The dbx 231s Dual 31-Band Graphic EQ is the end-result of a quest for exceptional sound, performance and reliability. Dual-channels, 31 - 1/3-octave bands, ISO frequency centers, ±12dB input gain range, switchable 50Hz/12dB per octave low-cut filters, 20mm faders, selectable 6dB or 12dB boost/cut range, XLR and TRS connectors, nonconductive nylon sliders, and balanced inputs and outputs for quiet operation. 2U rackmount. dbx 231 Dual 31-Band Graphic EQ Features: Dual 31-band, 1/3-octave constant Q-frequency channels Switchable boost/cut ranges of 6dB or 12dB 12dB per octave-per-octave 40Hz Bessel low-cut filter Front-panel bypass switch ±12dB input gain range 4-segment LED ladders for monitoring output levels XLR and TRS inputs and outputs Internal toroidal transformer Frequency response of 10Hz-50kHz Dynamic range of greater than 108dB Signal-to-noise: 90dB We carry the full line of DBX. If you need a piece that is not listed on our website, call for a price.