Acoustic boards are dense, fibrous panels used to control cabin noise. Placed against the firewall, under the hood, and inside door shells, they act as barriers to block engine hums and tire vibrations. By absorbing these sound waves, they keep the passenger cabin quiet and comfortable at highway speeds.
These panels are engineered to handle harsh automotive environments. Under-hood boards must resist high engine temperatures and oil splashes. They are usually made of compressed fiberglass or treated synthetic fibers that will not catch fire or mold if they get wet.
During repairs, these boards are often removed to access wiring or mechanical parts. Technicians must handle them carefully to avoid tearing the fiber backing. If a board is left off or damaged, passenger cabin noise will increase, making the car feel unrefined.