This unit accepts power from the 9VAC/1.5A adaptor supplied with the unit. This 9 volt RMS AC
voltage is internally processed by a voltage doubler which generates a bipolar ±15 volts to maintain
the headroom and sound quality of professional, studio quality equipment. Using an external power
source such as this minimizes excessive noise and hum problems often associated with internal
transformers, providing optimal performance for the user.