1. The higher frequencies of the audible spectrum.
     
  2. Refers to the higher frequencies. Technically, the treble clef in music is for frequencies above 329 Hz (E above middle C), but in equalizer terms refers to higher frequencies typically above 4kHz.
    Source: [http://www.allchurchsound.com/ACS/glossary/index.html Church Audio & Acoustics Glossary]
[[Category: Acoustics]]