Make Every Electric Vehicle Heard: Five Engineering Essentials of High-Performance AVAS Speakers

1.Introduction
2.Five Core Engineering Requirements for AVAS Speakers
3.BESTAR Automotive Acoustic Engineering Capabilities
4.Conclusion

Introduction
Electric and hybrid vehicles run almost silently at low speed. This stillness presents a real danger to the pedestrian, particularly impaired individuals who use engine noise to identify traffic nearby. Governments around the world responded with strict regulations, like UNECE R138, US FMVSS 141, and China GB/T 37153 that require EVs and HEVs need to install an AVAS at low speed.
The AVAS speaker is the heart of this safety system. Requires to sound a clear, audible warning tone to alert people outside the vehicle. But it is not an easy way to achieve that. Typically the AVAS speaker is installed in the front of the grille, under the car's chassis or near the wheel well. It is exposed to water, dust, vibrations and large temperature changes on a daily basis from these locations. A speaker built for indoor comfort systems simply cannot survive here.
Beyond the regulatory driver, automakers also see the AVAS speaker as part of the overall vehicle sound identity. A well designed warning tone can reinforce brand character while still meeting every legal requirement. This adds another layer of complexity for sourcing and engineering teams, since the AVAS speaker must satisfy regulators, protect pedestrians, and support the brand experience at the same time.
This is where BESTAR brings real value. With years of experience in automotive acoustics and vehicle grade speaker design, BESTAR helps engineering teams solve the toughest AVAS speaker challenges. This covers everything from raw acoustic output to long term durability in harsh outdoor conditions.

Five Core Engineering Requirements for AVAS Speakers
1. Structural Design and Packaging
Space in the front cabin and grille area is tight. Every AVAS speaker must fit into a compact footprint without adding unnecessary weight to the vehicle. At the same time, it must adapt to different chassis layouts and mounting methods used across various vehicle platforms. A well designed AVAS speaker uses a compact housing structure and flexible bolt mounting options. Engineers can then integrate it into many vehicle models without redesigning the whole assembly.
The type of material used is also a factor in packaging. Housings are usually made from a reinforced engineering plastics material or metal coated to achieve a combination of strength, light weight and cost. In addition, an optimal structural design safeguards the internal driver unit during stone impact and on road debris without hindering the sound projection towards the exterior.
2. Acoustic Performance and Frequency Response
Regulations set specific requirements for sound pressure level and frequency range. The AVAS speaker must produce a clear, recognizable tone within these bands. This lets pedestrians immediately understand a vehicle is approaching. Sound direction also matters. A properly tuned AVAS speaker projects sound outward toward pedestrians and street level, not back into the cabin. This protects driver and passenger comfort, often described as NVH performance. Low total harmonic distortion keeps the warning tone clean and easy to recognize, even at higher volume.
BESTAR AVAS speakers are made around exactly these requirements. These models are developed based on the desired target, frequency response curve and directionality pattern. This makes it easier to complete regulatory testing without having to rework the completed vehicle. It has been designed to provide structural strength, waterproof and temperature tolerance at once. Engineering teams receive everything they desire in terms of what components are acoustically, mechanically and environmentally capable.
3. Ingress Protection: Waterproofing and Dust Resistance
An AVAS speaker mounted outside the cabin faces rain, road spray and high pressure car wash jets on a regular basis. Along with the above, there are other additional stresses due to dust, sand and road salt all adding up to the longevity of a vehicle. Most AVAS speakers must shield against the environment with a high ingress protection rating, typically IP67 or IP6K9K. This type of protection prevents water and particles entering the internal components. The speaker continues to be damaged over the many years of daily exposure. Enables a speaker to keep on being harmed throughout the many years of exposure each day.
4. Vibration and Mechanical Shock Resistance
Vehicles vibrate constantly. Rough roads, engine bay vibration, and stray gravel impacts all place mechanical stress on an AVAS speaker. The component must meet vehicle grade vibration and shock standards, such as ISO 16750. This proves it can survive years of real world driving without losing acoustic performance or mechanical integrity.
5. Operating Temperature Range and Weatherability
An AVAS speaker has to work at a temperature as low as 40°C during the winter season. It also has to endure extremely hot environments like in the engine bay which can sometimes attain the extremes of 85°C or even 105°C. Standards require materials to be able to age, crack and drift in performance over this entire range. A speaker that performs well in a lab but fails after one hot summer or one cold winter is not a viable automotive component.

BESTAR Automotive Acoustic Engineering Capabilities
Engineering teams at BESTAR use advanced acoustic simulation tools, including finite element analysis and boundary element analysis. A dedicated anechoic chamber supports real world acoustic testing. This combination lets BESTAR validate sound pressure level, frequency response, and directional performance before a single physical sample is built. This saves development time for customers.
BESTAR also supports full custom and OEM or ODM development. This includes warning tone design, mechanical housing development, and acoustic tuning, delivered as a single coordinated service. Customers do not need to manage multiple vendors for different parts of the AVAS speaker development process.

Conclusion
An AVAS speaker is not an ordinary warning horn. It is a safety critical component that must combine precise acoustic performance, vehicle grade durability, and careful mechanical design. Choosing a supplier with real automotive acoustic expertise makes a direct difference in program success.
As global EV adoption continues to rise, regulatory scrutiny on pedestrian safety will only increase. Suppliers that understand both acoustic engineering and materials science and the automotive quality system as one are most likely to be able to support this transition.
BESTAR combines these disciplines under one roof, giving customers a single point of contact for AVAS speaker development from concept to mass production.
Engineering and procurement teams working on next generation electric vehicle AVAS systems are welcome to contact the BESTAR acoustic engineering team. Product specification sheets, sample testing, and custom design support are all available to help move your program forward.