Im currently using cheap philips speaker cable wich I find it is bright and doesn't tame the bright sound of the Yamaha AX-397. It is a cable with copper on one wire and the other wire is grey metal (don't now the material,maybe some help here). I´ve changed the cable to a cable that came with a Sony hifi in a box system, ans this cable seems to do the job much well than the Philips cable.this "sony" cable has both wires made of grey metal.So resuming, to tame brightness what is best? copper or grey metal(and somebody teel me the name of the metal wich is grey please lol).Much help aprecciated.