Pure 6N silver 4 core USB upgrade cable.
Splendid results and step above lots of USB cables on the market!
If you still assume it's just 0 & 1s and USB doesn't affect the sound, please refer to the article on 6moons.com!
Need at least 150h of breaking in period (YES, that does work with silver!)
Reviews could be found here and here on Head-Fi.
Few good words from one happy customer – PS Audio.
• Carefully handmade braided cable consists of 4 cores of AWG28 (0.33mm ⌀) solid silver 6N purity wire.
• Gold plated USB A & B plugs.
• Gold plated USB A & B pins (solder side as well).
• Separate double shielding via aluminum foil and copper.
• Woven Teflon Litz construction is ideal to deliver RFI and EMI rejection and provides low capacitance.
• 6N silver transmits electrical signals faster and with less distortion than ordinary OFC wires.
• High grade Teflon insulation gives a predominant air dielectric and is regarded as the best insulator for bare cable.