As an Electrical Engineer myself, I can attest to Stan Warren's abilities. He is the only, and I mean only modifier, that is offering a custom designed ,proprietary output stage, that is world class by any standard, in the audio world today.
There are many things you can do to modify these players, different caps, jacks, wires, power supplies. But the single largest improvement in sound quality comes from stripping out the stock output devices, and replacing them with much better performing gain stages.
To my knowledge, all other modifiers are just swapping the output devices with better IC's, or other types of "drop in" replacement gain stages. This is not nearly as heroic, as actually giving you an entirely new esoteric circuit, that has world class slew rates, settling times and symetrical electrical behavior.
If Stan Warren charged nore for his services, I feel that many more audiophiles would take him more seriously. He is that good!
