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Work by physically blocking the ear canal, reducing the sound energy that reaches the eardrum. Used in noisy environments to protect hearing (e.g., factories, concerts, shooting ranges).

Absorb sound to reduce reverberation and echo in a room. They are made of porous materials that trap sound waves. Commonly used in recording studios, theaters, and meeting rooms.

Design utilizes a series of chambers and baffles to reduce engine noise. It works by disrupting sound wave patterns and allowing them to cancel each other out. Primarily used in the exhaust systems of vehicles.

Electronics that emit sound waves of the same amplitude but opposite phase to incoming noise, creating destructive interference to cancel it out. Utilized in headsets, headphones, and some cars.

Constructed with multiple layers of glass and special framing to significantly reduce the transmission of sound. They provide sound insulation for buildings alongside busy streets or airports.

Utilize a hollow body that reflects sound waves back at themselves to produce destructive interference, thus reducing certain frequency noise from exhaust pipes. Commonly found in conjunction with mufflers in vehicle exhaust systems.

Installed in ducts or chambers to disrupt sound wave propagation by causing reflections and absorption, which decreases the noise level. Often used in HVAC systems and industrial machinery.

Attach to the muzzle of a firearm to reduce the noise of discharge. They work by slowing and cooling the expanding gases that exit the gun barrel. Used with firearms to lower sound levels and reduce muzzle flash.

These work as sound dampeners by absorbing footfall and other impact noises. Thick materials and underlays are particularly effective. Widely used in homes and office buildings to lower ambient noise levels.