Competitors are classified by the average Sound Pressure Level of their sound system when qualifying.
During qualifying, each contestantís sound system is measured with a Term-LAB SPL meter. This meter measures the average SPL of the contestantís sound system in dB over a period of 30 seconds. At the end of the 30 second measurement period, the contestant will be placed into one of four Bass Race classes based upon the contestantís score.
The classes are:
120.0 dB to 129.9 dB
130.0 dB to 139.9 dB
140.0 dB to 149.9 dB
150.0 dB to 159.9 dB
Each competition vehicle may compete in one, and only one class at each Bass Race event.
Competitors may not enter the same vehicle in more than one class at a Bass Race event.
Competitors may enter multiple vehicles at a Bass Race event provided that no two vehicles are entered into the same class and provided that each vehicle is entered under a unique competitor 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.
Each competitor must operate his or her own system during competition. "Switch-hitting" is not permitted.