Cheap Powercords...worth the effort???

It takes a minimum of about 5 or 6 feet for the "filtering" factor of power cord to work.

Filter what? And how?

I want to put in another vote for BMI. I just "got into" power cords last momh after hearing waht a Master Coupler did for my preamp. After doing some research, I decided to take a chance on BMI's EEL power cord, and am now on my fourth one (pre, dac, and monoblocks). There may be better cords out there, but for a LOT more money (even used). On my BAT preamp, the EEL clearly bests the Master Coupler. On the plus side, Brian introcaso (Mr. BMI, since he answers the phone AND makes every cord by hand!), is an absolute delight to deal with. I plan to keep buying EEL's until I have one on every relevant piece of equipment (need four more!) before venturing up in the price scale

Dievoyager, a power cord's design and materials can help eliminate RFI, therefore "conditioning" the power being supplied. Some people prefer to use high quality power cords without line conditioning. There are others at this site more skilled in the engineering and design aspects of power cords than I am, and I am sure they can offer a more detailed explanation.