Boss GEB-7 Bass Equalizer

PRECISE TONAL CONTROLThe 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 five-year warranty SPECIFICATIONS Nominal Input Level: -20 dBu Input Impedance: 1 M ohm Nominal Output Level: -20 dBu Output Impedance: 1 k ohm Recommended Load Impedance: 10 k ohm or greater Bypass: Buffered bypass Controls:  Level Control knob Equalizer Control knob 50, 120, 400, 500, 800, 4.5 k, 10 kHz Pedal switch Indicator: CHECK indicator (Serves also as battery check indicator) Connectors:  INPUT jack: 1/4-inch phone type OUTPUT jack: 1/4-inch phone type DC IN jack Power Supply:  Carbon-zinc battery (9 V, 6F22) Alkaline battery (9 V, 6LR61) AC adaptor (PSA series: sold separately) Current Draw: 16 mA Expected battery life under continuous use:  Carbon: Approx. 16.0 hours Alkaline: Approx. 28.5 hours *These figures will vary depending on the actual conditions of use. Accessories:  Owner's Manual Leaflet ("USING THE UNIT SAFELY," "IMPORTANT NOTES," and "Information") Carbon-zinc battery (9 V, 6F22) Option (sold separately): AC adaptor: PSA series SIZE AND WEIGHT Width: 73 mm(2-7/8 inches) Depth: 129 mm(5-1/8 inches) Height: 59 mm(2-3/8 inches) Weight (including battery): 440 g(1 lb)