Aguilar Tone Hammer Bass EQ Effect Pedal Footswitchable 3-band EQ with sweepable midrange and AGS circuitry Unbalanced output can drive a power amp EQ: Bass +/- 18 dB @ 40 Hz. Mid +/- 17 dB @ 180 Hz to 1 kHz. Treble +/- 18 dB @ 4 kHz Inputs: One 1/4-Inch jack Outputs: One 1/4-Inch jack, One XLR (nominal output - 14 dBu balanced) Powered by two nine volt batteries, phantom power or optional universal power supply