equalizer

/ˈikwəˌlaɪzər/
noun
  1. A device or software that adjusts the balance of different sound frequencies in audio.
    • He used a graphic equalizer to boost the bass on his car stereo.
    • The sound technician adjusted the equalizer to reduce feedback from the microphone.
    • The music app has a built-in equalizer with preset modes for rock and classical.
  2. Something that makes conditions or opportunities more equal, especially in sports or competition.
    • The new rule was an equalizer, giving smaller teams a fairer chance to win.
    • In soccer, a late goal can be the equalizer that ties the game.
    • Education is often called the great equalizer because it can lift people out of poverty.