undermodulate

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un·der·mod·u·late

U0054200 (ŭn′dər-mŏj′ə-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·la′tion n.