By the mid-1980s, Merzbow had established itself as a defining voice in the emerging global noise underground. International cassette-trading networks carried Akita's recordings across borders, connecting Tokyo's experimental scene with kindred spirits worldwide. Age Of 369 documents this confident period - the numerological title invites esoteric interpretation, as 369 appears in various mystical traditions, most notably Nikola Tesla's theories about universal patterns.

The number 369 held particular fascination for Tesla, who believed it held the key to understanding the universe's fundamental structure. Whether Akita intended this specific reference or not, the title suggests hidden mathematical order beneath apparent chaos - a concept that resonates deeply with Merzbow's practice of finding structure within noise. These mid-80s recordings demonstrate increasing sophistication in layering and textural manipulation, pointing toward the maximalist approach that would define the following decade.