Radio Design Labs’ Stick-Ons are compact, high-quality audio interface devices that can be directly and discreetly mounted on equipment, under counter tops, or combined in rack mount systems. The ST-EQ3 is a 3-band equalizer. Equalization is accomplished by three active circuits, each controlling a separate audio band. It also features a bridging input, which may be connected unbalanced if desired. Requires 24-volt power supply (PS24A sold separately).