I also remember well the first time I told my friends that changing a power cable in an amplifier made a significant difference, and not only that, you had to break in the cable for a couple of months and the sound got even better. They were about to take me to see a Psychiatrist. ...
Yeah. I find that I get better colour saturation in my photos when I use an oxygen-free USB cable. Not to mention that new $600 power cable for my printer. Oh my gawd. What an improvement.
