Power cord into power amp

I have had the same experience. It appears that power conditioning is a system to system thing. In general those of us with dedicated lines find it makes things worse. I can remember thinking my Tice Power Block helped on other components beside power amp when I was not using a dedicated line. There are several possible reasons I can think of and probably a lot more. One is that the conditioner does not have sufficient capacity for the amp. Amps can draw really amazing amounts of current for short periods of time. I just replaced the power cord on my Musical Fidelity NuVista amp , which was large, with a much larger one and got an immediate and very noticeable improvement. But others have reported little or no improvement by changing power cords. In HIFICritic recently a stock cheapie cord outperformed some expensive ones on a CD player. On Power amps the high priced ones were better. A whole group of reasons can be lumped together under the heading " Don't put anything in the line that you can leave out" You may be improving on area at the expense of another. There is so much out there on this that all I can say is that there is simply no consensus on almost any aspect of it. There are several interesting approaches, The "Never Connected" method interests me. But unless you have a large amount of time to spend doing research on it the best thing is to use what sounds better and forget about it.

This only prove that Isoclean filter is NO good even though it is expansive. This doesn't apply automatically to ALL other power conditioners on the market.

Give the PS Audio's Duet a try. It is on sales for only US$199 right now and you will be amazed of the improvement to your power amp.

I have a similar Isoclean setup as you (3030G & SF cables) and have experienced exactly what you did with the filtering within the Isoclean -- loss of dynamics, bass and soundstage. Therefore, I went with one of their power bars (non-filtered).
I'm not sure how to explain it other than it must take away AC noise & some grunge as I call it & in so doing decays or muffles frequencies (maybe a little grunge is necessary????). I'm unable to explain anything about power cord theory -- so, you're expecting too much if you're looking for a direct answer why.

As far as a Duet -- I have one, tried it and it did nothing for me -- so instead of selling it, I relegated it to the flat screen and DirecTV receiver.

Dtsag,

What are you smoking?

The Isoclean has made a major impact on my system but not on the power amp.

PS Audio for you but not for me.