If the receiving device does not use the power then it will not be sucking power via the cable. Just like your household outlets are wired to provide power.. if they are not in use then they just do not have power flowing through them. So no need for a special cable.
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.