Equalization (audio)
（重定向自Parametric equalizer）
![A stereo graphic equalizer](/Images/godic/202502/01/Graphic_equalizer2852.jpg")
![The very uneven spectrum of white noise played through imperfect speakers and modified by room acoustics (top) is equalized using a sophisticated filter using digital hardware (bottom). The resulting](/Images/godic/202502/01/Roomcorrect-mag2852.png")
![Two first-order shelving filters: a -3 dB bass cut (red), and a +9 dB treble boost (blue)](/Images/godic/202502/01/Shelving-eq.svg2852.png")
![Second-order linear filter functions. Blue: a 9 dB boost at 1 kHz. Red: a 6 dB cut at 100 Hz having a higher Q (sharper bandwidth)](/Images/godic/202502/01/Peaking-eq.svg2852.png")
Equalization (British: equalisation) is the process of adjusting the balance between frequency components within an electronic signal. The most well known use of equalization is in sound recording and reproduction but there are many other applications in electronics and telecommunications. The circuit or equipment used to achieve equalization is called an equalizer. These devices strengthen (boost) or weaken (cut) the energy of specific frequency bands.