The Voodoo Lab HX Current Doubler Cable combines two high current Pedal Power outputs (400mA or greater) to power Line 6 HX Effects, Stomp, or Stomp XL. This cable features two BLACK 2.1mm barrel plugs to a single BLUE 2.5mm plug for use with standard center-negative polarity pedals. Recommended for use with Pedal Power X8, Digital, 4X4, MONDO, or Pedal Power 3 series supplies. Please note that this cable will not combine the voltages of the original outputs. Only the current supply will be combined.