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Last spring a customer sent us a harness from his old supplier and asked what was wrong with it. The complaint was hum. Not loud hum, but enough that his installed conference room mics picked it up. We cut the boot off one XLR and found the problem in about ten seconds: the shield had been soldered to pin 1 with a three-centimeter pigtail, and the drain wire had been twisted into a neat little antenna sitting right next to the hot pin. That is what this article is about. Audio harnesses are not hard to build badly. They are hard to build so they stay quiet in a rack, on a stage, or inside a powered speaker that gets trucked across a country twice a month. We build custom audio cable assemblies and speaker wire harnesses for pro audio, installed AV, and hi-fi OEM customers out of our factory in Xiamen, and this is everything we have learned about getting it right.