The Daisy-chain cable enables you to use multiple Wunder Audio 19″ rack unit from the same PSU. Just plug it into the DC output of the first Wunder Audio 19″ rack unit and into the DC input of the next Wunder Audio 19″ rack unit. It is used with any combination of the PEQ1R, PEQ2R, PAFOUR, and PAFOUR Plus.
