DBX 1231 Dual 31 Band Graphic EqualizerThe dbx 12 Series were designed to meet the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls. The 1231 provides standard features like dual channels, 31 1 3 octave bands, ISO frequency centers, + 12 dB input gain range, and switchable 40Hz 18 dB per octave low cut filters, but also includes other insightful features. These include 45 mm faders; selectable + 6dB or + 15dB boost cut