Cuando dos ondas interfieren constructiva o destructivamente ¿hay alguna ganancia o pérdida de energía? . when two waves interfere with each other, whether it be constructive or destructive interference, is there any gain or loss of energy?

When two waves interfere with each other the energy spectrum changes, in the places where the interference is destructive, the energy almost vanishes, and the places where the interference is constructive the energy increases, so at the end, you don't have a change in the energy (This has sense, the total energy remains constant) but you have a "change in the distribution of energy".