My Pass X0.2 preamp is a 3 chassis unit. Power supply and controls are in one chassis and the left and right audio channels are each in a seperate chassis. You need a single XLR cable to provide an audio link between the two audio chassis if you want to use the switchable mono option.
I didn't want to waste a stereo interconnect on this and I had a spare Tara digital XLR cable on hand. It works just fine.
A digital cable is designed to handle frequencies much higher than the audio range with constant imprdance and will have no trouble with audio frequencies.
