Boss GEB-7 7 Band EQ Bass Guitar Pedal

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.

More Details: https://www.boss.info/us/products/geb-7/features/