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QED Ruby Anniversary Evolution Pre-Terminated Speaker Cable is a What Hi-Fi? Five Star award-winning cable celebrating 40 years of UK speaker cable innovation. Featuring advanced Aircore Technology™, it delivers high-end audio performance in a compact design, ideal for budget hi-fi systems. Aircore Technology™ QED cables above 2.5mm² cross-sectional area use Aircore Technology™ to counteract the skin effect by bundling several insulated smaller cores around a hollow polyethylene core. This reduces self-inductance by approximately half compared to traditional cables, ensuring consistent resistance across the audio frequency range and superior sound quality. Airloc™ Plug Compatibility Designed for use with QED’s AIRLOC™ solder-free, airtight connectors, this cable ensures optimal signal transfer through a ‘cold weld’ fusion between cable and plug metals. This reduces contact resistance and guarantees long-term, reliable performance. Complementary Conductor Geometry The cable uses conductors of different diameters to carry the same audio signal, providing an alternative path for high-frequency components and reducing time smearing for clearer sound reproduction. Performance Benefits The unique geometry and Aircore Technology™ push the onset of the skin effect beyond the audible spectrum, maintaining low resistance and minimal distortion. Increased conductor spacing reduces capacitance without adding inductance, resulting in a low dissipation factor of 0.0001 — the lowest QED has achieved for a speaker cable. Key Features Aircore Technology™ reduces skin effect and self-inductance Compatible with QED AIRLOC™ solder-free connectors for optimal signal transfer Complementary conductor geometry improves high-frequency response Low capacitance and dissipation factor for minimal signal loss 3mm² cross-sectional area with 13 AWG conductors Low density polyethylene dielectric for durability and performance Specifications Low density polyethylene dielectric Five 99.999% Oxygen Free Copper conductors Five low density polyethylene filler rods (OD 1.02mm) Aircore™ Technology Jacket outer diameter: 6.00mm Cross-sectional area: 3 mm² Capacitance: 33.4 pF/m Loop inductance: 0.61 µH/m Loop resistance: 0.011 Ω/m Dissipation factor @10 kHz: 0.0001 Wire gauge: 13 AWG