undermodulate

un·der·mod·u·late (ŭn'dər-mŏjʹə-lāt') tr.v. un·der·mod·u·lat·ed, un·der·mod·u·lat·ing, un·der·mod·u·lates

To use a sound reproduction or transmission device less than optimally possible.

  un'der·mod'u·laʹtion n.

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