Dedicated line vs. power conditioner

Simply unloading the multi-tapped house circuit will absolutely not come even close to comparing with the superior performance of a properly engineered dedicated line. There are normally multiple connections & wire splices along the way through the house to that 'outlet of interest'.
However you can compare by running a "temporary dedicated line" strung across the floorboards etc. to your rig, but be prepared to follow up with a permanent installation because once you hear it, you won't put up with house wiring ever again.

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.

Alex has a great idea. Per The 1999 National Electrical Code, 210-11, C -2.

Laundry Branch Circuits: In addition to the number of branch circuits required by other parts of this section, at least one additional 20-ampere branch circuit shall be provided to supply the laundry receptacle outlet(s) required by Section 210-52(f). This circuit shall have no other outlets.

Thanks everyone for your advice, experience and suggestions. Sounds like the dedicated line is the better way to go. Now for my next question: How do I explain to my wife that the "perfectly good" outlets in my listening room need a $300 upgrade?...

What if you're living in an apartment building? What options would I have, if any? I currently own a Tice AV Solo and bought a Leviton 20 amp hospital grade outlet.