounds 1, 2 and 3 pit the top two competitors against each other in an all out, full range musical SPL competition. In these rounds, competitors may once again choose any approved commercially available music. Each Round has specific criteria; please read the General Bass Boxing Rules on the next page for details. These rounds will also last 30 seconds each and the Judges will register the highest average SPL score during that timeframe.

 

In all Bass Boxing competition rounds, the full range of music (not just bass) must be heard cleanly and clearly by everyone, including judges and spectators, so the goal is to build a system that sounds as loud and good outside as it does inside!

 

If this format of competition sounds like fun to you, you’re absolutely right; it is! As a matter of fact, it’s fun for everyone because anyone with an amplifier and a subwoofer can compete in one of our several Bass Boxing Divisions. It’s also fun for the spectators to see these cars perform, so put on your BASS  BOXING “gloves” and have a great time with us!

BB Div and chart.jpg

Pipo 01.jpg

 

 BASS BOXING PROCEDURE
 

QUALIFYING ROUND

 

The QUALIFYING ROUND will determine the top two competitors in each Division; only the top two competitors in each Division will move on to the final rounds. NOTE: Event hosts  have the option of offering as many qualifying round runs as they want to; some event hosts may only offer one round due to time constraints.

 

HOW TO QUALIFY - The competitor has the option of whether they wish to have the vehicle’s doors open or closed during qualifying. The competitor has two minutes from the time they enter the competition lane to get ready to compete. The round lasts 30 seconds during which time the competitor’s highest average SPL score will be recorded. When all qualifying is complete, only the top two competitors with the highest average SPL qualifying score will move on to compete against each other in the Championship Fight.

 

The CHAMPIONSHIP FIGHT

 

The Championship Fight consists of three rounds where the top two qualifiers go against each other for the Title of EVENT CHAMPION. Each Round has certain criteria that must be adhered to; please read carefully:

 

ROUND 1 - In Round 1, the competitor must compete with all vehicle openings (doors, hoods, trunks, etc.) completely closed, however, the crowd must be able to hear full range music outside of the vehicle while it is competing. The use of external speaker pods, or opening panels that house external speaker pods, is allowed. The competitor’s highest average SPL score after 30 seconds will be recorded. NOTE: When panels are opened to expose external speaker pods, the system, pod or vehicle cannot allow any ventilation from the interior of the vehicle to outside in Round 1 of competition (closed door round).

 

ROUND 2 - Round 2 is the same as Round 1, with one exception. In Round 2, the competitor must open one of the vehicle’s front doors (driver or passenger). The competitor’s highest average SPL score after 30 seconds will be recorded. The door that is opened must be opened completely and remain open for the full duration of the 30 second run. Competitors are not allowed to try opening and closing the door during the competition run, in order to achieve a higher SPL score.

 

ROUND 3 - Round 3 is again the same as Rounds 1 and 2, with one exception. In Round 3, both front doors must be open and remain open for the duration of the SPL run. Competitors may also have any other panels opened if they choose, but they are not allowed to try opening and closing any of these panels during the run in an effort to increase SPL. The competitor’s highest average SPL score after 30 seconds will be recorded.

 

DETERMINING THE CHAMPION (WINNER)

 

The Champion (winner) will be determined by adding up each competitor’s scores from Rounds 1, 2 and 3 then dividing that total by the number of Rounds to arrive at an average SPL score for all three rounds (Qualifying Round is not included). The competitor with the highest average score for all three rounds will be declared the Champion.

 

 

 BASS BOXING FAQs

 

 What’s considered “approved, commercially available music?”

 

Commercially available music can mean almost anything, but for the purposes of Bass Boxing rules, it means that the music being used in competition must be purchased through standard retail channels and be available for sale to the general public.

 

The music selected must be approved by the head judge at the event prior to competing.

 

NOTE: Any music used in competition cannot contain any lewd lyrics, foul language or derogatory comments or acts whatsoever. Music that comes with a “Parental Advisory” is not allowed in Bass Boxing competition. IASCA events are designed to be fun for all  ages in a public setting with a positive message; any detraction from that goal will not be acceptable.

 

What is meant by “Full range music being heard clearly”?

 

Over the last number of years, the perception of “car audio” among the general public is “these kids driving down the street at all hours with ‘boom, boom, boom’ coming out of their cars”.

 

We know this perception is skewed, because inside the vehicle, passengers are hearing the whole song, not just the bass. The goal here is to show the public that there’s more to the music in these vehicles than just the ‘boom, boom, boom’.

 

Therefore, in Bass Boxing competition, judges and spectators must be able to hear the whole song outside the vehicle, not just the bass. The positioning of full range speakers of any style or design either on or outside the vehicle, so that the whole song can be heard by everyone, is one of the most important rules.

 

Think of it this way… when competing, you’re putting on a concert for the crowd!

 

What’s the difference between a bass “beat” and a bass “tone”?

 

A bass “beat” is a bass note that continually repeats itself with a gap between each “beat”. This is common in most of today’s music; the beat goes along with the music and is part of the song.

 

A bass “tone” is a constant bass note (or frequency) that is being continually played for the duration of a song and does not  match the “beat” of the music; it is just a constant tone playing in the background and has no bearing on the music being played whatsoever.

 

In Bass Boxing, music with good bass “beats” are allowed, but bass tones are not.

 

GENERAL BASS BOXING RULES

 

1. Competitors must play full range music (full range music means that the bass, mid bass, midrange and high frequency levels are being played at the same output level, evenly represented) and clearly heard outside of the vehicle. The music may contain a “bass beat”, but not a continuous bass tone. Music with sine sweeps, test tones, bass drops, bass bombs, etc. are not allowed. Music CDs with test tones, sweeps, bass drops or bass bombs embedded in the music background (e.g. The IASCA IdBL Max dB3 CD) may be allowed if the tone is not constant and the duration of each tone does not exceed one second in length; check with your IASCA Official to see if the music you wish to play will be allowed.

2. At no time can the bass frequencies of the system overpower the mid bass, midrange and high frequencies, so much so that the vocals and/or others parts of the music cannot be heard clearly by the judges and spectators. If this overpowering occurs there will be a 2 point deduction (per round) from the average score for that round. Each Bass Boxing Division has minimum speaker size and power requirements for external speakers; refer to the Division rules for details.

3. Musical selections must be approved by an IASCA Official and must be socially acceptable. Musical tracks rated with “Parental Advisories”, or musical tracks with lewd or suggestive lyrics are strictly prohibited.

4. The measuring device will be positioned 4 inches up from the top of the dash and 12 inches inward from the passenger side “A” pillar. The Judge must be able to see the measuring device (sensor) from outside the vehicle at all times during the competition run; competitors are not allowed to place any covering (or tinting) on the windshield blocking the Judge’s ability to see the measuring device during competition.

5. Competitor “shows” must also be socially acceptable. Any display that is deemed offensive in nature by the judges will not be allowed and could result in disqualification without recourse. If you are uncertain whether any part of your "show" is appropriate or not, please consult with the Bass Boxing judges for verification as to its compliance.

6. EQUIPMENT FAILURE - Should any competitor experience equipment failure while in the "Bass Boxing ring" prior to competition, they will be allowed 5 (five) minutes to repair the problem. If a competitor experiences a breakdown during competition, the average score they achieve for that round will be official. However, they will be allowed a 5 minute breakdown period between rounds to correct the problem. If the problem cannot be corrected in the 5 minute time period, they can run as they are or receive a score of zero for the following round.

7. If the problem cannot be corrected within the allotted time and the competitor cannot compete in the following rounds, it will be considered a TKO and their opponent will win by default.

8. Bass Boxing Finalists must be ready to compete when called upon by the Bass Boxing Officials. If a competitor fails to appear for the final rounds within five minutes of being called upon, they will be subject to disqualification without recourse, declaring their opponent the Champion by default. Competitors vying for a Bass Boxing World Record may exercise the option to run unopposed in order to attempt to set a Bass Boxing World Record for their Division.

9. Sound systems in Bass Boxing vehicles in the Middleweight and Heavyweight Divisions must be operated from outside the vehicle. All other Divisions have the option of operating the system from inside or outside the vehicle, as long as the vehicle does not exceed 150dB.

10. Any and all Bass Boxing competitors operating the vehicle from inside must wear hearing protection while competing. Competitors who do not wear hearing protection while competing will receive a 1 point deduction per 10 dB step over 100dB for that run.  EXAMPLE -  a competitor achieves 138 dB and is not wearing hearing protection: 1 point for every 10 dB step: STEP 1 - 100to 110dB ( -1 point), STEP 2 - 110 to 120 dB ( -1 point), STEP 3 120 to 130dB ( -1 point), STEP 4 130 to 140 dB ( -1 point)… total 4 point deduction.

11. Flyweight and Featherweight competitors may elect to operate their sound systems from outside the vehicle; however, the source unit must remain positioned in the vehicle in its OEM location until the vehicle enters the competition lane. Once in the competition lane, the competitor may elect to operate the source unit by a remote control device, or remove the source unit from its location and operate it from outside with an extended harness.

12. In final round judging at “show level” competitions, the use of any noise making devices  (e.g. air horns, train horns, etc.) for the purpose of increasing the average SPL for that round is not allowed. In the instance where a noise making device is used, the competitor’s score will be disallowed and they will receive one more chance to register their score. If during the second attempt a noise making device is used again, the competitor will receive a score of zero for that round, no exceptions.

13. A maximum of 2 people per door (competitors and co-pilots included) are allowed to be used to partially “block” or “cover” the door opening of the vehicle during testing. People who are “blocking” or “covering” the opening may not position themselves directly in the opening to seal off the interior as if the door was closed (see figure below). Competitors are allowed up to six (6) people (co-pilots) to assist them in the set up for competition.

14. Competitors are not allowed to cover up or tape any vents or openings in the vehicle for the purpose of increasing SPL. Vehicles found to have any openings covered or taped up before or during testing will receive a score of zero.

15. Competitors are prohibited from obstructing the judge’s view of the measuring device during testing.

16. Cone area is measured by the cumulative square inches of subwoofer cone surface; for round woofers, determine the cone area by using the chart in this rule book or use the following formula - Radius squared time Pi (3.14). For square woofers, multiply the length of two connecting sides for total cone area per woofer. Then, add the total cone area from each woofer together for the total.

17. Nothing in the vehicle may interfere with the correct placement of the measuring device and its placement jig.

 

Bass Boxing Divisions classify competitors by the cumulative amount of square inches of subwoofer cone area and the degree of modifications to their vehicles. This ensures that competitors are pitted against others fairly. To see which Bass Boxing Division your system fits into, consult the Cone Area Classification Chart on page 3 for the total square inches of your subwoofers and correspond it with the Bass Boxing Division Chart.

 

 door blocking.jpg

 

 

A NOTE ABOUT EXTERNAL (OUTSIDE) SPEAKERS

 

The concept of external speakers in Bass Boxing competition is so the spectators can hear and enjoy the music like you do when driving your vehicle. Traditional SPL competitions usually don’t involve the spectators and show them how well your system is built, so by playing clean, clear music shows them you appreciate the mids and highs as much as the bass your system can deliver.

 

Those who are not familiar with car audio only understand what they hear, like the “boom, boom, boom” of high end car audio systems driving down the street; they don’t realize that inside the vehicle, high quality, full range music is playing and can be clearly heard. The goal with external speakers is to allow them to hear what we hear on the inside. We know music sounds much better with bass, but until someone who is unfamiliar with sound hears that for themselves, they’ll never know.

 

The chart on the next page w shows you the total amount of square inches of cone area in a pair of standard car audio speakers; use it to determine what speakers will fit in your Bass Boxing Division. The rules state a minimum amount of cone area for outside speakers, but there’s no maximum amount, so go crazy if you want to!

 

 

 

speaker chart.jpg

 

 

 

FLYWEIGHT DIVISION (1 to 160 sq. in - no walls)

1 to 160 sq. in = 3 - 8s, 2 - 10s or 1 - 12 inch subwoofer/s

VEHICLE CRITERIA

1. All vehicles in the Flyweight Division must remain OEM stock. External and internal aftermarket add-ons such as body kits, wings, wheels, aftermarket seats, steering wheels or any automotive related cosmetic and performance items not related to the vehicle’s 12 volt electrical or sound system are allowed.

2. Door and kick panel build outs for speaker installations, and custom door panels for cosmetic purposes are allowed for the purpose of increasing sound quality only.  Any speaker installation in a custom door or kick panel build, for the purposes of increasing low frequency SPL, is not allowed.

3. All windows in the vehicle designed by the manufacturer must function as the manufacturer intended them to; nothing may impede their proper operation. OEM glass cannot be replaced with any transparent substitute material.

4. All subwoofers and enclosures must be mounted in the OEM cargo area of the vehicle. Interpretation of the term “cargo area” is at the judges discretion.

5. Vehicles equipped with OEM factory “fold down” rear seats may be folded down during testing.

 

EQUIPMENT CRITERIA

1. Maximum square inches of total subwoofer cone area allowed is 160 sq. in. (equal to 3-8” woofers, 2-10” woofers, 1-12” woofer or a combination of any size woofer equaling, but not exceeding 160 sq. in.)

2. Exterior speakers The system must have a minimum of 50 square inches of full range speaker playing the music externally from the vehicle during competition. Coax, component, horns or pro audio speakers are allowed.

3. Exterior speakers do not have to be permanently mounted to the vehicle, but must be properly and securely mounted when competing; the speakers can be mounted anywhere in, on or around the vehicle, so long as they are able to be clearly heard outside. Exterior speakers not permanently attached to the vehicle must be properly mounted in some type of enclosure.

4. Cardboard boxes, foam molds, sitting on cushions, etc... are not considered an acceptable enclosure for exterior speakers.

5. Exterior speakers must be powered by a minimum 100 watt amplifier. It can be the same amplifier that powers the inside speakers. Source unit power (CD/MP3 player) is not acceptable as the amplifier for the external speakers.

6. There are no minimum or maximum power requirements for interior speakers or subwoofers.

7. All equipment must be commercially available and can not be modified in any way.

8. There is no limit to the amount of amplifiers a competitor may use.

9. Subwoofer walls are not allowed in this Division; any enclosure taller than 25 inches will be considered a wall.

 

ELECTRICAL SYSTEM

        Maximum allowed voltage is 12.9 volts idle (engine off) or 15.5 volts (engine running).

 

BATTERIES

        Two batteries are allowed in this Division. Batteries must be standard 12 volt automotive type batteries. Variations of individual or multiple battery cells equaling 12 volts are not allowed (e.g. two 6 volt batteries connected in series). Batteries are not allowed in the passenger compartment.

 

 

FEATHERWEIGHT DIVISION(161 to 260 sq. in - no walls)

161 to 260 sq. in. = 5 - 8s, 3 - 10s, 2 - 12s, 1 - 15 inch or 1 - 18 inch subwoofer/s

 

 VEHICLE CRITERIA

1. All vehicles in the Featherweight Division must remain OEM stock. External and internal aftermarket add-ons such as body kits, wings, wheels, aftermarket seats, steering wheels or any automotive related cosmetic and performance items not related to the vehicle’s 12 volt electrical or sound system are allowed.

2. Door and kick panel build outs for speaker installations, and custom door panels for cosmetic purposes are allowed for the purpose of increasing sound quality only.  Any speaker installation in a custom door or kick panel build, for the purposes of increasing low frequency SPL, is not allowed.

3. All windows in the vehicle designed by the manufacturer must function as the manufacturer intended them to; nothing may impede their proper operation. OEM glass cannot be replaced with any transparent substitute material.

4. All subwoofers and enclosures must be mounted in the OEM cargo area of the vehicle. Interpretation of the term “cargo area” is at the judges discretion.

5. Vehicles equipped with OEM factory “fold down” rear seats may be folded down during testing.

 

EQUIPMENT CRITERIA

1. Maximum square inches of total cone area allowed is 260 sq. in. (5-8” woofers, 3-10” woofers, 2-12” woofers, 1 - 15” woofer, or a combination of any size woofer equaling, but not exceeding 260 sq. in.)

2. Exterior speakers The system must have a minimum of 50 square inches of full range speakers playing the music externally from the vehicle during competition. Coax, component, horns or pro audio speakers are allowed.

3. Exterior speakers do not have to be permanently mounted to the vehicle, but must be properly and securely mounted when competing; the speakers can be mounted anywhere in, on or around the vehicle, so long as they are able to be clearly heard outside. Exterior speakers not permanently attached to the vehicle must be properly mounted in some type of enclosure.

4. Cardboard boxes, foam molds, sitting on cushions, etc... are not considered an acceptable enclosure for exterior speakers.

5. Exterior speakers must be powered by a minimum 150 watt amplifier. It can be the same amplifier that powers the inside speakers. Source unit power (CD/MP3 player) is not acceptable as the amplifier for the external speakers.

6. There are no minimum or maximum power requirements for interior speakers or subwoofers.

7. All equipment must be commercially available and can not be modified in any way.

8. There is no limit to the amount of amplifiers a competitor may use.

9. Subwoofer walls are not allowed in this Division; any enclosure taller than 25 inches will be considered a wall.

 

ELECTRICAL SYSTEM

        Maximum allowed voltage is 12.9 volts idle (engine off) or 15.5 volts (engine running).

 

BATTERIES

        Two batteries are allowed in this Division.

        Batteries must be standard 12 volt automotive type batteries. Variations of individual or multiple battery cells equaling 12 volts are not allowed (e.g. two 6 volt batteries connected in series). Batteries are not allowed in the passenger compartment.

 

 

LIGHTWEIGHT DIVISION (261 to 720 sq. in - no walls)

261 to 720 sq. in. = 14 - 8s, 9 - 10s, 6 - 12s, 4 - 15 or 2 - 18 inch subwoofers

VEHICLE CRITERIA

1. All vehicles in Lightweight Division must remain OEM stock from the vehicle’s “B” pillar forward. External and internal aftermarket add-ons such as body kits, wings, wheels, aftermarket seats, steering wheels or any automotive related cosmetic and performance items not related to the vehicle’s 12 volt electrical or sound system are allowed.

2. Door and kick panel build outs for speaker installations, and custom door panels for cosmetic purposes are allowed for the purpose of increasing sound quality only.  Any speaker installation in a custom door or kick panel build, for the purposes of increasing SPL, is not allowed.

3. All windows in the vehicle forward of the vehicle’s “B” pillar, designed by the manufacturer must function as the manufacturer intended them to; nothing may impede their proper operation. OEM glass may not be replaced with any transparent substitute material.

4. All subwoofers and enclosures must be mounted behind the B pillar of the vehicle and no part of the enclosure or equipment can extend forward of the B pillar.

5. Vehicles equipped with OEM factory “fold down” rear seats may be folded down during testing.

 

EQUIPMENT CRITERIA  

1. Maximum square inches of total cone area allowed is 720 sq. in. (13-8” woofers, 9-10” woofers, 6-12” woofers, 4 - 15” woofers, or a combination of any size woofer equaling, but not exceeding 720 sq. in.)

2. Exterior speakers The system must have a minimum of 100 square inches of full range speaker playing the music externally from the vehicle during competition. Coax, component, horns or pro audio speakers are allowed. Midrange/tweeter component sets are considered as one pair.

3. Exterior speakers do not have to be permanently mounted to the vehicle, but must be properly and securely mounted when competing; the speakers can be mounted anywhere in, on or around the vehicle, so long as they are able to be clearly heard outside. Exterior speakers not permanently attached to the vehicle must be properly mounted in some type of enclosure.

4. Cardboard boxes, foam molds, sitting on cushions, etc... are not considered an acceptable enclosure for exterior speakers.

5. Exterior speakers must be powered by a minimum 200 watt amplifier. It can be the same amplifier that powers the inside speakers. Source unit power (CD/MP3 player) is not acceptable as the amplifier for the external speakers.

6. There are no minimum or maximum power requirements for interior speakers or subwoofers.

7. All equipment must be commercially available and can not be modified in any way.

8. There is no limit to the amount of amplifiers a competitor may use.

9. Subwoofer walls are not allowed in this Division; any enclosure taller than 25 inches will be considered a wall.

SUBWOOFER ENCLOSURE/S

Enclosures must be mounted behind the vehicle’s “B” pillar and cannot exceed 25 inches in height, including any supports or equipment attached to the enclosure.

ELECTRICAL SYSTEM 

Maximum allowed voltage is 12.9 volts idle (engine off) or 15.5 volts (engine running).

BATTERIES 

There is no limit to the amount of batteries allowed in Lightweight Division. Batteries can be of any size, style or shape. Modified battery “banks” are allowed.

 

SUPER LIGHTWEIGHT DIVISION (721+ sq. in - no walls)

721+ sq. in. = no limit to the amount of subwoofers allowed

VEHICLE CRITERIA

1. All vehicles in Super Lightweight Division must remain OEM stock from the vehicle’s “B” pillar forward. External and internal aftermarket add-ons such as body kits, wings, wheels, aftermarket seats, steering wheels or any automotive related cosmetic and performance items not related to the vehicle’s 12 volt electrical or sound system are allowed.

2. All windows in the vehicle forward of the vehicle’s “B” pillar, designed by the manufacturer must function as the manufacturer intended them to; nothing may impede their proper operation. OEM glass may not be replaced with any transparent substitute material.

3. All subwoofers and enclosures must be mounted behind the B pillar of the vehicle and no part of the enclosure or equipment can extend forward of the B pillar.

4. Vehicles equipped with OEM factory “fold down” rear seats may be folded down during testing.

 

EQUIPMENT CRITERIA  

1. There is no limit to the amount of square inches of subwoofer cone area in Super Lightweight.

2. Exterior speakers The system must have a minimum of 100 square inches of full range speaker playing the music externally from the vehicle during competition. Coax, component, horns or pro audio speakers are allowed.

3. Exterior speakers do not have to be permanently mounted to the vehicle, but must be properly and securely mounted when competing; the speakers can be mounted anywhere in, on or around the vehicle, so long as they are able to be clearly heard outside. Exterior speakers not permanently attached to the vehicle must be properly mounted in some type of enclosure.

4. Cardboard boxes, foam molds, sitting on cushions, etc... are not considered an acceptable enclosure for exterior speakers.

5. Exterior speakers must be powered by a minimum 200 watt amplifier. It can be the same amplifier that powers the inside speakers. Source unit power (CD/MP3 player) is not acceptable as the amplifier for the external speakers.

6. There are no minimum or maximum power requirements for interior speakers or subwoofers.

7. All equipment must be commercially available and can not be modified in any way.

8. There is no limit to the amount of amplifiers a competitor may use.

9. Subwoofer walls are not allowed in this Division; any enclosure taller than 25 inches will be considered a wall.

 

 

SUBWOOFER ENCLOSURE/S

Enclosures must be mounted behind the vehicle’s “B” pillar and cannot exceed 25 inches in height, including any supports or equipment attached to the enclosure.

 

ELECTRICAL SYSTEM 

Maximum allowed voltage is 12.9 volts idle (engine off) or 15.5 volts (engine running).

 

BATTERIES 

There is no limit to the amount of batteries allowed in Super Lightweight Division. Batteries can be of any size, style or shape. Modified battery “banks” are allowed.

 

 

MIDDLEWEIGHT DIVISION (1 to 720 sq. in. - walls allowed)

1 to 720 sq. in. = 14- 8s, 9 - 10s, 6 - 12s, 4 - 15 or 2 - 18 inch subwoofers

VEHICLE CRITERIA

1. Vehicles interiors in the Middleweight Division can be modified in any way with exceptions listed below. 

2. All OEM factory windows in the vehicle may be replaced with any transparent material.

3. Competitors are prohibited from obstructing the judge’s view of the measuring device during testing. 

4. Middleweight Division competitors may add a custom built dashboard in their vehicle. The dashboard height cannot extend any higher than the top of the original OEM dashboard, or 3 inches above the base of the OEM windshield frame. “Base” in this reference means the part of the windshield frame that attaches to the firewall of the vehicle through the width of the vehicle at the joining point.

5. All subwoofers and enclosures must be mounted behind the B pillar of the vehicle and no part of the enclosure or equipment can extend forward of the B pillar.

 

EQUIPMENT CRITERIA

1. Maximum square inches of total cone area allowed is 720 sq. in. (13-8” woofers, 9-10” woofers, 6-12” woofers, 4 - 15” woofers, or a combination of any size woofer equaling, but not exceeding 720 sq. in.)

2. Exterior speakers The system must have a minimum of 150 square inches of full range speaker playing the music externally from the vehicle during competition. Coax, component, horns or pro audio speakers are allowed.

3. Exterior speakers do not have to be permanently mounted to the vehicle, but must be properly and securely mounted when competing; the speakers can be mounted anywhere in, on or around the vehicle, so long as they are able to be clearly heard outside. Exterior speakers not permanently attached to the vehicle must be properly mounted in some type of enclosure.

4. Cardboard boxes, foam molds, sitting on cushions, etc... are not considered an acceptable enclosure for exterior speakers.

5. Exterior speakers must be powered by a minimum 300 watt RMS amplifier. It can be the same amplifier that powers the inside speakers. Source unit power (CD/MP3 player) is not acceptable as the amplifier for the external speakers.

6. There are no minimum or maximum power requirements for interior speakers or subwoofers.

7. All equipment must be commercially available and can not be modified in any way.

8. There is no limit to the amount of amplifiers a competitor may use.

9. Subwoofer walls are allowed in this Division; any enclosure taller than 25 inches is considered a wall.

 

SUBWOOFER ENCLOSURE/S

        Walls are allowed in Middleweight/Heavyweight Divisions.

 

ELECTRICAL SYSTEM

        Maximum allowed voltage (engine running or off) is 18.0 volts.

 

BATTERIES

        There is no limit to the amount of batteries allowed in Middleweight Division. Batteries can be of any size, style or shape. Modified battery “banks” are allowed, but the total voltage cannot exceed 18 volts, with the vehicle running or not.

 

 

HEAVYWEIGHT DIVISION (721+ sq. in. - walls allowed) 

721+ sq. in. = no limit to the amount of subwoofers allowed

VEHICLE CRITERIA

1. Vehicles interiors in the Heavyweight Division can be modified in any way with exceptions listed below. 

2. All OEM factory windows in the vehicle may be replaced with any transparent material.

3. Competitors are prohibited from obstructing the judge’s view of the measuring device during testing. 

4. Heavyweight Division competitors may add a custom built dashboard in their vehicle. The dashboard height cannot extend any higher than the top of the original OEM dashboard, or 3 inches above the base of the OEM windshield frame. “Base” in this reference means the part of the windshield frame that attaches to the firewall of the vehicle through the width of the vehicle at the joining point.

5. All subwoofers and enclosures must be mounted behind the B pillar of the vehicle and no part of the enclosure or equipment can extend forward of the B pillar.

 

EQUIPMENT CRITERIA

1. Minimum square inches of total cone area allowed is 721 sq. in. (14-8” woofers, 10-10” woofers, 7-12” woofers, 5 - 15” woofers, or more, or a combination of any size woofers exceeding 720 sq. in.)

2. Exterior speakers -  The system must have a minimum of 150 square inches of full range speaker playing the music externally from the vehicle during competition. Coax, component or pro audio speakers are allowed.

3. Exterior speakers do not have to be permanently mounted to the vehicle, but must be properly and securely mounted when competing; the speakers can be mounted anywhere in, on or around the vehicle, so long as they are able to be clearly heard outside. Exterior speakers not permanently attached to the vehicle must be properly mounted in some type of enclosure.

4. Cardboard boxes, foam molds, sitting on cushions, etc... are not considered an acceptable enclosure for exterior speakers.

5. Exterior speakers must be powered by a minimum 300 watt RMS amplifier. Source unit power (CD/MP3 player) is not acceptable as the amplifier for the external speakers.

6. There are no minimum or maximum power requirements for interior speakers or subwoofers.

7. All equipment must be commercially available and can not be modified in any way.

8. There is no limit to the amount of amplifiers a competitor may use.

9. Subwoofer walls are allowed in this Division; any enclosure taller than 25 inches is considered a wall.

 

SUBWOOFER ENCLOSURE/S

        Walls are allowed in Heavyweight Division.

 

ELECTRICAL SYSTEM

        Maximum allowed voltage (engine running or off) is 18.0 volts.

 

BATTERIES

        There is no limit to the amount of batteries allowed in Middleweight/Heavyweight Division. Batteries can be of any size, style or shape. Modified battery “banks” are allowed, but the total voltage cannot exceed 18 volts, with the vehicle running or not.