I have enough background in electrical engineering to be able to say with certainty that there are several absolutely objective criteria that can be used to gauge the overall performance of an audio playback system. Criteria such as distortion and frequency response can be measured and compared with high precision. I can also say with certainty that the build quality of a USB cable in a purely digital signal path has no impact on these objective criteria once the cable meets the minimum standard to ensure that the digital signal is transmitted in the first place. Yet experts who have spent years enhancing their knowledge of audio systems are adamant that they can hear the difference when they use $1000 USB cables: http://www.hifiplus.com/articles/first-listen-audioquest-diamond-usb-cable/?page=2 Frederic Brochet's famous 2001 study showed that expert wine tasters cannot even distinguish between red and white wine in a blind taste test. http://www.realclearscience.com/blog/2014...
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