A cylindrical wave is a sound wave whose wavefront is a coaxial cylinder. It is usually a line source (such as a sound column) or sound is generated by a long slit. The attenuation in propagation is less than the spherical wave, and the distance is doubled. The sound pressure level is attenuated by 3 decibels, so that the speaker emits a cylindrical wave, which is an important means for the sound reinforcement system to increase the sound wave transmission distance.
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