Basic rules and regulations of the format for the 2026 season©
The primary goal of the USD format is to attract young athletes to car audio as a technical motorsport in Russia. This format can be considered a starting point for this type of motorsport, as its rules are extremely lenient and allow everyone to test their audio system and skills. The professional judging panel consists of individuals who have been involved in car audio for years and are titled athletes in various federations. The judge's primary goal is to adhere to the format's rules and provide competent, qualified assistance to the athlete, both in explaining the format's rules and in providing informed responses to eliminate, correct, or improve the athlete's system for the future.
This format primarily features everyday systems, divided into classes with their own limitations for each system and for different car body types.
*In any disputes not specified in the rules, the decision is made by the Judging Panel directly in the measurement area!
Official Format Measuring Instruments:
SPL Track – Term Lab
BFSPL Track – SPL Lab Noise Meter
ADVERTISING AND STICKERS - Participants in branded vehicles with stickers and logos of brands that are NOT FORMAT partners are allowed ONLY if these stickers are completely covered or removed. Covering with opaque masking tape, paper, newspapers, garbage bags, or other OPAQUE materials is prohibited.
*Any unauthorized advertising is prohibited on the USD format. The installation of tents, marquees, flags, and other advertising structures is strictly by prior arrangement!
Participation fees – participants' support of the format in the form of fees – are non-refundable in the event of a participant's entry to the site or subsequent technical problems with their vehicle.
This format primarily features everyday systems, divided into classes with their own limitations for each system and for different car body types.
*In any disputes not specified in the rules, the decision is made by the Judging Panel directly in the measurement area!
Official Format Measuring Instruments:
SPL Track – Term Lab
BFSPL Track – SPL Lab Noise Meter
ADVERTISING AND STICKERS - Participants in branded vehicles with stickers and logos of brands that are NOT FORMAT partners are allowed ONLY if these stickers are completely covered or removed. Covering with opaque masking tape, paper, newspapers, garbage bags, or other OPAQUE materials is prohibited.
*Any unauthorized advertising is prohibited on the USD format. The installation of tents, marquees, flags, and other advertising structures is strictly by prior arrangement!
Participation fees – participants' support of the format in the form of fees – are non-refundable in the event of a participant's entry to the site or subsequent technical problems with their vehicle.
SPL (Sound Pressure Level) measurement - in all SPL classes, the measurement takes 1 minute (60 seconds), during which the average value is recorded. Since the measurement takes place on the track, the car's audio system must reproduce the entire frequency range during the measurement, that is, the car must have LF/MF/HF speakers capable of reproducing the entire track band.
It is allowed to use tracks with a superimposed sine wave, but the frequency is limited to 45 Hz, that is, using a higher frequency is prohibited!
Mandatory: during the measurement for the SPL Limited / SPL1x2 / SPL2x2 / SPL Sedan / NoLim classes - one element, a door, a window (two doors are possible) must be fully open, that is, if it is a window, it must be fully lowered throughout the measurement! Elements such as a window, present in some models, are not considered a door or window!
In higher classes, one driver's door must be open!
No more than 6 people are allowed to park a car in any of the areas.
To avoid emergencies such as vehicle overheating, blown cooling pipes, rolling through the measurement area, and so on, and to prevent injury to spectators, participants, and judges, engine speed must not exceed 2200 rpm during the measurement. Violation of this requirement, resulting in injury to anyone, will be the participant's responsibility! The event administration reserves the right to disqualify a participant from the competition, with subsequent annulment of the results!
Important: Upon entering the measurement area, participants must open all vehicle components for judges to access. Only participants and judges are allowed in the measurement area during judging! Third parties are not permitted to interfere with the judging process! Complaints and claims may only be filed by participants in a class ranked no higher than 4th in the standings. Complaints or claims must be submitted to the head judge verbally or in writing. If in doubt, the participant's vehicle undergoes a full inspection to ensure it complies with the class requirements. Also, during the finals, record-breaking cars may be subject to a full inspection at the discretion of the judges.
In the event of inappropriate behavior in the measuring area, arguing with the judges, raising their voice, or unsportsmanlike conduct, the participant will be disqualified from the stage!
It is allowed to use tracks with a superimposed sine wave, but the frequency is limited to 45 Hz, that is, using a higher frequency is prohibited!
Mandatory: during the measurement for the SPL Limited / SPL1x2 / SPL2x2 / SPL Sedan / NoLim classes - one element, a door, a window (two doors are possible) must be fully open, that is, if it is a window, it must be fully lowered throughout the measurement! Elements such as a window, present in some models, are not considered a door or window!
In higher classes, one driver's door must be open!
No more than 6 people are allowed to park a car in any of the areas.
To avoid emergencies such as vehicle overheating, blown cooling pipes, rolling through the measurement area, and so on, and to prevent injury to spectators, participants, and judges, engine speed must not exceed 2200 rpm during the measurement. Violation of this requirement, resulting in injury to anyone, will be the participant's responsibility! The event administration reserves the right to disqualify a participant from the competition, with subsequent annulment of the results!
Important: Upon entering the measurement area, participants must open all vehicle components for judges to access. Only participants and judges are allowed in the measurement area during judging! Third parties are not permitted to interfere with the judging process! Complaints and claims may only be filed by participants in a class ranked no higher than 4th in the standings. Complaints or claims must be submitted to the head judge verbally or in writing. If in doubt, the participant's vehicle undergoes a full inspection to ensure it complies with the class requirements. Also, during the finals, record-breaking cars may be subject to a full inspection at the discretion of the judges.
In the event of inappropriate behavior in the measuring area, arguing with the judges, raising their voice, or unsportsmanlike conduct, the participant will be disqualified from the stage!
Each SPL class has specific restrictions, and some classes also have general restrictions on cabin components and system layout. Below is a detailed description of the classes and their restrictions.
The class has a limited budget of 45,000 rubles. The budget is limited only to the bass component, i.e., a subwoofer and amplifier (monoblock). The recommended retail price on the day of the competition is taken into account. Participants also have a 10% allowance for equipment costs above the class budget. (The budget and allowance limits are subject to change during the season based on fluctuations in the market price of components.)
IMPORTANT! – All bass components must be current and available from authorized dealers and manufacturers. Discontinued models are not eligible for this class
Power supply: Battery in the standard location no more than 75 Ah. Lithium, Titanate, Manganate, etc. batteries are PROHIBITED! AGM batteries are allowed! Voltage no more than 15 volts!
Interior - all interior components, from the trunk to the dashboard, as specified by the manufacturer, must be in their original locations! (*with the exception of small parts, described below).
Hatchbacks are permitted to have no rear parcel shelf. The rear seatbacks must be locked in their normal position.
In cars with a sedan body, the rear shelf must be secured in its regular place, but it is allowed to fold the backrests of the rear seats.
The equipment must not extend beyond the trunk area, while maintaining glazing!
Visible sound and vibration insulation is prohibited in the passenger compartment and trunk!
- The use of struts and body reinforcements is prohibited! - Car windows must be of the standard thickness! Armor elements are prohibited! - Strengthening the car structure is permitted only through noise and vibration insulation! Gluing, welding and other introduction of additional metal into the car structure in order to increase rigidity, as well as reinforcement with resin (except for door panels) are PROHIBITED! - Scotch tape inside and outside the car is PROHIBITED! - Reinforcing the ceiling covering with resin is PROHIBITED! Painting the ceiling covering is not considered reinforcement. - Raising the floor with vibration insulation and other materials is not more than 40 mm!
IMPORTANT! – All bass components must be current and available from authorized dealers and manufacturers. Discontinued models are not eligible for this class
Power supply: Battery in the standard location no more than 75 Ah. Lithium, Titanate, Manganate, etc. batteries are PROHIBITED! AGM batteries are allowed! Voltage no more than 15 volts!
Interior - all interior components, from the trunk to the dashboard, as specified by the manufacturer, must be in their original locations! (*with the exception of small parts, described below).
Hatchbacks are permitted to have no rear parcel shelf. The rear seatbacks must be locked in their normal position.
In cars with a sedan body, the rear shelf must be secured in its regular place, but it is allowed to fold the backrests of the rear seats.
The equipment must not extend beyond the trunk area, while maintaining glazing!
Visible sound and vibration insulation is prohibited in the passenger compartment and trunk!
- The use of struts and body reinforcements is prohibited! - Car windows must be of the standard thickness! Armor elements are prohibited! - Strengthening the car structure is permitted only through noise and vibration insulation! Gluing, welding and other introduction of additional metal into the car structure in order to increase rigidity, as well as reinforcement with resin (except for door panels) are PROHIBITED! - Scotch tape inside and outside the car is PROHIBITED! - Reinforcing the ceiling covering with resin is PROHIBITED! Painting the ceiling covering is not considered reinforcement. - Raising the floor with vibration insulation and other materials is not more than 40 mm!
- Lack of a stove is PROHIBITED!
The main class limitation is an amplifier of no more than 4000 W +100 W (the manufacturer's declared power in 1 Ohm). No area restrictions.
The battery has no restrictions. The voltage limit is no more than 16 volts.
Interior - all interior elements, from the trunk to the dashboard, provided by the manufacturer, must be in their standard locations! (*with the exception of small parts, described below).
In cars with a hatchback body, the absence of a rear shelf is permitted. The position of the rear seat backs is not regulated, BUT, the seat and seatbacks must be in the cabin, and also, freely fixed in the position provided by the manufacturer.
In cars with a sedan body, the rear shelf must be secured in a standard place, but it is allowed to fold the rear seatbacks.
The absence of a heater is PROHIBITED!
Equipment must not protrude from the trunk area along the backs of the rear seats (if the seat is adjustable for reach and tilt, then it must be fixed in the standard fasteners in the extreme position).
The height limit for the trunk lid is no higher than 13 cm from the glass!
The trunk lid may be bare.
The battery has no restrictions. The voltage limit is no more than 16 volts.
Interior - all interior elements, from the trunk to the dashboard, provided by the manufacturer, must be in their standard locations! (*with the exception of small parts, described below).
In cars with a hatchback body, the absence of a rear shelf is permitted. The position of the rear seat backs is not regulated, BUT, the seat and seatbacks must be in the cabin, and also, freely fixed in the position provided by the manufacturer.
In cars with a sedan body, the rear shelf must be secured in a standard place, but it is allowed to fold the rear seatbacks.
The absence of a heater is PROHIBITED!
Equipment must not protrude from the trunk area along the backs of the rear seats (if the seat is adjustable for reach and tilt, then it must be fixed in the standard fasteners in the extreme position).
The height limit for the trunk lid is no higher than 13 cm from the glass!
The trunk lid may be bare.
The main class restriction is an amplifier no more than 8000 W + 100 W (the manufacturer's stated power in 1 Ohm). There are no restrictions on the subwoofer size.
The battery has no restrictions. The voltage limit is no higher than 16 volts.
Interior - all interior elements, from the trunk to the dashboard, provided by the manufacturer, must be in the standard locations! (*with the exception of small parts, described below).
In hatchback cars, the absence of a rear parcel shelf is permitted. The position of the rear seat backrests is not regulated, BUT, the seat and seatbacks must be in the interior, and also freely fixed in the position intended by the manufacturer.
In sedan cars, the rear parcel shelf must be secured in the standard location, but folding the rear seatbacks is permitted.
The absence of a heater is PROHIBITED!
Equipment must not extend beyond the rear seatbacks (if the seat is adjustable for reach and tilt, it must be secured in the standard mounts at the outermost position).
The height of the trunk must be no higher than 18 cm from the glass!
The trunk lid may be left bare.
The battery has no restrictions. The voltage limit is no higher than 16 volts.
Interior - all interior elements, from the trunk to the dashboard, provided by the manufacturer, must be in the standard locations! (*with the exception of small parts, described below).
In hatchback cars, the absence of a rear parcel shelf is permitted. The position of the rear seat backrests is not regulated, BUT, the seat and seatbacks must be in the interior, and also freely fixed in the position intended by the manufacturer.
In sedan cars, the rear parcel shelf must be secured in the standard location, but folding the rear seatbacks is permitted.
The absence of a heater is PROHIBITED!
Equipment must not extend beyond the rear seatbacks (if the seat is adjustable for reach and tilt, it must be secured in the standard mounts at the outermost position).
The height of the trunk must be no higher than 18 cm from the glass!
The trunk lid may be left bare.
There are no restrictions on the subwoofer area.
Power supply - the battery has no restrictions. The voltage limit is no higher than 16 volts.
Interior - all interior elements, from the trunk to the dashboard, provided by the manufacturer, must be in the standard locations! (*with the exception of small parts, described below).
Lack of a heater - PROHIBITED!
In cars with a hatchback body, the absence of a rear shelf is permitted. The position of the rear seat backs is not regulated, BUT, the seat and seatbacks must be in the interior, and also freely fixed in the position intended by the manufacturer.
In cars with a sedan body, the rear shelf must be secured in the standard location, but it is allowed to fold the rear seatbacks.
The absence of a plastic trunk lid is permitted.
Equipment must not extend beyond the rear seatbacks from the trunk area (if the seat is adjustable for reach and tilt, it must be secured in the standard mounts at the outermost position. If the vehicle is equipped with three rows of seats, where the third row is located beyond the rear doors, this row may be omitted).
The height of the box must not exceed 18 cm from the window.
Power supply - the battery has no restrictions. The voltage limit is no higher than 16 volts.
Interior - all interior elements, from the trunk to the dashboard, provided by the manufacturer, must be in the standard locations! (*with the exception of small parts, described below).
Lack of a heater - PROHIBITED!
In cars with a hatchback body, the absence of a rear shelf is permitted. The position of the rear seat backs is not regulated, BUT, the seat and seatbacks must be in the interior, and also freely fixed in the position intended by the manufacturer.
In cars with a sedan body, the rear shelf must be secured in the standard location, but it is allowed to fold the rear seatbacks.
The absence of a plastic trunk lid is permitted.
Equipment must not extend beyond the rear seatbacks from the trunk area (if the seat is adjustable for reach and tilt, it must be secured in the standard mounts at the outermost position. If the vehicle is equipped with three rows of seats, where the third row is located beyond the rear doors, this row may be omitted).
The height of the box must not exceed 18 cm from the window.
This class is designed specifically for sedans. There are no restrictions on space, power, or fuel consumption in this class! The main limitation is that all components specified by the manufacturer outside the trunk must be in their original locations (*except for small parts, described below).
The battery has no limitations. The voltage limit is no higher than 16 volts.
All equipment must be stored in the trunk. Seat back reinforcements are permitted. During the measurement, the seat back may be reclined or removed from its mountings, but not removed from the vehicle interior!
Lack of a stove is PROHIBITED!
Car windows must be of the standard thickness! Armored elements are prohibited!
Strengthening the vehicle's structure is permitted only through sound and vibration insulation. Bonding, welding, or other additions of metal to the vehicle's structure to increase rigidity, as well as resin reinforcement (except for door panels), are PROHIBITED!
Door cards.
Door panels modified to enhance the overall sound level of the system must be constructed using the original door panels; plywood bases are prohibited! The height of the modified panel must not overlap more than 40% of the glazing
Bridging is permitted, but the total power of the 2 amplifiers must not exceed the class limit.
Door panels modified to enhance the overall sound level of the system must be constructed using the original door panels; plywood bases are prohibited! The height of the modified panel must not overlap more than 40% of the glazing!
The battery has no limitations. The voltage limit is no higher than 16 volts.
All equipment must be stored in the trunk. Seat back reinforcements are permitted. During the measurement, the seat back may be reclined or removed from its mountings, but not removed from the vehicle interior!
Lack of a stove is PROHIBITED!
Car windows must be of the standard thickness! Armored elements are prohibited!
Strengthening the vehicle's structure is permitted only through sound and vibration insulation. Bonding, welding, or other additions of metal to the vehicle's structure to increase rigidity, as well as resin reinforcement (except for door panels), are PROHIBITED!
Door cards.
Door panels modified to enhance the overall sound level of the system must be constructed using the original door panels; plywood bases are prohibited! The height of the modified panel must not overlap more than 40% of the glazing
- Visible noise and vibration insulation in the cabin is prohibited!
Bridging is permitted, but the total power of the 2 amplifiers must not exceed the class limit.
- The voltage should not exceed 16 volts.
- Body struts and reinforcements are prohibited!
- Car windows must be of the standard thickness! Armored elements are prohibited!
- Front amplifiers can be located under seats and false panels.
- Strengthening the vehicle's structure is permitted only through sound and vibration insulation. Bonding, welding, or other additions of metal to the vehicle's structure to increase rigidity, as well as resin reinforcement (except for door panels), are PROHIBITED!
- Visible noise and vibration insulation in the cabin is prohibited!
- In cars with a sedan body, the trunk opening behind the back of the seats must correspond to the stock state, that is, increasing the opening is PROHIBITED!
- It is permitted to remove the rear seat belts.
- Tape is PROHIBITED inside the car! It may be used on the outside of the car, BUT, if the judge requires a demonstration of the functionality of the taped parts, the competitor must remove the tape in the measuring area.
- Reinforcing ceiling coverings with resin is PROHIBITED! Painting the ceiling covering is not considered reinforcement.
- Raising the floor by means of vibration isolation no more than 40 mm!
- Folding the rear seat backs is permitted in all body types!
Door panels modified to enhance the overall sound level of the system must be constructed using the original door panels; plywood bases are prohibited! The height of the modified panel must not overlap more than 40% of the glazing!
This class is for systems extending beyond the trunk to the B-pillar of the vehicle. There are no restrictions on the area of the subwoofers. The enclosure height is limited to 32 cm from the top of the box to the ceiling (the top point is considered to be the part of the box itself, including the box structure, tie rods, etc.).
Subwoofers may be installed with their motors facing outward!
The enclosure must not extend beyond the B-pillar and must pass the wall test!
Power - no restrictions! Voltage - no more than 16 volts.
Interior - all interior elements, from the B-pillar to the dashboard, as provided by the manufacturer, must be in their standard locations! (*with the exception of small parts, described below). The ceiling and plastic trim above the glass must be in place.
The absence of a heater is PROHIBITED!
The rear windows must open in the standard mode; gluing glass is PROHIBITED.
The strut bar is permitted. It must have a bolted connection. The strut pad may be welded to the body, but its base may not exceed 10x10 cm in size, and its pipe area may not exceed 3 inches. The lower strut mount must not extend beyond the B-pillar. This means that the lower strut mount must not interfere with the wall test.
Reinforcing the vehicle structure is permitted only through sound and vibration insulation! Bonding, welding, or other additions of metal to the vehicle structure to increase rigidity are PROHIBITED! The use of resin is permitted only in the trim or its integral parts. Fastening any doors or vehicle components during the measurement is prohibited!
Increasing the spare tire space to accommodate an additional battery is permitted.
Vehicle body fastening elements intended by the manufacturer for bolted fastening (hinges, locks, etc.) may not be welded.
Door panels.
Door panels that have been modified to enhance the overall sound level of the system must be constructed using the original door panels; plywood bases are prohibited! The height of the modified panel must not exceed the glazing edge by more than 40%!
Subwoofers may be installed with their motors facing outward!
The enclosure must not extend beyond the B-pillar and must pass the wall test!
Power - no restrictions! Voltage - no more than 16 volts.
Interior - all interior elements, from the B-pillar to the dashboard, as provided by the manufacturer, must be in their standard locations! (*with the exception of small parts, described below). The ceiling and plastic trim above the glass must be in place.
The absence of a heater is PROHIBITED!
The rear windows must open in the standard mode; gluing glass is PROHIBITED.
The strut bar is permitted. It must have a bolted connection. The strut pad may be welded to the body, but its base may not exceed 10x10 cm in size, and its pipe area may not exceed 3 inches. The lower strut mount must not extend beyond the B-pillar. This means that the lower strut mount must not interfere with the wall test.
Reinforcing the vehicle structure is permitted only through sound and vibration insulation! Bonding, welding, or other additions of metal to the vehicle structure to increase rigidity are PROHIBITED! The use of resin is permitted only in the trim or its integral parts. Fastening any doors or vehicle components during the measurement is prohibited!
Increasing the spare tire space to accommodate an additional battery is permitted.
Vehicle body fastening elements intended by the manufacturer for bolted fastening (hinges, locks, etc.) may not be welded.
Door panels.
Door panels that have been modified to enhance the overall sound level of the system must be constructed using the original door panels; plywood bases are prohibited! The height of the modified panel must not exceed the glazing edge by more than 40%!
The trim must not extend beyond the B-pillar and must pass the wall test!
Power supply - unlimited! Voltage - no more than 16 volts.
Interior - all interior components, from the B-pillar to the dashboard, as provided by the manufacturer, must be in their standard locations! (*with the exception of small parts, described below). Armored elements are PROHIBITED!!! Replacing the windshield with a reinforced one (like classic triplex) is permitted, but not more than 6.2 mm.
Lack of a heater is PROHIBITED!
Seats must be stock, and therefore have headrests, if provided by the manufacturer. The headrests may be removed for the duration of the measurement, but remain inside the car.
It is permitted to remove the seats for the duration of the measurement.
Struts are permitted. The strut structure must have a bolted connection. The strut pad may be welded to the body, but its base cannot exceed 10x10 cm in size, and its pipe area must not exceed 3 inches. The lower strut mount must not extend beyond the B-pillar; that is, the location of the lower strut mount must not interfere with the wall test. Structural reinforcement is permitted only through sound and vibration insulation. Bonding, welding, or other insertion of additional metal into the vehicle structure to increase rigidity, as well as resin reinforcement (except for door panels), is PROHIBITED!
Increasing the spare tire space to accommodate an additional battery is permitted. For the SPL Wall class, the absence of seat belts is permitted if the design covers the standard mounts.
Important: visible sound and vibration insulation in the front of the vehicle is prohibited.
Door panels.
Door panels that have been modified to enhance the overall sound level of the system must be constructed using the original door panels; plywood bases are prohibited! The height of the modified panel must not exceed the glazing edge by more than 40%!
Power supply - unlimited! Voltage - no more than 16 volts.
Interior - all interior components, from the B-pillar to the dashboard, as provided by the manufacturer, must be in their standard locations! (*with the exception of small parts, described below). Armored elements are PROHIBITED!!! Replacing the windshield with a reinforced one (like classic triplex) is permitted, but not more than 6.2 mm.
Lack of a heater is PROHIBITED!
Seats must be stock, and therefore have headrests, if provided by the manufacturer. The headrests may be removed for the duration of the measurement, but remain inside the car.
It is permitted to remove the seats for the duration of the measurement.
Struts are permitted. The strut structure must have a bolted connection. The strut pad may be welded to the body, but its base cannot exceed 10x10 cm in size, and its pipe area must not exceed 3 inches. The lower strut mount must not extend beyond the B-pillar; that is, the location of the lower strut mount must not interfere with the wall test. Structural reinforcement is permitted only through sound and vibration insulation. Bonding, welding, or other insertion of additional metal into the vehicle structure to increase rigidity, as well as resin reinforcement (except for door panels), is PROHIBITED!
Increasing the spare tire space to accommodate an additional battery is permitted. For the SPL Wall class, the absence of seat belts is permitted if the design covers the standard mounts.
Important: visible sound and vibration insulation in the front of the vehicle is prohibited.
Door panels.
Door panels that have been modified to enhance the overall sound level of the system must be constructed using the original door panels; plywood bases are prohibited! The height of the modified panel must not exceed the glazing edge by more than 40%!
Semi-armored wall class!
Decoration must not extend beyond the B-pillar and must pass the wall test!
Power supply - unlimited! Voltage - no more than 16 volts.
Interior - absence of a standard dashboard - Prohibited! Armored elements are allowed (ceiling, armored door, floors)!!! Welding a cage to the engine compartment is PROHIBITED! Replacing the windshield with a reinforced one is allowed, but no more than 15 mm. The armored door glass must not exceed two thicknesses of the stock glass; gluing glass is allowed from the inside. Reducing the area of the side window frame is PROHIBITED.
Absence of a heater is PROHIBITED!
Fixing car elements with bolts is PROHIBITED.
The front seats can be customized, anatomically close to the factory ones. It is also allowed to remove the seats during measurements.
Spacers are permitted. The spacer must be bolted. The spacer pad may be welded to the body, but its base may not exceed 10x10 cm in size, and its pipe area may not exceed 3 inches. Furthermore, the lower spacer mount must not extend beyond the B-pillar. This means that the lower spacer mount must not interfere with the wall test.
Increasing the spare tire space for an additional battery is permitted.
For the SPL Wall+ class, the absence of seat belts is permitted if the design covers the standard mounts.
IMPORTANT: For vehicles such as the VAZ 2101 and similar vehicles with soft door panels, plywood (or similar materials) with a thickness of no more than 5 mm are permitted when creating acoustic panels.
Decoration must not extend beyond the B-pillar and must pass the wall test!
Power supply - unlimited! Voltage - no more than 16 volts.
Interior - absence of a standard dashboard - Prohibited! Armored elements are allowed (ceiling, armored door, floors)!!! Welding a cage to the engine compartment is PROHIBITED! Replacing the windshield with a reinforced one is allowed, but no more than 15 mm. The armored door glass must not exceed two thicknesses of the stock glass; gluing glass is allowed from the inside. Reducing the area of the side window frame is PROHIBITED.
Absence of a heater is PROHIBITED!
Fixing car elements with bolts is PROHIBITED.
The front seats can be customized, anatomically close to the factory ones. It is also allowed to remove the seats during measurements.
Spacers are permitted. The spacer must be bolted. The spacer pad may be welded to the body, but its base may not exceed 10x10 cm in size, and its pipe area may not exceed 3 inches. Furthermore, the lower spacer mount must not extend beyond the B-pillar. This means that the lower spacer mount must not interfere with the wall test.
Increasing the spare tire space for an additional battery is permitted.
For the SPL Wall+ class, the absence of seat belts is permitted if the design covers the standard mounts.
IMPORTANT: For vehicles such as the VAZ 2101 and similar vehicles with soft door panels, plywood (or similar materials) with a thickness of no more than 5 mm are permitted when creating acoustic panels.
A class without restrictions!
This class includes all cars that don't meet the class rules!
This class includes all cars that don't meet the class rules!
*Small parts - parts no larger than 3x3 cm, such as bolt covers, caps, buttons, heater knobs, etc.
*Also, a rearview mirror may be missing.
! IMPORTANT! - Re-measurement is only possible in the event of a technical malfunction during the first second of measurement, before the sensor has recorded the result! Applies to all classes!!! You have 5 minutes to fix the problem without leaving the measurement area!
*Wall test - a stretched element (thread, rope) across the B-pillars in the doorway should pass freely and without obstruction from the top to the bottom of the opening. If the strut extends beyond the B-pillar, the wall test will not be passed!
*Also, a rearview mirror may be missing.
! IMPORTANT! - Re-measurement is only possible in the event of a technical malfunction during the first second of measurement, before the sensor has recorded the result! Applies to all classes!!! You have 5 minutes to fix the problem without leaving the measurement area!
*Wall test - a stretched element (thread, rope) across the B-pillars in the doorway should pass freely and without obstruction from the top to the bottom of the opening. If the strut extends beyond the B-pillar, the wall test will not be passed!
129.9 dB 139.9 dB 149.9 dB 159.9 dB
Rules for participating in the Bass Race classes:
Measurements are taken over a 30-second period on a music track. During this time, the sensor records the average result. Your goal is to get as close to the upper limit as possible in your class.
First comes the qualification round, where your participation class is determined. During the qualification round, you can exceed the upper limit, or you can roll back to the desired class result.
After the qualification round, a class bracket is formed, consisting of 8 athletes (4 pairs). Then, the elimination rounds begin using the Olympic system.
Tie-Breaker: If both participants in the rounds have the same result at the end of the measurement, an automatic re-measurement occurs after 30 seconds. First tiebreaker: participants must turn off their cars, stay in the car, and operate their audio system with the car turned off! During the second Tie-Breaker, participants must exit their cars and control the audio system using a remote control or a portable device. The third Tie-Breaker is a TermLab measuring device that automatically sets the upper limit for the round. For example, the display may show 138.2 dB, even though you're in the 139.9 class. Measurements can continue until a round winner is determined.
During the measurement, regardless of qualification or rounds, the words Ready - Set - Go appear on the screen. If the sensor detects bass before GO, it will be considered a FALSE START, and you will be automatically disqualified!
Measurements are only performed with the DRIVER'S DOOR OPEN!!!
IMPORTANT: sine waves superimposed on the track are prohibited! The track must contain at least three frequencies in the 1 Hz range (e.g., 30 - 32 - 34, with a duration of no more than 3 seconds). If the frequency is one or lasts more than 3 seconds - disqualification!
Rules for participating in the Bass Race classes:
Measurements are taken over a 30-second period on a music track. During this time, the sensor records the average result. Your goal is to get as close to the upper limit as possible in your class.
First comes the qualification round, where your participation class is determined. During the qualification round, you can exceed the upper limit, or you can roll back to the desired class result.
After the qualification round, a class bracket is formed, consisting of 8 athletes (4 pairs). Then, the elimination rounds begin using the Olympic system.
Tie-Breaker: If both participants in the rounds have the same result at the end of the measurement, an automatic re-measurement occurs after 30 seconds. First tiebreaker: participants must turn off their cars, stay in the car, and operate their audio system with the car turned off! During the second Tie-Breaker, participants must exit their cars and control the audio system using a remote control or a portable device. The third Tie-Breaker is a TermLab measuring device that automatically sets the upper limit for the round. For example, the display may show 138.2 dB, even though you're in the 139.9 class. Measurements can continue until a round winner is determined.
During the measurement, regardless of qualification or rounds, the words Ready - Set - Go appear on the screen. If the sensor detects bass before GO, it will be considered a FALSE START, and you will be automatically disqualified!
Measurements are only performed with the DRIVER'S DOOR OPEN!!!
IMPORTANT: sine waves superimposed on the track are prohibited! The track must contain at least three frequencies in the 1 Hz range (e.g., 30 - 32 - 34, with a duration of no more than 3 seconds). If the frequency is one or lasts more than 3 seconds - disqualification!
Participants are prohibited from changing the system configuration to move up a class (such as adding HF, changing the location of the rear speakers). One car can participate in one front and one rear class!
In the Gate 1-6 class, non-standard trim panels are PROHIBITED. The door panel base must have a standard mount, and the panel itself must be built on the original base!
Standard door stops must be present, even if they are not working. External stops (such as a body-to-door or door-to-ground strut) can be used.
IMPORTANT: During front measurements, it is PROHIBITED to turn on subwoofers, as well as stage subwoofers or other means of transmitting sound below 100 Hz!
IMPORTANT: During measurements, ONLY THE PARTICIPANT is in the measurement area! They can be located either inside the car or to the side of the door being measured, no closer than 50 cm.
Moving in front of the sensor during the measurement will result in DISQUALIFICATION!
Door movement during measurements, in any direction, will result in disqualification!
In each BFSPL class, transferring hardware from one car to another is PROHIBITED! The car must enter the testing area in its complete measuring kit! Transporting individual rear systems in another car will result in disqualification!
In the first classes - Gate 1-6, Wicket 6-10, BDW - the use of custom speakers is prohibited. Specifically, speakers in which baskets and motors from different series are crossed. The basket and motor must be stock. Also, replacing the cone and suspension is prohibited, for example: the cone and suspension from an 8" speaker installed on a 6.5-7" basket.
Rewinding, replacing the cover, or any repair to the speaker is not considered customization.
The participant must provide the speaker for inspection at the judge's request. In case of refusal - disqualification from the stage.
IMPORTANT - Measurements of the front and rear speakers at the Final are carried out only from the format carrier! If your system doesn't support USB storage, the format will provide you with a phone number for measurement! All participants share the same phone number, as does the flash drive.
In the Gate 1-6 class, non-standard trim panels are PROHIBITED. The door panel base must have a standard mount, and the panel itself must be built on the original base!
Standard door stops must be present, even if they are not working. External stops (such as a body-to-door or door-to-ground strut) can be used.
IMPORTANT: During front measurements, it is PROHIBITED to turn on subwoofers, as well as stage subwoofers or other means of transmitting sound below 100 Hz!
IMPORTANT: During measurements, ONLY THE PARTICIPANT is in the measurement area! They can be located either inside the car or to the side of the door being measured, no closer than 50 cm.
Moving in front of the sensor during the measurement will result in DISQUALIFICATION!
Door movement during measurements, in any direction, will result in disqualification!
In each BFSPL class, transferring hardware from one car to another is PROHIBITED! The car must enter the testing area in its complete measuring kit! Transporting individual rear systems in another car will result in disqualification!
In the first classes - Gate 1-6, Wicket 6-10, BDW - the use of custom speakers is prohibited. Specifically, speakers in which baskets and motors from different series are crossed. The basket and motor must be stock. Also, replacing the cone and suspension is prohibited, for example: the cone and suspension from an 8" speaker installed on a 6.5-7" basket.
Rewinding, replacing the cover, or any repair to the speaker is not considered customization.
The participant must provide the speaker for inspection at the judge's request. In case of refusal - disqualification from the stage.
IMPORTANT - Measurements of the front and rear speakers at the Final are carried out only from the format carrier! If your system doesn't support USB storage, the format will provide you with a phone number for measurement! All participants share the same phone number, as does the flash drive.
Beachfront SPL (Beach SPL) - this category is designed to identify the loudest cars in the front and rear, the category has 5 classes with different distinctions from the more casual to true volume maniacs.
The measurement lasts 30 seconds, during which time the participant must achieve their best performance. During this time, the sensor captures the entire frequency spectrum from 100 to 18,000 Hz and from 60 to 16,000 Hz for BDW classes. The measurement takes place on a randomly selected track at the venue on the day of the competition. The format publishes the tracks where the measurements will be taken before the start of the season.
For classes Gate 1-6, Wicket 6-10 and Wicket 10+ - the sensor can be located at a height of 60 to 100 cm from the ground (at the participant's choice, in 1 cm increments) and 1 meter from the measured door, as well as 40 cm from the car, the direction of the microphone is in the center of the measured door.
The participant must inform the judge at what height they want the sensor to be set, for example, 1 meter 22 cm. If the participant does not indicate the desired height, the sensor is set at the 1 meter mark.
Measurements are based on standard 6.5-inch speakers. So, if the speaker size is 8x6.5, then it's 5x8 inches. Each driver counts as one 6.5-inch speaker. The tweeter area is not included.
For example, if 6 6.5-inch speakers equal 1283.88 sq. cm, then 4 8-inch speakers fall into this class, since their total area is 1296.52 sq. cm.
The measurement is based on the useful area of the speaker!
IMPORTANT: The sensor is positioned 40 cm from the side of the vehicle in front of the door being measured, with the 1-meter measurement taken from the outermost point of the trim. For BDW classes, the distance to the sensor is also measured from the outermost point of the vehicle or trim, depending on the class.
The measurement lasts 30 seconds, during which time the participant must achieve their best performance. During this time, the sensor captures the entire frequency spectrum from 100 to 18,000 Hz and from 60 to 16,000 Hz for BDW classes. The measurement takes place on a randomly selected track at the venue on the day of the competition. The format publishes the tracks where the measurements will be taken before the start of the season.
For classes Gate 1-6, Wicket 6-10 and Wicket 10+ - the sensor can be located at a height of 60 to 100 cm from the ground (at the participant's choice, in 1 cm increments) and 1 meter from the measured door, as well as 40 cm from the car, the direction of the microphone is in the center of the measured door.
- The participant must inform the judge at what height they want the sensor to be set, for example, 74 cm. If the participant does not indicate the desired height, the sensor is set at the last mark placed.
The participant must inform the judge at what height they want the sensor to be set, for example, 1 meter 22 cm. If the participant does not indicate the desired height, the sensor is set at the 1 meter mark.
Measurements are based on standard 6.5-inch speakers. So, if the speaker size is 8x6.5, then it's 5x8 inches. Each driver counts as one 6.5-inch speaker. The tweeter area is not included.
For example, if 6 6.5-inch speakers equal 1283.88 sq. cm, then 4 8-inch speakers fall into this class, since their total area is 1296.52 sq. cm.
The measurement is based on the useful area of the speaker!
IMPORTANT: The sensor is positioned 40 cm from the side of the vehicle in front of the door being measured, with the 1-meter measurement taken from the outermost point of the trim. For BDW classes, the distance to the sensor is also measured from the outermost point of the vehicle or trim, depending on the class.
This class includes doors with up to six 6.5-inch speakers or larger speakers of equal area (example above). The maximum speaker area in this class is 1300 sq. cm. There is a limit of four tweeters per door. Each driver counts as one 6.5-inch speaker.
The trim must match the window frame.
The front seats must be in their stock runners and suitable for normal vehicle operation. The doors must close with the seat in one of the stock positions.
Building custom boxes on the original base is prohibited. This means using solid plywood as a cover for the door panel is unacceptable. The width of the finished panel must not exceed 25 cm.
The trim must match the window frame.
The front seats must be in their stock runners and suitable for normal vehicle operation. The doors must close with the seat in one of the stock positions.
Building custom boxes on the original base is prohibited. This means using solid plywood as a cover for the door panel is unacceptable. The width of the finished panel must not exceed 25 cm.
This class is for those with 6 to 10 6.5-inch door speakers or larger speakers of equal area. The trim must not infringe on the glass by more than 13 cm. The maximum area for this class is 2150 sq. cm. There is a limit of 8 tweeters per door. Each driver counts as one 6.5-inch speaker.
The front seats must be in their stock runners and suitable for normal vehicle operation. The doors must close with the seat in one of the stock positions.
Building custom boxes on the original base is prohibited. This means that using solid plywood as a cover for the sound card is unacceptable. The width of the finished sound card must not exceed 25 cm.
The front seats must be in their stock runners and suitable for normal vehicle operation. The doors must close with the seat in one of the stock positions.
Building custom boxes on the original base is prohibited. This means that using solid plywood as a cover for the sound card is unacceptable. The width of the finished sound card must not exceed 25 cm.
A class for true battlefield maniacs! No restrictions on area or glazing!
No extension beyond the door. The door must not impede normal vehicle operation (it must open and close). The passenger seat is optional.
IMPORTANT! – Installing subwoofers in door panels is PROHIBITED!
No extension beyond the door. The door must not impede normal vehicle operation (it must open and close). The passenger seat is optional.
IMPORTANT! – Installing subwoofers in door panels is PROHIBITED!
The rear-mounted class is for those with rear-mounted speakers in the trunk capable of loudly and clearly reproducing the entire frequency range from 60 to 18,000 Hz. This class has no size restrictions. The design can be either prefabricated or monolithic, but it must not interfere with the normal operation of the vehicle or its components. This means that if your design is collapsible, when assembled, it must not interfere with the closing of the trunk lid or extend beyond the vehicle's perimeter.
The main RESTRICTION is that vehicles such as minivans, microvans, minibuses, and SUVs are automatically classified as EX.
The main RESTRICTION is that vehicles such as minivans, microvans, minibuses, and SUVs are automatically classified as EX.
The rear class, which includes competitors with rear speaker systems capable of loudly and clearly reproducing the entire frequency range from 60 to 18,000 Hz, is included. This class has no space restrictions. The design can be either prefabricated or monolithic. The system can be located anywhere in the rear of the vehicle, or have external structures that impede normal operation. Fold-down designs are permitted!
*This category is held at the discretion of the format organizers at individual stages and may not be held at all during the season!
One of the most popular types of front measurement, aimed at identifying not only the loudest, but also the most stable system.
Three classes: Deadly Door, Deadly Gate, Deadly Wicket. All three classes will be available at each stage of the competition. At regular stages, 1 measurement will be taken for 1 minute (60 seconds), based on the average value!
During this time, the sensor captures the entire frequency spectrum from 100 to 20,000 Hz.
The sensor is located at a height of 80 cm from the ground, the microphone is directed towards the center of the door being measured.
*At the opening and finals, measurements will be taken using a knockout round system.
Beachfront SPL
measurements Class restrictions:
Deadly Door
This class is for doors with up to 6 doors installed. 6.5-inch speakers or larger speakers of equal area (example above). The maximum speaker area in this class is 1,300 sq. cm.
The casing must match the glazing edge!
Deadly Gate
This class is for those with 6 to 10 6.5-inch speakers in the door or larger speakers of equal area. The casing must not exceed the glazing edge by more than 11 cm. The maximum area in this class is 2,150 sq. cm.
Deadly Wicket
No area or glazing restrictions!
*USD format administration reserves the right to change, replace, or expand Beachfront SPL classes during the season!
One of the most popular types of front measurement, aimed at identifying not only the loudest, but also the most stable system.
Three classes: Deadly Door, Deadly Gate, Deadly Wicket. All three classes will be available at each stage of the competition. At regular stages, 1 measurement will be taken for 1 minute (60 seconds), based on the average value!
During this time, the sensor captures the entire frequency spectrum from 100 to 20,000 Hz.
The sensor is located at a height of 80 cm from the ground, the microphone is directed towards the center of the door being measured.
*At the opening and finals, measurements will be taken using a knockout round system.
Beachfront SPL
measurements Class restrictions:
Deadly Door
This class is for doors with up to 6 doors installed. 6.5-inch speakers or larger speakers of equal area (example above). The maximum speaker area in this class is 1,300 sq. cm.
The casing must match the glazing edge!
Deadly Gate
This class is for those with 6 to 10 6.5-inch speakers in the door or larger speakers of equal area. The casing must not exceed the glazing edge by more than 11 cm. The maximum area in this class is 2,150 sq. cm.
Deadly Wicket
No area or glazing restrictions!
*USD format administration reserves the right to change, replace, or expand Beachfront SPL classes during the season!
Every USD participant must understand and recognize that using a loud and powerful audio system can be dangerous, not only for the participant but also for those around them. Every USD participant must demonstrate appropriate behavior on the field, as must their companions! The USD administration is against immoral and inappropriate behavior! Every SPL participant must show others that car audio is not just a hobby, but a fully-fledged form of technical motorsport in which adults, serious and balanced people compete, thereby proving that this sport is worth pursuing and enjoying!
And of course, honor the SPL code:
- I will never use my system in a way that causes inconvenience to others.
- I will never use my system in a way that could lead to injury.
- I will do everything possible to ensure that SPL competitions are viewed positively as a sport.
- When participating in competitions, I will conduct myself professionally.
- I will do everything possible to support those companies and retailers that support our sport.
- I will always follow the rules at USD competitions and will do everything possible to ensure that others do the same.
*For violation of the format rules, the judge or format administration has the right to disqualify a participant, for a period ranging from one stage to the entire competition season!
*These rules, as well as the format name, logo, and other integral elements of the format's creation, are intellectual property and are protected by the current legislation of the Russian Federation! ©
Founder of the Ultimate Sound Destruction format - USD Dinov. D.
And of course, honor the SPL code:
- I will never use my system in a way that causes inconvenience to others.
- I will never use my system in a way that could lead to injury.
- I will do everything possible to ensure that SPL competitions are viewed positively as a sport.
- When participating in competitions, I will conduct myself professionally.
- I will do everything possible to support those companies and retailers that support our sport.
- I will always follow the rules at USD competitions and will do everything possible to ensure that others do the same.
*For violation of the format rules, the judge or format administration has the right to disqualify a participant, for a period ranging from one stage to the entire competition season!
*These rules, as well as the format name, logo, and other integral elements of the format's creation, are intellectual property and are protected by the current legislation of the Russian Federation! ©
Founder of the Ultimate Sound Destruction format - USD Dinov. D.
