Esigned to tilt upwards on the stage if you should want it to—and thus, earning its name in the process—the Kickback KB12 from Hartke is a 500W combo amplifier intended for electric basses. It utilizes class-D amplification technology, and a 12" HyDrive speaker to deliver a powerful sound. The input jack can accommodate both active and passive basses, and the on-board three-band EQ will let you dial in a variety of tones, augmented all the more by the shape-control circuit. When engaged, this switch applies a 20 dB filter to a given frequency area adjustable via a knob to the right of the switch.