Boss GEB-7 Bass Equalizer - 7-band Graphic

Features  
The GEB-7 is a seven-band equalizer created specifically for the frequency range of the electric bass. Since the frequency range extends down to 50Hz, the GEB-7 is also great for adjusting depth and bottom end of an upright bass with pickups.  
    * 50Hz to 10kHz frequency range specifically designed for bass     * Full range response, even for five- and six-string basses     * Can be used as a "boost" or "cut" pedal using the level control knob     * Great for eletric-acoustic bass applications     * AC adaptor or 9V battery operation     * BOSS 5-year warranty  

• Nominal Input Level    -20 dBu
• Input Impedance    1 M ohms
• Nominal Output Level   -20 dBu
• Output Impedance    1 k ohms
• Output Impedance    1 k ohms
• Residual Noise Level    -100 dBu (IHF-A, Typ.)
• Variable Range   Equalizer Control: +/- 15 dB, Level Control: +/- 15 dB
• Connectors    INPUT Jack, OUTPUT Jack, AC Adaptor Jack (DC 9 V)
• Power Supply    DC 9 V: Dry Battery 9 V type (6F22/9 V), AC Adaptor
• Current Draw    16 mA (DC 9 V)
• Accessories   Dry Battery 9 V type (6F22/9 V)
• Option    AC Adaptor (PSA-Series)

Size and Weight ( incl. battery )

• Width    73 mm    2-7/8 inches
• Depth    129 mm    5-1/8 inches
• Height    59 mm    2-3/8 inches
• Weight    0.4 kg    1 lbs.