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Noun: expander  ik'span-du(r)
  1. An electronic device that increases the dynamic range of the audio signal.
    "Expanders are generally used to make quiet sounds even quieter by reducing the level of an audio signal that falls below a set threshold level."
  2. Anything which causes expansion esp. a tool for stretching open or expanding a tube, etc

Derived forms: expanders

Type of: electronic device

Part of: compander, compandor

Encyclopedia: Expander