I've self-made my speaker cables many years ago. I took two wires and turned them against each other. In technical terms today we call it 'twisted-pair'. Each of the two channels is connected to the box via a 10 meters cable. I don't really know if 'twisted-pair' for analog signals makes any sense but digital signals are very happy about this circumstance...

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Greetings from Frankfurt (Germany),
Sheriff ;-)