Audioquest Tower 3.5mm to 3.5mm Jack Cable The new entry point in the series, Tower, employs solid Long-Grain Copper (LGC) conductors, and many features used throughout the Bridges & Falls lineup, including Asymmetrical Double-Balanced Geometry, Foamed-Polyethylene insulation, Metal-Layer Noise-Dissipation System (NDS), and Cold-Welded Gold-Plated RCA plugs. Compared with the next step up the line, Evergreen, Tower uses slightly smaller conductors for cost-effective performance. Solid Long-Grain Copper Conductors (LGC) : Strand interaction is the single greatest cause of distortion in a cable. Semi-Solid Concentric Packed Conductors avoid many strand-interaction distortion mechanisms. Solid-core conductors offer a complete and compelling solution to this problem. Conductor metal quality is critical for the best cable performance. The conductor surface is the only area of the conductor with 100% current density at all frequencies. The smoothness of the conductor surface is imperative because the surface is a guide rail for the entire energy envelope. The best copper and silver conductor metals have fewer grain boundaries and low oxygen content for low distortion and high performance. Solid conductors eliminate strand-interaction distortion. Tower's solid Long-Grain Copper allows a smoother and clearer sound than cables using regular OFHC (Oxygen-Free High-Conductivity) copper. OFHC is a general metal industry specification regarding “loss” without any concern for distortion. LGC has fewer oxides within the conducting material, less impurities, less grain boundaries, and definitively better performance. Foamed-Polyethylene Insulation : Insulation is necessary to keep the positive and negative conductors separate and to give stability to cable geometry. Insulation is also a "dielectric" because it is inside the conductor's magnetic field....