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There is no value to gold in any audio application. In fact it often is worse than the alternatives, but now almost unavoidable.
Frequency response for speaker cable isn't an issue for domestic lengths, ever. The dielectric is irrelevant for domestic audio.
Frequency response is only an issue for things like telephone wires or similar long distance links like for analogue outside broadcast feeds. I've had to equalise cables for audio, but they were several kilometres long!
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