A linear array is arranged in a straight line, closely spaced radiating elements, and have the same amplitude and phase, thereby generating a linear sound source. Called linear sound source is distributed on a large number of equally spaced straight lines, but very small compared with other strong point sound source components. If the number of the point sound source approaches infinity, the point source separation approaches zero, and a relationship of formula nd = l, n is the number of the sound source; d is the distance between the sound source; f is linear sound source length. 

Second, the advantages of the linear array 

         1, due to the characteristics of the linear array directivity in the vertical plane of the spindle was narrow beam, can be remotely superposed energy radiation. Another part of the lower curved columns covering nearly linear region, covering from near and far, so that the entire sound field covered evenly. 

         2, linear array PA speakers more in line with improvements in technology, technology, installation requirements.