I am not sure if I am supposed to post this here on in one of the other forums. I recieved, in my e-mail today, the Soundbytes newletter from Music Direct and they are sell demo Cardas replacement cables for Sennheiser 580's and 600's, 10ft. length for $120. It doesn't state how many sets they have. I thought someone here might find this info useful. I don't have their phone number but I am sure you can get it from their web site.