Tvad is right, but before you start your research, here's a guide to the main groups:
Power Conditioners: A little like hair conditioners. Smooth things out (filters), repel dirt (EMI and RFI) and provide anti-static protection (voltage spikes.) They can't provide voltage or AC frequency (60 cycle) accuracy. And they provide what attributes they do provide, some think, at the expense of sonics.
Power Regenerators: These devices do all the things that conditioners do, but instead of employing passive filtration, they do it using active electronic circuitry such as signal generators, linear amplifiers and feedback loops to regulate the wallpower. What you get is what (in a perfect world) would/should come out of the wall.
Balanced Power Units: These units have been in use for years in studios but only UL Approved for consumer use for about 12 years or so. They reconfigure the 120V-to-neutral plus ground conventional power layout, into 60V-to-neutral-to-60V. Thus creating a noise-free (self cancelling) conductor layout just like XLR balanced interconnects do. Primarily used with lower powered more sensitive front-end (source) stuff, but can be used with amplifiers too. Excellent when combined with a regenerator unit. For more info on the hows and whys of balanced power, go to the Equi=Tech website at: www.equitech.com
