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QED

QED celebrates 50 years with special edition Golden Anniversary XT speaker cable featuring X-Tube™ Plus technology

British audio specialist QED celebrates its 50th anniversary in style, with the introduction of its Golden Anniversary XT speaker cable. Representing the culmination of five decades of dedicated and extensive research, engineering and audio expertise, Golden Anniversary XT speaker cable is the ideal upgrade for any hi-fi enthusiast who wants to experience the sonic benefits of a high-end speaker cable – but at a real-world price.

Key features at a glance

  • NEW X-Tube™ Plus technology combines X-Tube™ with Aircore™ to deliver an even, consistent performance across the entire audible frequency range.
  • Ultra-pure Ohno Continuous Cast Copper and 99.999% oxygen-free copper conductor blend helps improve the signal path and signal retention.
  • Low Loss Ultra-Uniform Dielectric insulation boosts efficiency and reduces signal loss.
  • Airloc™ Forte banana plugs use a cold weld system for permanent attachment to the cable for improved contact area and reduced resistance.

50 years of innovation

QED has been designing and engineering class-leading and award-winning analogue and digital cables for five decades – and the Golden Anniversary XT is the latest demonstration of the company’s expertise.

Quality Electronic Design (QED) was formed in 1973 by forward-thinking hi-fi enthusiasts, Bob Abraham and Ian Vine. The company is now considered the original cable brand, having released QED 79 Strand, widely recognised as the world’s first “specialist” loudspeaker cable. This product demonstrated how cables could have a tangible impact on audio performance.

QED’s Genesis Report on loudspeaker cable design followed. This research established scientifically proven principles, which are as valid today as they were 28 years ago and informs all QED cable designs, including the pioneering X-Tube™ technology that enables precise and consistent signal delivery across the entire frequency range.

X-Tube™ Plus technology

QED’s innovative and proven X-Tube™ technology places a cable’s conductive material around a central hollow insulating rod – and the result is the elimination of the ‘skin effect’ that would otherwise force high-frequency analogue music signals to the outside of the conductor. And by combining X-Tube™ technology with its equally effective Aircore™ technology, QED also reduces the ‘proximity effect’ that can disrupt current distribution in a speaker cable. The result is X-Tube™ Plus: a ground-breaking cable geometry that ensures Golden Anniversary XT is a speaker cable with even, consistent performance across the entire audible frequency range. 

Ultra-Pure Ohno Continuous Cast Copper conductors

Golden Anniversary XT uses a unique hybrid blend of 99.999% oxygen-free copper (‘OFC’) and Ultra-Pure Ohno Continuous Cast Copper (‘UP-OCC’) to give the improved signal path and outstanding signal retention of ultra-pure copper conductors – but at a fraction of the price. Thanks to class-leading research and engineering, QED Golden Anniversary XT is the most affordable and attainable speaker cable to exploit the advantages of the continuous-casting process, with this hybrid theoretically improving the path for transients and high frequency detail not available using just OFC alone.

Low-Loss Ultra-Uniform Dielectric insulation

If a speaker cable is to perform to its maximum potential, it’s important that the dielectric material which insulates and protects the central conductors of the cable does so efficiently. Golden Anniversary XT uses a specially developed and formulated low-density polyethylene (‘LDPE’), which works in unison with the cable’s X-Tube Plus configuration to deliver a speaker cable that has high-efficiency and a dissipation factor that is barely measurable. 

Airloc™ Forté banana plugs

Airloc™ is a specially developed cold-weld system for permanently attaching QED Forté banana plugs to the company’s entire range of speaker cables, Golden Anniversary XT included. The most vulnerable area of the speaker cable chain is the physical interface between the cable and the speaker or amplifier to which it’s connected – without effective termination, oxidation can occur, degrading the cable’s performance. By using a cold weld crimp-type termination, Forté banana plugs offer maximum resistance to oxidation – for the lifetime of the cable – by effectively turning the cable and the plug into a single, unified object.

QED Golden Anniversary XT is available now from QED retailers priced: £27 / €35 / $40 per metre.

And in pre-terminated options (available November 2023):

QED Golden Anniversary XT 2M: £219.95 / $329.00 / €289.00

QED Golden Anniversary XT 2.5M: £249.95 / $379.00 / €319.00

QED Golden Anniversary XT 3M: £279.95 / $429.00 / €349.00

QED Golden Anniversary XT 5M: £399.95 / $599.00 / €499.00

Learn more at www.qed.co.uk (UK) www.qedcable.com (US)

Download QED Golden Anniversary XT White Paper

Download QED 2023 Brochure

Technical specification

Cross-sectional area: 2.5 mm2

Wire gauge: 14 AWG

Jacket outside diameter: 11.5 mm

Loop inductance: 0.58 μH/m

Loop resistance: 14.8 mΩ/m

Capacitance: 42.0 pF/m

Dissipation factor @ 10 kHz: 0.009

Conductors: 9 x 19/0.13 mm OFC + 1 x 19/0.13 UP OPCC

Insulation: LDPE jacket with 100% coverage of golden/mylar tape wrap

Plugs and spades: QED Airloc™ Forte banana plugs

To find out more about the QED Golden Anniversary XT loudspeaker cable and discover other QED products please visit www.qed.co.uk (UK) and www.qedcable.com (US)

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QED

QED unveils Reference Audio 40 interconnect with second generation Analoc™ plug technology

British audio specialists QED introduces the latest version of its award-winning Reference Audio 40 interconnect, featuring second generation Analoc™ plug technology. Representing yet another stride forward in analogue interconnect design from the original specialist cable company, this model builds on the success of the first generation Analoc™ low eddy current design by entirely removing all conductive material from the plug bodies for superior transparency, timing and audio signal integrity. The Reference Audio 40 remains the ultimate upgrade from budget interconnects for a cleaner, more detailed and dynamic sonic performance.

QED has been designing and engineering superior analogue and digital cables for more than 45 years, and its new Reference Audio 40 cable is informed by the results of the company’s exhaustive research into cable design since 1995.

All-new Analoc2™ design

The Analoc2™ design still features low bulk, high purity copper connectors alongside low mass metal barrels, but now cleverly substitutes high rigidity thermoplastic material for both the inner support structure and the cable strain relief to eliminate the detrimental effects of eddy currents. Although already smaller than in traditional bulk brass plugs, these unfavourable currents were still able to circulate weakly in the isolated metal body of the previous plug design. Now with the new material in place, these remnant resonant distortions are completely prevented from adversely affecting the information contained in the audio signal as it travels through the new plug.

To complete the RCA plug’s Analoc2™ upgrade and to help combat the skin effect, the hollow, gold (or rhodium) plated, high-purity copper signal-pins are retained, while the effectiveness of the slip ring which locks in place the similarly plated, pure copper ground-terminal as the barrels are tightened, has also been improved.

Complementary Conductor Technology

This technology improves timing and detail, retaining the rhythm of the original piece. Unlike conventional analogue interconnects, Reference Audio 40 utilises two Silver-plated 99.999% Oxygen Free Copper conductors of different diameters to carry the same audio signal. This has the effect of providing an alternative path for high frequency audio components which might otherwise become time smeared in a single audio pathway.

Ferrite cord insulation

A Zn/Mn Ferrite jacket is used within the cordage to absorb very high frequency noise components outside of the audible band that have an adverse effect on the micro-timing of the audio signal. When measured at very high frequencies, Reference Audio 40 cables exhibit cleaner signal transmission than standard audio interconnects. Further protection for the Silver Plated 99.999% Oxygen Free Copper (SPOFC) conductors comes in the form of a low loss, low density, dielectric foam Polyethylene (LDPE) inner jacket that minimises electrical energy loss in the cable insulation which can have a detrimental effect on the fidelity of the sound compared with cheaper PVC alternatives.

The QED Reference Audio 40 interconnect is available now in the UK/Europe and in the US from December, priced:

  • £99.95/€125/$139.95 (0.6m length)
  • £119.95/€149/$169.95 (1m length)
  • £149.95/€189/$209.95 (3m length)

To buy the QED Reference Audio 40 and discover other QED products please visit www.qed.co.uk (UK) and www.qedcable.com (US)

Technical specification

  • Analoc2™ plug with inner high rigidity thermoplastic material
  • Silver Plated 99.999% Oxygen Free Copper (SPOFC) conductors with LDPE dielectric
  • Asymmetrical twisted pair geometry
  • OFC shield giving 100% electromagnetic screening
  • Zn/Mn ferrite Jacket
  • Gold plated updated QED Analoc2™ RCA plugs
  • Parallel Capacitance: 76 pF/m
  • Inductance: 0.37 μH/m
  • Loop resistance: 0.072 Ω/m
  • Dissipation Factor: 0.0059

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