The work is devoted to acoustic emission (AE) which occurs in the process of crystallization of metals and non-organic substances. The objective of the research is to obtain an AE signal from the interphase surface and carry out frequency analysis of the spectrum. The results of the research have shown that the signals generated have maximum amplitude in 21-27 kHz range with maximums at 21 and 24 kHz at v=0,8 cm/sec and at 21 and 23 kHz at v=1,43 cm/sec. To explain the results obtained the cluster model of melts was applied. Every AE signal corresponds to the advance of interphase surface by a step equal to 3 layers of clusters. © 2008 IOP Publishing Ltd.