I am upgrading my sound system from 5.1 to 7.1 and in doing this, I will be adding speakers and rearranging then. The additional pair I will be getting will be from a friend; these speakers have wire coming out of them, but no wire input wire" clamps," so to speak. So, to connect to these speakers to my receiver, I would have to use the wire already installed in them. The trouble I run into is that the wires are not long enough for how I want to place them. My question is, can these wires be extended by "twisting," new wire on the existing wire? Is soldering a must, or can I get away with only electrical tape (I have zero soldering skills or know-how)? And would it be okay if the existing wire and the wire I use to extend it are different gauges? Any help will be appreciated!