Simple - Higher voltage levels result in more headroom. When you boost the voltage you find your Xotic pedals will get much more dynamic, more headroom, top end and brightness, less compressed sound. Boosting the Bass BB Preamp and Bass RC Booster sounds great with bass guitar with the extra headroom and clarity.

Simply plug in the power adapter to your existing power source, switch the voltage to either 15 or 18 volts and plug into your pedal. Delivers clean, consistent power with the lowest possible noise.