Try to keep the powercords away from the other signal cords.
If they have to touch, try to keep the crossing at right angles.
I use the 1" foam plumbing pipe insulation, cut into 2" sections. and use it just to keep the wires from touching each other.
I also use thin snippets of the foam as rings slipped over the speaker cables to keep them off the floor by 1/4 inch.
The idea is to minimize materials interaction.
$100. ceramic dodads are no better than the foam pipe insulation (which is about a buck for three feet at any hardware store.
It does seem to help clarity in the high frequency range.
And eliminats hum.
If they have to touch, try to keep the crossing at right angles.
I use the 1" foam plumbing pipe insulation, cut into 2" sections. and use it just to keep the wires from touching each other.
I also use thin snippets of the foam as rings slipped over the speaker cables to keep them off the floor by 1/4 inch.
The idea is to minimize materials interaction.
$100. ceramic dodads are no better than the foam pipe insulation (which is about a buck for three feet at any hardware store.
It does seem to help clarity in the high frequency range.
And eliminats hum.