Acting original dbx 131 equalizer

131 single paragraph 31, 1/3-octave, constant Q band 231 pairs of 31, 1/3-octave, constant Q band 215 pairs of 15 sections, 2/3-octave, constant Q band switchable ± 6dB or ± 12dB boost / cut range 131/215: per octave 12dB, 3dB decrease of 50Hz low-end cutoff filter 231: per octave 12dB, 40Hz low-end cut filter Front panel bypass switch ± 12dB input gain adjustment range monitoring output level 4-segment LED display rung XLR and TRS input / output connectors internal toroidal transformer frequency response of 10Hz to 50kHz signal dynamic range greater than 108dB