When the pros need an EQ, they turn to dbx. With a proven track record that spans four decades, dbxÂ® EQs are the industry standard for touring, studios, and audio installations. With the dbx heritage of revered pro EQs, the 131s meets the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls. The dbx 131s includes a single 31-band channel of 1/3-octave equalization, Â±12 dB input gain, switchable Â±6 dB or Â±12 dB boost/cut range, 20mm nonconductive sliders, an intuitive user interface, and output level metering. From its extended 10Hz to 50kHz frequency response and 110 dB dynamic range to the quality componentry and meticulous attention to detail, the 131s offers exceptional sound and rugged reliability that guarantees you will always sound your best.