RIP Gibraltar, long live Castle Rock! Like Gibraltar before it, Castle Rock is designed as an extremely high-performance cable which provides true Double-BiWire performance in a single attractive cable. Original Gibraltar's all important basics - superior geometry, magnetic autonomy of each quad-conductor section, Perfect-Surface metal technology, conductor-size optimization (AQ's Spread-Spectrum Technology), etc. - are the fundamentals of Castle Rock. Castle Rock employs AQ's best copper conductor metal (Perfect-Surface Copper+), AudioQuest's DBS (Dielectric-Bias System) and NDS (Noise-Dissipation System).
A very recent advancement featured in Castle Rock (and all other Tree and Rock Series speaker cables) is the addition of the sleek new "Hanging-Silver" 1000 Series Multi-Spades and Bananas. Originally developed for the WEL Signature Series speaker cables, these plugs are made using a "hanging silver over pure red-copper" process in which the spades and bananas are submerged ("hung") into a vat of extreme-purity silver, resulting in a very thick direct-silver plate. No intermediary performance-degrading materials (such as nickel or alloy) are used.