You can power the Bass Attack 2 with a two AA batteries, a standard DC power adapter, or by applying standard 48V phantom power. You can use which ever power source is most convenient, however, you should keep in mind that there are, from time to time, trade-offs. You may have a well grounded live sound or studio set-up that will not exhibit ground loop problems, but when you are on the road or in other studios you may experience ground loops which can result in hum.
You may want to consider using a battery to keep the grounds from the Bass Attack 2 isolated from the grounds the rest of your gear because of possible ground loops. You can check the phantom or AC operation with a quick sound check to listen for any buzzing. If there is no buzz you have a well-grounded system. If you hear buzzing, go to battery operation.
The Bass Attack 2 may be powered by two AA batteries. To install the batteries, open the battery door on the bottom of the Bass Attack 2 pedal. Slide the batteries into the battery compartment. Be sure to observe the positive and negative polarity markings when inserting the batteries. The pedal will not turn on if the batteries are installed incorrectly. Replace the battery compartment cover.
Using AC/DC Power Adapter
You can power the Bass Attack 2 using an optional 9V power supply available from your local Hartke dealer. Simply plug the power adapter into the DC inlet and then, plug the power adapter into a standard AC mains outlet.
Using Phantom Power
Using Phantom Power If you are connecting to a mixer that has phantom power, the Bass Attack 2 can be powered by connecting a standard mic cable to the Direct Output. Be sure to check that the mixer’s phantom power switch is set to the “on” position. Then, make sure that the LIFT/GROUND switch is in the GROUND position so that phantom power is enabled.
The LIFT/GROUND switch provides two functions at the same time. In the GROUND position, the switch connects ground on the XLR cable, and by doing that, the switch also allows the unit to be powered by a phantom power supply. When the switch is set to the LIFT position, the ground is disconnected, and therefore, the phantom power operation is disabled.