The SoundStandard Graphic Equalisers are versatile, multi-purpose devices with a range of features suitable for live sound and permanent installations. There are four models available - three standard and a forth with individual band clip indicators. The standard models include the: 2215B Stereo 2/3 Octave; 2231B Stereo 1/3 Octave; and 3231B Stereo 1/3 Octave with HPF and LPF. The forth model is the 3231FB 1/3 Octave which has additional individual band clip indicators offering visual feedback to the operator for controlling "problem" frequencies. The graphic equalisers come with a range of input, output connectors and offer exceptional value.