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Just a note: the vast majority of copper wire manufactured worldwide is "oxygen free" on some level - there are different grades of purity. Some audio suppliers use the term "oxygen free" as a marketing gimmick without ever specifying exactly what grade of copper they're using (and it might be the lowest).
Cheap lamp flex is just as good a conductor at audio frequencies as "audio" cable costing 20x as much. Forget about the gimmicks.
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