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.

A 15-gauge PSC+ full-range speaker cable
When Type 4 was introduced about 1983, it wasn’t the prettiest cable, but the performance advantage of its polypropylene insulation was dramatic and much appreciated. Several evolutionary steps later, the current version of Type 4 was introduced in 1995—a design whose foundation is so well balanced that it hasn’t changed since then—and still isn’t changing.

Types 9 is essentially Type 4 with better metal (and better again than a Type 5), and with added layers and techniques of noise dissipation for more effective noise control than any previous Type X iteration.