baffle

A baffle is a device designed to check, deflect, or regulate the flow of fluids, light, or sound. In acoustics, baffles are crucial for managing sound waves. They are often used in loudspeakers, typically mounted in boxes, to prevent sound waves from the back of the speaker from interfering with those from the front. This is important because sound waves from opposite sides of a speaker can be out of phase, leading to destructive interference, especially at low frequencies, which significantly reduces sound intensity. By separating the sound waves, baffles ensure that they are in phase when they reach the listener, thereby increasing the perceived loudness and clarity of the sound. This principle is also applied in technologies like automobile mufflers to cancel out unwanted noise through destructive interference.12