Dual 15-band equalizer 20mm oiled sliders with switchable range accurate constant Q center frequencies Dual 15-band ... equalizer 20mm oiled sliders with switchable range accurate constant Q center frequencies Separately variable low ... 15 bands (2/3 octave)×2 Center frequency 25,40,63,100,160,250,400,630, 1K,1.6K,2.5K,4K ...