tone control definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a control device, as on a high-fidelity amplifier, for varying the intensity of high and low frequencies
tone control definition by American Heritage Dictionary
A circuit or device in an amplifier designed to increase or decrease the amplification in a specific frequency range without affecting other frequencies.