All of the auto sound equipment used in the competitor's sound system must satisfy the following guidelines:
3-1
All auto sound equipment must be designed for installation and operation in a 12-Volt auto sound environment.
3-2
All auto sound equipment must be (or have been) commercially available. The determination as to whether a product is (or was) commercially available shall be at the sole discretion of the dBDRA.
Additional Guidelines:
Equipment must be available for purchase through legitimate auto sound retailers. For clarification purposes, the dBDRA defines a legitimate retailer as any business that is legally licensed to conduct auto sound related transactions, operates a retail establishment that is open for business at least 40 hours per week, and is a factory authorized dealer for the equipment in question.
3-3
All auto sound amplifiers must be linear in nature.
Additional Guidelines:
The amplifiers used in the sound system should be designed for audio reproduction. For clarification purposes, the amplifier's output waveform should be a close facsimile to that of the input signal. In addition, the amplifier's output magnitude should be proportional to that of the input signal. The determination as to whether an amplifier is acceptable for use in Bass Race competition shall be at the sole discretion of the dBDRA.
No embedded active power sources (such as batteries) may reside inside of the amplifier.
3-4
The program material must be reproduced using conventional loudspeakers (subwoofers). The determination as to whether a loudspeaker is acceptable for use in Bass Race Racing competition shall be at the sole discretion of the dBDRA.
Additional Guidelines:
The dBDRA defines a conventional loudspeaker as a sound reproducing electro-mechanical transducer that incorporates a cone, surround, basket, and voice-coil.
The loudspeaker must be powered directly by the audio amplifier(s).
Loudspeakers incorporating servo mechanisms, actuators, or any other form of mechanically powered motor are specifically prohibited.
A maximum of 4 electrical conductors may be connected to each woofer as long as no other applicable rules are violated.
A maximum of 2 amplifiers may be connected to each coil on a woofer.
Compressed air, explosive devices, etc. are expressly forbidden.
3-5
Auto sound equipment introduced less than 60 days prior to the Season Cut-Off date will not be permitted at the Finals or at ANY multi-point event. (Products must actually be shipping and commercially available at retailers 60 days prior to the deadline date.)
3-6
Competition vehicles and auto sound systems may NOT be altered during competition at the Finals or at ANY multi-point event. Only damaged equipment may be replaced and the equipment being replaced may only be replaced with an equivalent component. The determination as to whether a product is an equivalent component shall be at the sole discretion of the dBDRA.
Exception:
At the World Finals, components may only be replaced with an identical (exact replacement - same brand and model) component.
Additional Guidelines and Examples:
This rule does not apply to source units or signal processors.
The period of time from which alterations are prohibited begins with the start of the event (registration) and ends with the awards ceremony at the conclusion of the event.
You may replace a broken 400-Watt amplifier with another brand's 400-Watt amplifier. You may not replace a 400-Watt amp with a 1000-Watt amp. (The replacement amp's rated output power must be within +/- 20% of the original amp's rated output power.)
You may adjust the tuning frequency of your enclosure by adjusting the enclosure's vent. You may not rebuild or replace the enclosure.
You may not rebuild or modify your vehicle's interior.
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