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 Section 3 later in this rulebook.
The dBDRA considers speakers with advertised maximum diameters of 10 inches or larger to be woofers.
All of the woofers in a vehicle (10 inches and larger) will be counted when determining what class a competitor should compete in.
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.
"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.
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.
Each competition vehicle may compete in one, and only one class at each dB Drag Racing event.
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 competitor name.
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 Section 3 later in this rulebook. For a quick overview of each class please refer to the dB Drag Racing Class Matrix.
The Stock division is intended for the vast majority of auto sound enthusiasts. (Cargo vans and commercial vehicles are prohibited from competing in this division.) All of the classes
in this division have power and total conductor restrictions except for Pro Stock NL. There are no limits to the quantity or size of the woofers used in this division.
Street Stock Eligibility:
Competitors wishing to compete in either of the Street Stock classes must meet all of the following requirements...
The vehicle must be registered, licensed, and insured.
The vehicle must be equipped with a factory installed airbag.
The vehicle must be driven to and from the event.
The vehicle must be owned by the competitor or an immediate family member.
Team names are not permitted unless the competitor's actual name is incorporated into the name. ("Team dBDRAG - Mondo" for example.)
Once a competitor wins a dB Drag Racing Championship (any year, any dB Drag Racing class), then the competitor and the winning vehicle are no longer eligible to participate in either Street Stock class.
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. All of the classes in this division with the exception of Super Street NW and Super Street X have a woofer quantity restriction. There are no power restrictions in this division. class
The Extreme class is intended for contestants wishing to take their systems to the very limits of technology and beyond. Typically, only the most veteran contestants participate in this class and they do so on a professional level.
There are no limits to the quantity or size of the woofers used in this division.
Competitors wishing to compete in the Extreme division must meet at least 3 of the following criteria...