Exactly @phd — glad you said that.
For differences reported between two already-adequate cables, where measured differences are genuinely below audibility thresholds, the most likely explanations are perceptual. That doesn't make them imaginary — but it does locate them in the listener rather than the wire:
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Expectation bias: Sighted listening measures the listener's whole brain state — price, brand, expectation — not just the cable. Expectation genuinely changes perception, not merely the report. The person really does hear it differently; the difference just isn't in the air.
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Auditory memory decay: Memory for timbre degrades within seconds. A cable swap takes minutes, which means sighted A/B comparison of small differences is nearly worthless without instantaneous, level-matched switching.
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Level differences masquerading as quality: A 0.2dB level difference sits below the threshold for detecting loudness, but above the threshold for perceiving clarity. Uncontrolled level differences get perceived as qualitative improvements — which is why level-matching to within 0.1dB is non-negotiable in any valid test.
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Pattern completion: Once you believe a cable is warmer, you attend to and remember the warm moments and discount the rest. This is confirmation bias operating at the perceptual level, not just the cognitive one.

