Sugarbrie makes a good point regarding differences in hearing ability. Humans have vastly different amounts of taste buds, making some people "super tasters". I bet that there is an audio equivalent. I think Carl is probably correct about the PS Audio 300. I have not heard it for myself, but regenerating power makes sense to me. Without posting a resume I trust my ears, and 30 years experience, and I have heard a modest improvement from my Monster HTS-3500, and significant improvement from my Harmonic Technology power cords. It also makes sense to do something about what you can control, instead of saying it is useless anyway, which seems to be Snobgoblin's point. Psycosomatic? Nonsense! Yes, expectation can cause people to project their desire into their judgment of a product, but most of us here are big boys with a lot of experience, think for ourselves, and are not victims of our imagination or industry hype, thank you very much. Hey Snobby, where did you go? It is only fair to answer Dekay's request for info on what products you have tried.
The fallacy of ac treatment
I see a lot of threads related to managing and tweaking the ac powerout end of electronic systems. Much has been said about dedicated wiring, termination and even the right kind of extension cords to use. I work for an electric utility; and that's the extent of my credibilty here. The majority of you will no doubt be far more erudite wrt music hardware. Just a thought, though: domestic ac distribution goes thus: power station-step up-city-step down-subdivision-final step down. As far as the utility is concerned, you and all your neigbours are collectively the load for the step down tranformer. Any inductance/capacitance created by your neigbour running motors/tubelights, etc is felt by the lot of you. Additionally, the voltage frequency will almost always move around a tolerance from 50hz as the whole country turns on the air, off the lights - changes all the time as peaker plants ramp up etc. Nothing can change that- the frequency of the grid supplying your city is the frequency in the mains at your house. So what's my point? Well only that how much difference can the last 10 feet of cabling, etc make when the other hundreds of miles are outside of your control? And more importantly, frequency is one of the most imp parameters for measuring electricity quality (your expensive hand-coiled toroids are entirely subject to the f in the primaries) and nothing other than running an f generator can shield you from that. Methinks all the improvements you see from ac cord treatments are pyschosomatic. But that's cool.