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The JBL D 51 S 7 is a loudspeaker model produced by JBL, likely part of a series of audio products from the mid-20th century. It was manufactured in the USA from 1965 to 1976. The D 51 S 7, along with other models like the D 50 S 7 R and D 50 S 8 R, are known for their distinctive sound quality and ...