dB Drag Racing Class Matrix Reference

Class

Normal Use

Vehicle Mods

Woofer Qty

Walls

Street Stock

B-Pillar Forward

Unlimited

Street Trunk

Trunk Forward

Unlimited*

Street A

Everywhere

1-4*

Street B

Everywhere

1-8*

Street Max

B-Pillar Forward

1-4

Super Street NW

B-Pillar Forward

Unlimited

Super Street 1-2

B-Pillar Forward

1-2

Super Street 3-4

B-Pillar Forward

3-4

Super Street 5+

B-Pillar Forward

5+

Extreme

Exempt

Unlimited

Class

Max Conductors

Max Amps

Podium

Pro / Veteran

Street Stock

4 per sub

2000 W Total

Street Trunk

4 per sub

4000 W Total

Street A

2 Total

1*

Street B

4 Total

2*

Street Max

4 Total

2*

Super Street NW

8 Total*

4*

Super Street 1-2

4 per sub

Unlimited

Super Street 3-4

4 per sub

Unlimited

Super Street 5+

4 per sub

Unlimited

Extreme

4 per sub

Unlimited

Class

Battery Qty

Battery Size

Battery Box

Capacitor Qty

Street Stock

1

Standard 800 in^3

2F

Street Trunk

2

Standard 800 in^3

2F

Street A

1

Standard 800 in^3

2F

Street B

2

Standard 800 in^3

2F

Street Max

1

800 in^3

2F

Super Street NW

Unlimited

Unlimited

Unlimited

Super Street 1-2

Unlimited

Unlimited

Unlimited

Super Street 3-4

Unlimited

Unlimited

Unlimited

Super Street 5+

Unlimited

Unlimited

Unlimited

Extreme

Unlimited

Unlimited

Unlimited

Class

Alternator Qty

Max Volts

Vehicle Run

Hi Freq Limit

Street Stock

1

12 (15 Max)

60 Hz

Street Trunk

1

12 (15 Max)

60 Hz

Street A

1

12 (15 Max)

60 Hz

Street B

1

12 (15 Max)

60 Hz

Street Max

1

12 (15 Max)

60 Hz

Super Street NW

Unlimited

18 Max

80 Hz

Super Street 1-2

Unlimited

18 Max

80 Hz

Super Street 3-4

Unlimited

18 Max

80 Hz

Super Street 5+

Unlimited

18 Max

80 Hz

Extreme

Unlimited

18 Max

80 Hz

Class Matrix Notes

Street Stock Division

• 2000 Watts Max

Street Division

• Street Trunk – No woofer quantity limit (Maximum 4 conductors per sub) - No amplifier quantity limit (Maximum 4000 Wrms total) - All amplifiers and woofers must be installed within the trunk
• Street A – 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 B – 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 Class

• Maximum of 2 amps (or 4 monoblock amplifiers) – 4 Conductors total between amp rack and sub enclosure

Super Street NW Class

• 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
• Power - When amplifier power limits are specified, the dBDRA will use the maximum published RMS rating for the amplifier. The dBDRA reserves the right to verify the accuracy of any published rating.
• Run – Vehicle may be running during competition (Maximum RPM is limited to 2000.)
• Standard Battery – 12-volt, 6-cell (connected in series), lead-acid or gel-type battery.
• Vehicle Mods – Structural vehicle modifications permitted
• Volts – Battery voltage (value in parenthesis indicates maximum voltage in the lanes)
• Walls – Walls are permitted
• Woofers – Number of woofers allowed