The Art 355 dual channel, 31 band 1/3 octave graphic equalizer features constant Q circuitry, with a 3% center frequency accuracy. The sliders are 20mm center detent with a selectable boost/cut range, and the unit provides active balanced and unbalanced input and output connections, adjustable high pass and low pass filters, variable input level control, clip level indicators, ground lift switch, internal power supply with selectable line voltage switch.