Wadia’s 151PowerDAC Mini is a sealed compound: DAC, pre-amp and power-amp rolled into one box, all fused together in one clever digital circuit. There are four ways in (ALL digital: USB, optical and two coaxial) and one way out (loudspeakers). There’s no line- or pre-out.
The Wadia 151 PowerDAC is one of those rare reasonably priced products that gives you more than a glimpse of greatness. It’s sound is musically involving and fundamentally solid. Like most such products, it isn’t without tradeoffs, but if you value midrange performance and clarity above all else, you’ll likely love it. Similarly, if you have a room and system where bass control and heaviness are problems, this is one amp/DAC you have to hear.