S-30A 1985
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Since 1985, the S-30, S-30A and S-30B loudspeakers have been manufactured by the Riga Plant named after them since 1985. Popov. The speakers were called as "10АС-221" (S-30) and "10АС-222" (S-30В). And since 1982, the plant according to the previous GOST issued the same speakers with the names "10АС-314" and "10АС-315" (Radiotehnika "S-30").
Documentation:
Information from collection of Valery Khartchenko