Engineers and producers mixing on the system were so enthusiastic about its sound that UREI started producing the monitors as a commercial product, with the first UREI 813 debuting in 1977.

• 工程师和制片人对混合系统，使热衷于它的声音urei开始生产监察作为一个商业产品，与第一urei 813首次亮相于1977年。