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QED Reference X-Tube 40 Speaker Cable

As QED celebrates 40 years of award winning British heritage it's apt that they have just achieved Winner of ''Best speaker cable'' at this years What Hi-Fi? Awards.

Cable sold per metre - unterminated.


This pure copper loudspeaker cable boasts QED''s advanced X-TubeTM technology and a massive 4mm2 cross sectional area resulting in a cable that delivers clear sonic advantages over conventional cable designs by maintaining a flat frequency response within the audio band.


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 cable fails 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.

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 that X-Tube delivers greater detail and fidelity across the audio spectrum which would other wise be lost in ordinary cables.

LARGE 4mm2 cross sectional area

The 4mm2 cross sectional area means XT40 exhibits very low resistance, allowing amplifiers to exert outstanding control over the speakers they are driving. In addition, its large cross sectional area makes it suitable for long cable runs.

• 1 x 24 x 10/0.146mm 99.999% OFC closely woven braid wound round a hollow LDPE filler rod 2.8mm in diameter with a 100% coverage copper tape wrap in between
• A paper wrap and pearl white finish PVC jacket comprise the cable dielectric.
• Capacitance 59.0 pF/m, Loop Inductance 0.46 H/m, Loop resistance 8.0 mO
• Dissipation Factor @ 10 kHz: 0.0576
• Nominal outside diameter 6.0 mm
• For best results it should be used in conjunction with QED Airloc Forte banana plugs
• Lifetime Guarantee