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The largest tradeoff between performance and ease of soldering is with digital mic cables, such as 1800F or 2221. The insulation on the two wires is foamed polyethylene. Heating that up even slightly allows the bubbles of nitrogen in the foam to pop, and the insulation will disappear before your eyes. But the performance is fantastic. The capacitance of these cables is a very low 13 pF/foot or 43 pF/meter. That is about the lowest you can go. So how do you go about soldering the un-solderable?