Check the listing for details. DBX 131s Single Channel EQ Professional 31-Band Graphic Equalizer. Condition: New. Listed at 239.00 USD. DBX 131s Single Channel 31-Band Graphic Equalizer The 131s from dbx is a single channel, 31 band, 1/3 octave graphic equalizer housed in a single space, rack mount chassis. The processor is equally suitable for live applications, audio installations, and for use in a studio. The unit features 20mm non-conductive sliders that can be set to either +/-6dB or +/-12dB of boost or cut. A global control provides +/-12 dB of input gain. A 12dB per octave, 3dB down at 50Hz low-cut filter can also be switched in if required. From its extended frequency response and excellent dynamic range, to the quality components and meticulous attention to detail, the 131s offers exceptional sound and rugged reliability. Single, 31-band, 1/3-octave constant Q graphic EQSwitchable boost/cut ranges of +/-6 or +/-12dB20mm non-conductive sliders12dB per octave, 3dB down at 50Hz low-cut filter+/-12 dB input gain rangeFront panel bypass switch4-segment LED ladders for monitoring output levelsXLR and 1/4" TRS inputs and outputs