Equalizer circuit diagram supplied as a 263 KB PDF. The file name only says equalizer and gives no brand, model or board reference, so it cannot be tied to a particular…

Schematic of a 5-band graphic equalizer in a small 16 KB PDF, with a YMYA tag in the name that may refer to the source or the designer.

Compact PDF schematic whose name points to a parametric equalizer combined with a subwoofer filter stage.