Full Rule book:  https://bit.ly/2UoOhPp

Facebook Page: https://www.facebook.com/pg/NationalSoundPressureLeague/

For upcoming NSPL and other SPL events: https://bassheadtv.com/category/shows-events/

Unlimited SPL Formats

Beginner – (0-24 inches, 25-48 inches)

Trunk – (0-2500 watts)   Clamped Power

Trunk – (2501-up watts)   Clamped Power

Car/Truck-(0-2500 watts)   Clamped Power

Car/Truck-(2501-up watts)   Clamped Power

No Wall-(0-24 inches, 25-48 inches, 49-up inches)

No Wall (0-5000 watts)   Clamped Power

Wall-(0-30 inches, 31-60 inches, and 61-up inches)

Wall-(0-5000 watts, 5001-10,000 watts)    Clamped Power

Wall Modified-(1-2 woofers, 3-up woofers)

Insane SPL- (1-2 woofers, 3-up woofers)

Hardcore SPL Formats

Trunk Hardcore

Car/Truck Hardcore

No Wall Hardcore (0-24 inches, 25-up inches)

  Wall Hardcore (0-60 inches, 61-up inches)

SPL Eliminator Formats (Music 30 second Average)

The Eliminator format is a SPL competition where the competitor must use music no test tones.  The term-lab will be set to measure the spl in a 30 second average format. 

No Wall (0-24 inches, 25-48 inches, 49-up inches)

Wall (0-60 inches, 61-up inches)

Bass Zones (States)

Northeast  (New York, Connecticut, Pennsylvania, New Jersey, Maryland, Delaware, Washington, D.C.)

New England (Maine, New Hampshire, Vermont, Massachusetts, Rhode Island)

Mid-Atlantic (West Virginia, Virginia, North Carolina, South Carolina, Tennessee, Kentucky)

Southeast (Georgia, Florida, Alabama, Mississippi)

Great Lakes (Ohio, Indiana, Michigan, Illinois, Wisconsin, Minnesota)

North Central (North Dakota, South Dakota, Wyoming, Montana)

Mid-West (Nebraska, Iowa, Missouri, Kansas)

South Central (Oklahoma, Arkansas, Texas, Louisiana)

South West  (New Mexico, Arizona, Colorado, Utah)

North West(Washington, Oregon, Idaho, California, Nevada)

Pacific\North (Hawaii, Alaska)