The Effects Bakery Maritozzo Bass EQ is a graphic equalizer that adds a base tone to your body. The 5-band slider and VOL-adjust the overall level, and the MASTER control control for the final volume allows you to slightly change the tone or loud tone The five sliders can be wide-range boost/cut at 12.5, 125, 500, 1K, and 4K respectively. All faders have a click in the center so you can quickly get back to the center without having to see the memory fine. The Maritozzo Bass EQ is individually set with VOL and MASTER. VOLs adjust the overall level of EQ adjusted with faders and ultimately adjust the volume with the MASTER. This means that you can actively adjust the tone with EQ and LEVEL without worrying about the difference in volume when turned on or off, and finally adjust the volume with the MASTER, so you can separate the sound making and adjust the volume. This means that each band has a wide adjustment range of ±18 dB for maximum tonal adjustment. ●Control MASTER: Adjust the overall volume. LEVEL: Adjust the output level of the entire EQ. Fader: Adjust the boost/cut from ±18dB around 12.5, 125, 500, 1K, 4K Maritozzo Bass EQ is powered by a standard center negative DC 9V adapter. Does not use batteries. Current Consumption: 16mA; Input Impedance: 470K; Output Impedance: <10K