What kind of power strip (using the term loosely) are you using on your carts? I don't have a particularly special one.
My setup is: wall or geni power -> power strip -> cart power distro box -> expensive gear
I have my AA and 9volt battery chargers in the power strip as well. Should I have a specific power strip? By that, should I have one with a high protection threshold, or noise filtering abilities?
I will probably be upgrading the cart power next year (probably something from Remote Audio or PSC). I never noticed any kind of line noise that was because of my AC power. Have I just been lucky? I know that no power strips are 100% effective, but should I be using something better than the fairly generic computer/electronic surge protector I have?
Some of my friends that do sound reenforcement type setups can't say enough about the problems they solved by upgrading their power conditioning units. We're in a different situation, but I am not sure if it's luck that I have been ok so far.
Offhand the only issues I ever encountered were a charger you could "hear" when it was cycling off an on. I also had an issue when I was trying to use a pure sine wave inverter, the first one I tried caused a terrible buzz that was only fixed by replacing the unit.