The source of the problem of increased noise is the vibrations of vehicle parts that occur during movement. Shocks of the suspension and shock absorbers, the bounce of plastic panels, fan noise - they all work in their own frequency range and create a certain sound background in the car. The bottom line: A long ride in a car with high noise levels leads to driver fatigue, which in turn negatively affects road safety. Most often, car sound insulation helps to solve this problem.

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        Structural Noise: Primary noise comes from the engine, exhaust system, transmission, tires, etc. Secondary                            noise comes from metal body panels (floor, fenders, arches, doors, roof, etc.), plastic interior parts (dashboard,                          various linings, etc.), and small metal structures (power windows, rods drive locks, etc.).

        Structural noises penetrate into the vehicle interior through the suspension, transmission, chassis, and exhaust                          systems. Vibrations from these elements are transmitted to the vehicle floor and all body panels, which begin                              to emit structure-borne noise and reflected sound, further increasing the noise level. It is the property of a metal                          that conducts sound well and is the main problem when dealing with external noise. Installing soundproofing                              helps fight noise, regardless of its origin.

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        Airborne Noise: From the word "air" - sound waves that penetrate your car's cabin from the outside air.

        Airborne noise penetrates the car interior through the glazing and existing body leaks (technological openings,                            doorways, etc.). At the same time, the noise level depends on the design features of the noise sources and the                          sound-insulating properties of glass and body panels (the thicker they are, the better they keep sound).

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In the car interior, airborne noise from primary sources is generated, first of all, in the presence of "relatively open" spaces - technological holes, leaking gaps in doorways, gaps in body panels, and car glazing. The thickness of the glass and body panels of the car affects the noise level - the thicker the structural elements, the better the noise reduction.

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High-quality design solutions used in the manufacture of a car (this concerns, first of all, the design of the engine itself, as well as the exhaust system and transmission) are already capable of effectively reducing the noise level.

As a result of structure-borne noise, virtually all body panels vibrate. This is considerable merit of the car's suspension elements, through which vibrations are transmitted, of the chassis, engine, and exhaust system. The latter, by the way, transmits a considerable part of airborne and structural noise through the floor of the car.

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The acoustical properties of the car interior is a separately considered aspect of the formation of unwanted noise and sounds. The reflection of sound waves from parts in the interior of the car is of no small importance here. The quality of the road surface, as well as the quality of the tires themselves (the height of the tread pattern), make their own correction in the overall noise level of the car.

There are three noise-canceling methods, each with its role to play:

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       Sound Deadening: reduces noise by stopping rattles, road noise, and vibrations (structural noise)

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       Sound Blocking: blocks the transmission of unwanted sounds such as road, engine, and exhaust noise (airborne noise)

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       Sound Absorbing: absorbs the energy of sound waves already inside the vehicle's cabin (airborne noise)

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