Sometimes you have the sound you want, but it just needs a bit of cleaning, enhancement and girth. A beefed up power supply or digital filtering can help. These items, like the Hydra Z, get the digital signal ready for your DAC, and improve things in an instant. They can also increase functionality, if you are leaving a source SPDIF but want to enter your DAC USB. Basically these wunderkind products put a smile on your digital.