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Originally Posted by Uncle Erik 
But can you trust your own perceptions?
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I think, yes. That doesn't mean I have never fallen victim to placebo effects. But I don't believe in consistent delusion.
I can swap my cables anytime and do so occasionally, and the results are always 100% identical («as if the effect was real!»), meaning cable X and cable Y show exactly the same characteristic as always. Or I switch between my two best DACs: they always show the same characteristic differences on a comparable sonic level. My Corda Symphony even allows for different filter characteristics. And although my two favored filters have the same frequency response, they sound different and show the difference consistently. Despite the fact that technically speaking the only difference is in the characteristic of the filter ringing, which is in the ultrasonic range and therefore shouldn't matter.
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| Here are some optical illusions. They all prey on weaknesses in human perception, biases and expectations. |
I like these optical illusions, but I can't see how they correspond to acoustic illusions.
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| You also have weaknesses, biases and expectations from what you hear, feel, smell, and taste. |
Yes, human senses are not 100% reliable, but they are still the best tool for judging what matters to them.
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| We're not that good at seeing the world clearly. We have to design tests and build machines to bypass our biases, expectations and limits of perception. That might seem counterintuitive, but there's no other way to know for sure. |
Some people have a better opinion of human capabilities than you, and I belong to them. If you have the means to control your biases -- by a critical attitude and simply by repeating the comparison on and on -- and get consistent results, then you have every right to be «sure».
I guess you wouldn't mind judging amps (since you make them yourself) or headphones without the detour via DBT. So everybody has a different threshold for relying on his own senses. If the sonic effects of cables were barely noticeable, I wouldn't bother myself -- which means I would also renounce DBT, as they're not worth it.
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