Competitors are classified by the nature of the components in their sound system and the extent to which their vehicle has been modified. For specific limitations regarding vehicle modifications for each division, refer to Sections 3-6 later in this rulebook.
2-1
The dBDRA considers speakers with advertised maximum diameters of 10 inches or larger to be woofers.
2-2
All of the woofers in a vehicle (10 inches and larger) will be counted when determining what class a competitor should compete in.
Additional Guidelines:
Every woofer in an Isobaric or Compound configuration shall be counted.
Hidden woofers (such as those found in Bandpass enclosures) shall be counted.
Passive radiators, ports, and vents are not considered to be woofers, and therefore will not be counted as such.
If the largest speaker in the contestant's sound system is smaller than 10 inches (25.4 cm) in diameter, then all of the speakers that are being used to produce bass shall be treated as woofers.
2-3
"Token" woofers are strictly prohibited. If a competitor has installed woofers in such a manner as to circumvent the competitor classification system, the competitor may be re-classified or disqualified at the sole discretion of the head judge.
Example:
A competitor who normally competes in the Super Street 1-2 class shows up at an event and decides that his normal class is too competitive for his taste. In an effort to circumvent the competitor classification system and move up into the Super Street 3-4 class, the competitor borrows 2 woofers and then lays them in the back of his vehicle. Now, there are a total of 4 woofers in the vehicle, even though the 2 woofers he just "installed" are not a legitimate part of the sound system. Activities such as this are strictly prohibited.
2-4
Each competition vehicle may compete in one, and only one class at each dB Drag Racing event.
Additional Guidelines:
Competitors may not enter the same vehicle in more than one class at a dB Drag Racing event.
Competitors may enter multiple vehicles at a dB Drag Racing event provided that no two vehicles are entered into the same class and provided that each vehicle is entered under a unique compeitor name.
Competitors may not send out a "fleet" (2 or more) of vehicles to compete in an attempt to circumvent the point's accrual requirements for the World Finals.
Competitors must accompany their vehicle at each event. In other words, a competitor may not send his vehicle to an event with a friend in order to compete while he stays at home.
2-5
This section contains basic information regarding competitor classification based on the equipment installed in the contestant's vehicle. For specific limitations regarding vehicle modifications for each division, refer to Sections 3-6 later in this rulebook. For a quick overview of each class please refer to the dB Drag Racing Class Matrix.
The standard classes for dB Drag Racing are as follows...
Street Stock Division
The Street Stock class is intended for normal, after market auto sound systems. The equipment permitted in these classes is restricted to the "consumer-grade" components that are sold everyday at auto sound retail establishments. Veteran contestants, competition teams, and "hardcore" competitors are encouraged to compete in one of our other divisions.
Only consumer grade components may be used.
Any number of amplifiers may be used. However, the maximum total RMS power in the system must be 2000 watts or less.
Woofers with cast frame baskets are prohibited.
The maximum voice coil diameter is 2.5 inches.
Vans, CRX's, Panda's (or Panda derivatives), and commercial vehicles are prohibited from competing in the Street Stock Division.
Contestants must play music when competing. Test tones (or songs containing test tones) are prohibited.
Street Stock Class - 2000 Watts maximum total RMS power. A maximum of 4 conductors may be attached to each woofer. (Please see the definitions section for more detail regarding conductors.)
One 15-inch woofer
OR a maximum of two 12-inch woofers
OR a maximum of three 10-inch woofers
OR a maximum of four 8-inch woofers
Street Division
The Street classes are intended as a migration path for more advanced contestants. The rules in this division are stricter than those found in the Street Stock division and a greater variety of products (including "competition-grade" components) may be used.
Cargo vans and commercial vehicles are prohibited from competing in the Street Division.
Amplifiers used for non-subwoofer applications will not be counted.
Amplifiers that are constructed in such a way as to circumvent the amp quantity limitation may be prohibited from use in this division or may count as multiple amplifiers. (Please see Section 14 for more information on amplification.)
Street A Class - A maximum of 1 subwoofer amplifier may be used. A maximum TOTAL of 2 electrical conductors may be used to connect the amplifier to the woofer(s). (Please see the definitions section for more detail regarding conductors.)
One 12-inch woofer
OR a maximum of two 10-inch woofers
OR a maximum of three 8-inch woofers
Street B Class - A maximum of 1 subwoofer amplifiers (or 2 externally bridged monoblock amplifiers) may be used. A maximum TOTAL of 2 electrical conductors may be used to connect the amplifier(s) to the woofer(s).
One 15-inch woofer
OR a maximum of two 12-inch woofers
OR a maximum of three 10-inch woofers
OR a maximum of four 8-inch woofers
Street C Class - A maximum of 2 subwoofer amplifiers (or 4 externally bridged monoblock amplifiers) may be used. A maximum TOTAL of 4 electrical conductors may be used to connect the amplifier(s) to the woofer(s).
One 18-inch woofer
OR a maximum of two 15-inch woofers
OR a maximum of four 12-inch woofers
OR a maximum of six 10-inch woofers
OR a maximum of eight 8-inch woofers
Street Max Division
The Street Max class retains the "normal use" restrictions associated with the Street division while allowing the contestant to utilize a "wall" in his or her installation.
Street Max Class - 1-4 Woofers. A maximum of 2 subwoofer amplifiers (or 4 externally bridged monoblock amplifiers) may be used. A maximum TOTAL of 4 electrical conductors may be used to connect the amplifier(s) to the woofer(s).
Additional Guidelines for the Street Max Division:
Amplifiers used for non-subwoofer applications will not be counted.
Amplifiers that are constructed in such a way as to circumvent the amp quantity limitation may be prohibited from use in this division or may count as multiple amplifiers. (Please see Section 14 for more information on amplification.)
Super Street NW Division
The Super Street NW class is designed for those contestants wishing to maximize the equipment in their installs without building a wall or moving into the Super Street or Extreme divisions.
Super Street NW Class - 1+ Woofers. A maximum of 4 subwoofer amplifiers (or 8 externally bridged monoblock amplifiers) may be used. A maximum TOTAL of 8 electrical conductors may be used to connect the amplifier(s) to the woofer(s). A maximum of 4 conductors may be attached to each woofer
Additional Guidelines for the Super Street NW Class:
Amplifiers used for non-subwoofer applications will not be counted.
Amplifiers that are constructed in such a way as to circumvent the amp quantity limitation may be prohibited from use in this division or may count as multiple amplifiers. (Please see Section 14 for more information on amplification.)
Super Street Division
The Super Street classes are designed for contestants wishing to maximize the equipment in their vehicles without making the structural modifications required for the Extreme division. It is not uncommon to find "veteran", "hardcore" contestants participating in these classes. "Competition-grade" components are normally used for Super Street.
Super Street 1-2 Class - 1-2 Woofers. A maximum of 4 conductors may be attached to each woofer
Super Street 3-4 Class - 3-4 Woofers. A maximum of 4 conductors may be attached to each woofer
Super Street 5+ Class - 5+ Woofers. A maximum of 4 conductors may be attached to each woofer
Extreme Division
The Extreme classes are intended for contestants wishing to take their systems to the very limits of technology and beyond. Typically, only the most veteran contestants participate in these classes on a professional level.
Extreme 1 Class - 1 Woofer. A maximum of 4 conductors may be attached to each woofer
Extreme 2+ Class - 2+ Woofers. A maximum of 4 conductors may be attached to each woofer
Optional Classes
The following classes are not offered at the World Finals.
Freestyle - This class is intended for "first-time" contestants only. Typically, there are no rules in this class except that once you win, you must move up into one of the standard classes listed above.
Monster - This class is intended as an "exhibition" class only.
dB Drag Racing Class Matrix Reference
Class
Normal Use
Vehicle Mods
Woofer Qty
Walls
Street Stock
B-Pillar Forward
Yes
1-4 *
No
Street A
Everywhere
No
1-3 *
No
Street B
Everywhere
No
1-4 *
No
Street C
Everywhere
No
1-8 *
No
Street Max
B-Pillar Forward
No
1-4
OK
Super Street NW
B-Pillar Forward
No
1+
No
Super Street 1-2
B-Pillar Forward
Yes
1-2
OK
Super Street 3-4
B-Pillar Forward
Yes
3-4
OK
Super Street 5+
B-Pillar Forward
Yes
5+
OK
Extreme 1
Exempt
Yes
1
Required
Extreme 2+
Exempt
Yes
2+
Required
Class
Max Conductors
Max Amps
Podium
Street Stock
4 per sub
2KW Max Total
Yes
Street A
2 Total
1
No
Street B
2 Total
1 *
No
Street C
4 Total
2 *
No
Street Max
4 Total
2 *
Yes
Super Street NW
8 Total *
4 *
Yes
Super Street 1-2
4 per sub
Unlimited
Yes
Super Street 3-4
4 per sub
Unlimited
Yes
Super Street 5+
4 per sub
Unlimited
Yes
Extreme 1
4 per sub
Unlimited
Yes
Extreme 2+
4 per sub
Unlimited
Yes
Class
Battery Qty
Battery Size
Battery Box
Capacitor Qty
Street Stock
1
Standard 650 in^3
No
Unlimited
Street A
1
Standard 650 in^3
No
1F
Street B
1
Standard 800 in^3
No
1F
Street C
2
Standard 800 in^3
No
2F
Street Max
1
800 in^3
No
1F
Super Street NW
Unlimited
Unlimited
No
Unlimited
Super Street 1-2
Unlimited
Unlimited
Yes
Unlimited
Super Street 3-4
Unlimited
Unlimited
Yes
Unlimited
Super Street 5+
Unlimited
Unlimited
Yes
Unlimited
Extreme 1
Unlimited
Unlimited
Yes
Unlimited
Extreme 2+
Unlimited
Unlimited
Yes
Unlimited
Class
Alternator Qty
Max Volts
Vehicle Run
Street Stock
1
12 (16 Max)
Yes
Street A
-
12 (14 Max)
No
Street B
-
12 (14 Max)
No
Street C
-
12 (14 Max)
No
Street Max
-
12 (14 Max)
No
Super Street NW
2
16 (18 Max)
Yes
Super Street 1-2
2
18 Max
Yes
Super Street 3-4
2
18 Max
Yes
Super Street 5+
2
18 Max
Yes
Extreme 1
Unlimited
18 Max
Yes
Extreme 2+
Unlimited
18 Max
Yes
Class Matrix Notes
Street Stock – 1-15 or 2-12’s or 3-10’s or 4-8’s / Maximum 2000 Watts RMS Total Amplification
Street A – 1-12 or 2-10’s or 3-8’s / Maximum of 1 amp – 2 Conductors total between amp rack and sub enclosure
Street B – 1-15 or 2-12’s or 3-10’s or 4-8’s / Maximum of 1 amp (or 2 monoblock amplifiers) – 2 Conductors total between amp rack and sub enclosure
Street C – 1-18 or 2-15’s or 4-12’s or 6-10’s or 8-8’s / Maximum of 2 amps (or 4 monoblock amplifiers) – 4 Conductors total between amp rack and sub enclosure
Street Max –Maximum of 2 amps (or 4 monoblock amplifiers) – 4 Conductors total between amp rack and sub enclosure
Super Street NW – Maximum of 4 amps (or 8 monoblock amplifiers) - 8 Conductors total between amp rack and sub enclosure. Maximum 4 conductors per sub
Glossary of Terms
Alts – Number of alternators permitted
Amps – Maximum number of physical amplifiers permitted
Battery Box – Battery box permitted
Battery Qty – Maximum number of batteries permitted
Battery Size – Physical size limits for each battery in cubic inches
Caps – Number of Farads permitted
Maximum Conductors – Maximum number of electrical conductors between the amplifier(s) and the sub enclosure. A normal speaker wire is composed of two conductors; 1 for positive and 1 for negative.
Normal Use – Normal use restriction applies
Podium – Podium use permitted
Run – Vehicle may be running during competition
Standard Battery – 12-volt, 6-cell (connected in series), lead-acid or gel-type battery.
