I'v had my big rig all copper speaker cables 6 years, and another pair 8 years, and as far as I know they sound as good (or better) as when well broken in. And I used a 25 year old length of 6 ga stranded copper as a mainline for a dedicated system, and it sounds great. It was previously used as wire for an ARC welder which used huge amounts of current when actually welding-- just helped to break it in I think;>) Personally, I think as long as end points/contacts are kept clean, copper will last a LONG time. Cheers. Craig
