Glad to clear that up!
As far as the greatest improvement, HD cable sees by far the greatest improvements, but SD cable and DVD stand improvements as well especially with the color accuracy.
From their website referring to Clean Power Ver 2.0: (my ver 1.0)
"Building upon his revolutionary Clean Power ™ Circuitry breakthrough, world-renowned AC power authority Richard Marsh introduces Clean Power ™ v.2.0, which delivers improved filtering and isolation of polluted AC power to Monster’s HTS 5100, for even better picture and sound. So you’ll see the most vivid video possible and hear more natural sound with increased dynamic range and less noise."
"Polluted" AC power can degrade the audiophile performance you expect from your home theatre components. Unless you live directly behind Hoover Dam, your AC power is most likely "polluted" by appliances sharing the same power line with your home theatre components. Electrical power tools, refrigerators, air conditioners, radio transmitter, cellular phones, microwave ovens, even your neighbor's freezer, all generate electromagnetic interference and radio frequency noise which pollutes the AC power and degrades audio and video performance. Even your other home theatre components generate noise interference-adding more "pollution" to your AC power. As a result, you'll hear a loss of dynamic range and resolution with a compressed soundstage and imprecise imaging. You'll see less color detail and sharpness in your TV picture quality. And you'll never know how much of the essential drama is gone in the high performance picture and sound your home theatre was designed to deliver. Monster's Clean Power Circuitry filters "pollution" on the AC power for improved sonic performance and picture resolution. Designed by world-renowned AC power expert Richard Marsh, Monster's Clean Power Circuitry employs special non-resonant filters to reduce RF, EMI and other distortions on your AC power line. The results give you dramatic improvements in sonic performance and picture resolution. Your music and sound will seem to emerge from a "blacker" background, rather than a "gray area." Midrange textures become more liquid and balanced. A sweeter and brighter treble sweeps the high end without harshness or a metallic character. Sound staging improves with greater transparency, tighter image focus and a well-rendered soundstage depth. Your picture resolution will be sharper with less color shift."
Very, very rarely does a product work as advertised, but I must admit this product actually does work. I still can't believe it.