I have not used the PS audio but I have a Hydra 4 and use it with an Arcam CD33. Of all of the audio that I have tried the Hydra has made the biggest improvement in my system, especially with the CD player. It is much more musical, the sound stage depth is much deeper. It is cool to hear instuments comming from 3feet behind the speakers. I also hear notes and subtle instruments that I cannot hear when I remove the Hydra.
