Acoustic Horn is used in horn-loaded loudspeakers, signaling horns such as those used on cars, trucks, trains, boats and bicycles. It has one moving part, the titanium diaphragm. It produces vibrations at relatively low frequencies in order to remove soot and other buildups of particulates from chimneys, catalyst beds, or other process vessels. It works in the infrasonic or near-infrasonic frequency range that is used mainly with boilers and selective catalytic reduction (SCR) reactors. It includes fundamental frequency, output power level and materials of construction, weight, length, air consumption and shape. It also uses compression drivers, transducers that provide relatively high pressure and low displacement. They are designed to provide smoothness of frequency response, smoothness of power response, tonal balance, low distortion, high efficiency and time alignment.