Probably way too anal, but I am wiring for speakers and because it will all be behind the wall I would like to avoid any oxidation of the copper. Any thoughts on compounds to prevent oxidation and keep my sound path pure?
You are concerned about the exposed copper corroding? If that is your concern, why not solder the connections and forget about it. Remember - the part of the wire that is in contact with the connector can't get air to corrode. If you have enough moisture in the wall to cause corrosion, I think you will have more than speaker problems .