Aspen uses a carefully finessed combination of high-purity Perfect-Surface Copper (PSC), and extreme high-purity Perfect-Surface Copper+ (PSC+) conductors in a Self-Shielding Double Counter-Spiral HyperLitz design. Solid conductors prevent strand interaction, a major source of distortion. Surface quality is critical because a conductor can be considered as a rail-guide for both the electric fields within a conductor, and for the magnetic fields outside the conductor. The astonishingly smooth and pure Perfect-Surface nearly eliminates harshness and greatly increases clarity compared to OFHC, OCC, 8N and other coppers. The superior purity of PSC+ further minimizes distortion caused by grain boundaries, which exist within any metal conductor.