QED Speaker Products

QED XT40i

XT40i Pre-Term Speaker Cable

QED used every moment of its five decades of loudspeaker cable expertise to develop XT40i. 

Hear the music you love exactly as it should be. Hear exactly what your loudspeakers are capable of. Hear the sound of science

With new Air Gap Dielectric and X-TubeTM technology


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£107.94

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XT40i PRE-TERM SPEAKER CABLE

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By increasing the separation of the conductors inside the cable, and therefore the amount of air between them, QED has created a low-loss Air Gap dielectric. This technology halves the dissipation and capacitance characteristics of the cable, and results in numerous audible improvements - particularly where timing and rhythmic accuracy are concerned. Despite this increased separation, though, XT40i retains the sort of cross-sectional area that makes it ideal for long cable runs.

X-Tube technology

Forming the cable conductors into a tube-like shape around a hollow insulating rod in the centre of the cable equalises current densities, delivers very low inductance and presents a consistent, even load to an amplifier. 

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When QED’s original XT40 speaker cable was introduced five years ago, it was an immediate and award-winning success. And ever since the day XT40 took home its first award, QED’s engineers have been developing and finessing the formula in an effort to make the best speaker cable in its class even better. 

This relentless drive for improvement has resulted in the ground-breaking and extraordinarily effective new Low Loss Air Gap Dielectric to reduce the cable’s dissipation factor and capacitance by half, delivering astonishing rhythmic accuracy, musicality and enjoyment. 

QED’s mastery of speaker cable technology has enabled them to couple this with low DC resistance and their remarkable X-TubeTM 

technology to reduce distortion and listener fatigue - even over extended listening periods. 

 QED’s utter commitment to engineering excellence, along with its five decades of technological expertise, and its deep understanding of the requirements and expectations of consumers, means XT40i is - both measurably and audibly - the best speaker cable of its type and price ever made. 

Ceaseless attention to detail, brilliantly innovative engineering, and a determination to make the company’s industry-leading technologies available to the widest possible audience means QED has redefined what listeners can expect from an affordable speaker cable.

Painstaking development leads to unrivalled signal integrity and class-leading audio performance. It looks straightforward when written down, but it’s not. It’s what QED does, though - and XT40i is another astonishing example of the art of speaker cable design and manufacture.


  • Outside diameter: 6 x 14 mm 
  • Conductor area: 4 mm² 
  • Dielectric properties: Air Gap (εr = 2.4) 
  • Conductor chemistry: 99.999% oxygen-free copper 
  • Dielectric properties: 
  • Air Gap Loop resistance: 8.0 mΩ/m 
  • Parallel capacitance: 35 pF/m 
  • Dissipation factor @ 10kHz: 0.0295 
  • Self-inductance: 0.57 μH/m Gauge: 12 AWG 
  • Stranded Diameter - 2.75 mm (min) 
  • Suitable for ABS, Metal & Maxi Airloc
SKU Codes :-
  • QE1451 XT40i PRE-TERM SPEAKER CABLE 2m
  • QE1453 XT40i PRE-TERM SPEAKER CABLE 3m
  • QE1455 XT40i PRE-TERM SPEAKER CABLE 5m
  • QE1350 QED XT40i SPEAKER CABLE 50m