Donner Equalizer Pedal frequency centers: 100Hz, 250Hz, 630Hz, 1.6 KHz, and 4 KHz. No matter what you want, like connecting to a full range pedals or just finely adjusting you tone, you can receive a master volume control of individual frequencies with complete precision from the Donner Equalizer pedal. It is specifically designed for the guitar players, and this five-band graphic EQ features a ±18 dB adjustable gain range per band, which help the players to shape their sound over five specific frequencies in order to preventing feedback caused by additional distorting effects.