Thursday Morning Riddle

Archimedes once tested me in a gold crown;
I’m one book of the seven in J.K.’s renown;
When I’m low, I could cause a whole sales force to frown;
But when music’s too loud, you just might turn me down!

Who am I?

UPDATE: Riddle solved by Brian. See comments for answer.

3 Responses to “Thursday Morning Riddle”

  1. Brian Says:

    Volume

  2. Bill Says:

    VOLUME is correct. Way to go, Brian!

  3. DeLisa Says:

    Brilliant, brilliant riddle.

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