trevor79:Using a mains cable does make the Sub more musical giving better definition, have a look in the review section for ideas.
Indeed, I find removal of the mains cable from my equipment makes it a lot less musical. In fact removing the mains cables is a very effective way of removing all electrically generated sound from my listening environment. Switching off my mains supply at the fuse box is even more effective, ensuring that there is no background hum from the fridge or central heating. To be really sure of removing all noise from the system, however, requires action at the electricity sub station level - possible, but likely to get you into trouble.
Before spending any money on power cables ask why even top end, top of the range, equipment is sold with remarkably normal mains cables. Surely if all this made any difference then, say, Sony or NAD would supply something very different as standard as it would give an advantage when the kit was auditioned in a shop?