Definition of roll-off in English:

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roll-off

Pronunciation: /ˈrōlôf/

noun

The smooth fall of response to zero at either end of the frequency range of a piece of audio equipment.
Example sentences
  • It has a relatively flat frequency response to 1000 Hz, then a rapid roll-off.
  • A fixed roll-off was engineered into the vintage mic to counteract its gargantuan bass proximity effect.
  • The roll-off is about - 6dB per octave starting at 160 Hz.

For editors and proofreaders

Syllabification: roll-off

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