Have to agree with Bob b above. An easy simulation is to use a quality 12 gage extension cord plugged into your laundry outlet (with laundry appliances unplugged of course) and run to your rig. Not quite ideal with the extra recepticle and plug, but a good simulation of what a dedicated line can do.
Dedicated line vs. power conditioner
I've pretty much found the gear for my "keeper" system. Now, I'm turning my attention to the little things that make a system sound its best. Which is the better tweak, running one or more dedicated power lines to my audio gear, or investing in a high quality line conditioner? I've heard arguments both ways. Some say the line conditioner is better because there is "junk" coming in even with a dedicated line. Others say you'll never know true power and dynamics without a 20 or 30 amp line. Any thoughts?