Stebbo makes an interesting point and one that I, with my inability to hear the miraculous effect (or indeed any effect) from Mana, or Eupen power cords or now the DeMagic disc, have often mulled - the fact that we hear what we want to hear. As he says, we have a brain (well, most of us, we'll exclude the current incumbents of the White House and similar folks) and of course sound exists only in the brain, not in the atmosphere outside. It's the brain that analyses the vibrations at the eardrum and converts them into what we hear. The fact that we all hear differently means that this is where it all happens - it may have nothing to do with the equipment or the tweak. Does anyone know of any studies into this sort of thing?