Man, am I getting old. I remember when PS Audio stood for "Pete and Stan" and these guys were designing and making great sounding equipment up in the land of Santa Maria BBQ. I still have a PS1 (also known as a PS Source) which came either as a kit or fully built. Had the same phono stage as the legendary 4.6. Another way cool feature then were the bag of extra resistors to "tune" the roll off. I still have this preamp. I've heard Stan's CD mods via friends' systems. He's the real deal.