The 131s graphic equalizer includes a single 31-band channel of 1/3-octave equalization, +/-12dB input gain, switchable +/-6dB or +/-12dB boost/cut range, 20mm nonconductive sliders, an intuitive user interface and output level metering. From its extended 10Hz to 50kHz frequency response and 110dB 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. Sure to find a home in the studio, on tour and with installed sound venues, the 131s is destined to take its rightful place in the lineage of great dbx signal processors that are the professional's choice in signal processing. With such affordable quality, there's no longer any excuse for compromising your sound. The 131s meets the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls.