You seem to be making an assumption that your wall faceplate is a dedicated circuit. Unless you required your electrician to install it this way, it most likely is not and is shared by other faceplates in your home (the number depends on local code). The danger here is noise from other devices and voltage sags. In the early evening (and when your air conditioning is on), check your voltage at different times with a radio shack multimeter when your system is on. You should always see 115 volts. If you see less, you may improve your sound with installation of a dedicated circuit, and further, specify 20 amp, and isolation grounding to further reduced noise and lower cable resistance (common in commercial and computer applications). Then, get a quality filtration/conditioner device to plug in all of your equipment. This all really helps and the circuit should cost between $90 and $150 depending on how much effort to get the wire to the faceplate location. I am not a tweek-freek and think alot of that stuff is a little silly but I am really big on good, clean power. It has made big improvements for me in all of the places I have lived.
AC line conditioner +dedicated outlet
I have a wall plate with four outlets, one for each amp(2) do I still need a line conditioner such as the iPower ipc-12 to hook up my other components or can I just use a good surge protector? Thanks for your help. Gear is Lexicon, (2) ATI amps,Pioneer DVD, Adcom cdp,Toshiba VCR,Velodyne F1500R powered sub and Dish satt., Mitsubishi 50" HDTV. Thanks for your help.