QED Reference XT40i Speaker Cable


QED Reference XT40i Speaker Cable UNTERMINATED – Price per metre

Please choose length of cable, for example, order quantity 2 for 2m length, 3 for 3m length and so on.


QED Reference XT40i Speaker Cable

QED Reference XT40i Speaker Cable builds on the formidable reputation of the XT40 cable it replaces and offers a significant step up in sonic performance and sound quality.

QED XT40i pure copper speaker cable uses an evolution of QED’s established X-Tube technology to guarantee superb timing and stereo imaging, bringing superb rhythmic accuracy and musicality to a cable of this modest price. Very low DC resistance adds unrivalled frequency response to XT40i’s already potent audio capability. The result is a cable that advances on the class-leading standards set by its predecessor.

QED X-Tube TechnologyQED Oxygen-Free CopperQED Low-Loss Dielectric





Air Gap Dielectric

QED have added a brand new and highly innovative low-loss Air Gap dielectric to the cable by increasing the separation of its conductors and therefore the amount of air between them. This technology halves the dissipation and capacitance characteristics of the cable, resulting in numerous audible improvements – particularly where timing and rhythmic accuracy are concerned. Despite this increased separation, XT40i retains the sort of cross-sectional area that makes it ideal for long cable runs.

Large Cross-Sectional Area

The cable’s 4mm2 cross sectional area means XT40i exhibits very low resistance, allowing amplifiers to exert outstanding control over the speakers they are driving.

X-Tube™ Technology

At low frequencies both X-Tube™ and conventional stranded/solid core speaker cables convey signals in a linear way. However, at high frequencies, X-Tube™ retains a near-linear signal transfer, whereas the conventional cables fail to conduct uniformly across the entire conductor area.

In standard speaker cables at high frequencies, current flow is highest at the periphery with rapidly deteriorating current density towards the centre of the conductor. This results in higher distortion and compromises the cable’s performance.

X-Tube™ with polycore technology exhibits much lower self-inductance and is therefore less affected by this problem. The polycore technology reduces loop inductance to levels only achievable using more costly and difficult to terminate cables.

The result is a cable with more high frequency detail, less distortion and greater performance.

QED XT40i diagram



Cross-section of XT40i cable



AIRLOC Optional Termination











AIRLOC Forte plugs with improved pin section can be 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.

Airloc Forte Plugs


QED Reference XT40i Speaker Cable Airloc Forte terminated with Airloc banana plugs and/or Airloc spade terminals – optional.


Please check out the following link for terminated QED XT40i speaker cable (you can choose Airloc termination: Airloc Forte ABS plugs and/or spades, Airloc Forte all metal plugs and/or spades).


  • Wire gauge – 12 AWG
  • Precision engineered in figure of 8 configuration
  • X-Tube™ technology
  • Jacket OD – 14mm x 6mm
  • Large cross-sectional area 4.00mm²
  • Loop resistance – 0.008 Ω/m
  • Capacitance – 35pF/m
  • Inductance – 0.57 µH/m
  • Dissipation factor @ 10kHz – 0.0295
  • Ideal for use in all installations

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Additional information

Weight 750 g