The DVA R2X is a single-ended to differential converter (i.e., unbalanced to balanced converter) for audiophiles.
It's the perfect solution for using single-ended preamps with differential (i.e., balanced) power amplifiers, including our own.
It has one stereo pair of RCA input jacks and a stereo pair of XLR output jacks. It has a gain of two (i.e., one volt input will yield two volts output) and a maximum output over 20 volts (zero to peak).