QED Reference XT40 Speaker Cable Airloc Forte Terminated


QED Reference XT40 Speaker Cable Airloc Forte Terminated is fitted with Airloc connectors for optimum performance and sound quality.

Please choose length of cable, termination and quantity required. For example, order quantity 2 for a pair of cables to connect to a pair of speakers.



QED Reference XT40 Speaker Cable Airloc Forte Terminated

QED Reference XT40 Speaker Cable Airloc Forte Terminated both ends with a total of 4 AIRLOC Forte banana plugs (and/or Airloc spade terminals, on request).

QED XT40 Speaker Cable is a new design: it utilises X-Tube (Aircore™) Technology in a new format to bring high end cable performance.

what hifi 5 starAcclaimed by What HI-FI? Magazine this ‘5 Star’ award winning pure copper loudspeaker cable boasts QED’s advanced X-Tube (Aircore™) technology and a massive 4mm2 cross sectional area. This results in a cable that delivers clear sonic advantages over conventional cable designs by maintaining a flat frequency response within the audio band.

Hi-Fi Choice Recommended


“Everything about the XT40 is clear and engaging….superb performance at the price”

HiFi Choice Extras 2015, Feb 2015

What Hi-Fi XT40


“An exceptional performer and a natural upgrade from a beginner’s cable.”

What Hi-Fi? Awards 2014 – Best Speaker Cable, Oct 2014

QED XT40 Airlocs

AIRLOC Terminated

AIRLOC Forte plugs with improved pin section are fitted to maximise contact area throughout the wide tolerance range found in 4mm amplifier and speaker sockets. This means that the connection remains uniformly tight and with its premium gold-plating, provides optimum sonic performance through time.

QED XT40 Airloc Plugs

QED Reference XT40 Speaker Cable can be fitted with Airloc Forte banana plugs and/or spade terminals.

Aircore™ Technology Explained

One of the big problems as cable conductor size increases, is how to keep the inductance low. This is vital to reduce cable losses and prevent inaccuracies in the signal transfer process, i.e. distortion. 
The normal way to do this is to use a number of individually insulated conductors within the cable construction. This method is utilised to great effect in the design of QED’s Genesis Silver Spiral loudspeaker cables.

X-Tube Diagram

To take advantage of this design ethos, but in a more conventional format, X-TUBE forms the conductor in the shape of a tube with an inner aircore. This has the same effect as using multiple insulated conductors and ensures that high frequencies are transmitted cleanly, with the added benefit of ease of termination. The unique tubular conductor geometry also provides lower flux density within the conductors, which gives improved transparency to the sound.

The overall result is more high frequency detail, less distortion and greater performance.


  • Wire gauge – 12 AWG
  • Precision engineered in figure of 8 configuration
  • X-Tube™ technology
  • Jacket OD – 12.7mm x 6mm
  • Large cross-sectional area 4.00mm²
  • Loop resistance – 0.008 Ω/m
  • Capacitance – 59pF/m
  • Inductance – 0.46 µH/m
  • Dissipation factor – 0.0576
  • Ideal for use in all installations

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Additional information

Weight 750 g