The EQU131-MKII V2 from Alto Pro Audio is a single channel, 31 band 1/3 octave graphic equalizer. The sliders are 20mm center detent with a selectable boost/cut range, and the unit provides balanced and unbalanced input and output connections, fixed high pass and low pass filters, a variable input level control, clip level indicators, a ground lift switch, along with an internal universal power supply.

The unit has EQ bypass switch with LED status indicators, and is housed in a rugged, all-steel 1U rack space chassis. The EQU131-MKII V2 is intended for installation in standard 19" equipment racks and provides multiple input and output configurations. The XLR and 1/4" TRS connectors use balanced, low noise circuitry but can also be used in an unbalanced configuration. The RCA jacks are unbalanced.

The EQU131-MKII V2 may be used in a variety of applications such as live sound, recording studios, instrument racks, as well as any conventional fixed installation environment.