Exclusive to the Sigma line is another Gabriel micro-distortion squashing invention he calls TAP. TAP stands for “transverse axial polarizer”, a patent-pending innovation implemented as a clear elongated glass bulb holding a series of discs, with the cable running through the middle. I’ve seen active circuitry boxes on cables, but I’d never seen anything like this. https://positive-feedback.com/reviews/hardware-reviews/shunyata-research-sigma-phono-cable/ for review.
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