Three times as much or as many; in music, the higher range of notes.
From Old French *treble* “triple,” from Latin *triplus* “threefold,” influenced by Latin *triplum* in medieval music for a three‑part voice. The musical sense grew from naming the highest of three voice parts.
When you turn up the “treble” on a speaker, you’re literally boosting the high‑pitched part that used to be one of three main voice lines in medieval music. The word is a cousin of *triple*, just with a musical twist.
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