http://www.dbdrag.com/dbdrag/rules/2009/rules.asp?Org_ID=1&season=2009&section=2
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 Division - 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.
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
Additional Guidelines for 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 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.