From the manufacturer

GEB-7 Bass Equalizer

GEB-7

PRECISE TONAL CONTROL

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.

Description:-

With a frequency range from 50Hz to 10kHz, the GEB-7 is ideal for any bass guitar, including 5-string basses. Seven bands of EQ are available, affording greater control over the crucial midrange.

Features:-

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

Specification

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	30 mA
Expected battery life underuse	Carbon: Approx. 8.5 hours Alkaline: Approx. 18.5 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)
Options (sold separately)	AC adaptor: PSA series

Weight	0.44 kg
Dimensions	12.9 × 7.3 × 5.9 cm
Product Dimensions	‎12.9 x 7.3 x 5.9 cm; 440 g
Item model number	‎GEB-7(T)
Colour	‎Multi-Colored
Scale Length	‎25 Inches
Signal Format	‎Analog
Neck Material Type	‎Wood
Number of Strings	‎6
Battery Type	‎Zinc
Item Weight	‎440 g
Country of Origin	‎Taiwan
ASIN	B00S0J81CC
Date First Available	9 January 2015
Item Dimensions LxWxH	12.9 x 7.3 x 5.9 Centimeters
Generic Name	Equalisation
Manufacturer	‎Roland