I'm setting up the speakers for my new Denon 3805 and have a slight problem. I've put the rear speaker cables under the floorboards, they had already got banana plugs on one end but were bare wire at the other. I know now that I should have marked them There's no way of telling which cable is which (+ve or -ve) at the speaker end when it comes to putting on some plugs. Is it obvious if I've got them the wrong way round when I play something through them ? Can I do any damage connecting them up the wrong way round ?