Just tied a square knot in the lamp cord. Don't hear anything. It's still silent. Like a lamp should be.
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Actually, I can imagine there being an audible difference. Two things that are happening is that the inductance is being increased and it's probably affecting the capacitance to a degree. Vary one or the other or both and sonics can certainly change and be heard in a good resolute system. As for whether this is an improvement in perceived sound can only be in the "ear of the be-hearer".
There's more explanation that could be expounded on but I think this is a good brief. Hope that helps a bit.
Ridgestreetaudio has it right - the rest of you guys are just having fun. I believe it was Martin Colloms who once pointed out that all these high end power cords were merely introducing inductance through their geometry to roll-off high frequency noise, while not reducing current flow, and that most else about them was BS.
A small Panasonic digital receiver that I messed around with (similar to the SA-XR25) has a small coil if several turns wound into the line cord, and secured with a plastic wrap. The manual warned the user not to unwind it.
I think this is to meet international specs regarding how much noise a device can feed back into the power line. The device in the cord is called a RETLIF (filter backwards).
I doubt it has an effect on the equipment itself, but may prevent your microwave oven from burning dinner.
It does seem that many audiophiles do believe that line cord inductance affects the sound, so this tweek is a great idea to save lots of money. Why don't we investigate the best kind of knot to tie? Does a square knot sound different from a clove hitch? Get out your Boy Scout manual and have some fun :)