ART’s 351 Single Channel 31 band 1/3 octave graphic equalizer features constant Q circuitry with a 3% center frequency accuracy, 20 mm center detent sliders, and selectable boost/cut range of 6 dB or 12 dB. The high pass filter rolls off lower frequencies which is useful for decreasing rumble or low frequency hum, adjustable from 10 Hz to 250 Hz. The low pass filter rolls off higher frequencies, adjustable from 3 kHz to 40 kHz. The rugged, all-steel chassis occupies 1U rackspace.The 351 graphic equalizer is a powerful tool for solving a number of audio problems and creating interesting sound textures. Patch the EQ between your mixing console and power amps to allow you to alter the overall mix to better match your environment. Use the 351 between your monitor mixer and monitor power amps to aid in the removal of feedback inducing frequencies. Patch into a channel insert to EQ one channel or track individually. Run your instrument directly into the equalizer to enhance its sound before reaching a power amplifier or instrument amplifier. Patch the 351 into the effects loop of an instrument amplifier or between a preamp and power amp to have precise control over the complete sound. Single channel 31-band graphic equalizer Constant-Q filtering Balanced XLR, active balanced 1/4″, and unbalanced RCA input and output connectors +/- 6 dB or +/-12 dB level adjustments 20 mm center detented frequency band sliders Independent level and bypass controls per channel Bypass switch High-pass and low-pass controls 120/240 volt switch Rear panel ground lift switch LED clip indicators Designed for years of continuous, reliable performance Rugged all steel construction