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I already have 4 dedicated lines with hospital grade sockets. I will be adding power/line conditioners as soon as I can afford them.
Several companies are releasing new power-conditioner products these days, some with radically new technology. Are you using them?
Taralabs ISM Shield power strip. One of the best RF/EMI removers I have used. This is not really designed to be a power Surge protector or spike protector like the Cinepro 20 which I have used in the past. But if you have front end with multiple regulation stages that need fast current on demand without the added toroidal slow down this may be the best solution for the cost.
I use EMI/RFI Corcom filters and GE MOV surge suppressors on the AC line. So far the use of a full line conditioner or UPS package has not been required. The Corcom units come in a variety of ratings and filter characteristics that can suit the particular component. I found using one per AC plug worked best.
What about the wiring behind the wall? What's the use fixing what is wrong before getting to your wall plug? Before getting any conditioner or monster mains cable, it is more advisable to call the electrician and have him check your wiring and connections. Better and cheaper!
I've used Tice conditioners for years in my high-end system, multiroom, and home theater. Power conditioners are among the best values in the industry. They can improve every component in your system, except some big amps. The only thing that's cheaper and as effective is speaker placement! Don't buy new cables or a new DAC until you've tried a couple of power conditioners.
I have evaluated several 'well reviewed ' products. Do they work...well yes but at the expense of other key areas such as tonality. Better to buy better equipment first then go to a power conditioner, remember that a power conditioner won't fix any problems with the design or quality of your equipment.
MIT Z-Center: definitely works in my home. I had tried the following, which either made zero difference or were very good with limitations: Chang in 1995, Bybee in 1997. I strongly believed that the MIT product made the sound better all around. I did try to buy an MIT Z-Center used, but when I brought it home, it didn't make a difference. (I told the owner to send it back to MIT to check it out, as I know for a fact that it does magic.) I ended up buying it from somebody else in the used marketplace. I also own the new Monster Power for my second system.