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QED Ruby Evolution Speaker Cable (5m)

QED Ruby Evolution Speaker Cable (5m)

The What Hi-Fi? Five Star award winning Ruby Anniversary Evolution cable is a completely new speaker cable from QED laboratories in celebration of FORTY years at the forefront of UK speaker cable design.

EAN: 5036694011416

Man. Part No.: QE1315

QED Ruby Anniversary Speaker Cable
(5 Metre Length)




Ruby Anniversary Evolution, Forty years of experience across the spectrum.

The What Hi-Fi? Five Star award winning Ruby Anniversary Evolution cable is a completely new speaker cable from QED laboratories in celebration of FORTY years at the forefront of UK speaker cable design. It utilizes QED “Aircore Technology™” in a new miniature format to bring high end cable philosophies to the budget hi-fi market. It builds on the success of the XT Evolution and Ruby Anniversary cables with which it shares a family heritage but now incorporates increased conductor spacing to further reduce losses and distortions caused by cable capacitance.


Aircore Technology™

QED cables above 2.5mm2 cross sectional area utilize air core technology to obviate the skin effect by bundling several separately insulated smaller cores together to make up a larger CSA. If these conductors are arranged around a hollow central core of polyethylene the self inductance exhibited by the cable can be reduced to around half that predicted by calculation.


Complementary Conductor Geometry

Utilizes conductors of different diameters to carry the same audio signal. This provides an alternative path for high frequency audio components which might otherwise become time smeared in a single audio pathway.


Recommend for use with QED AirlocTM Plugs

QED developed AIRLOC a solder-free, airtight perfect fusion between the two metals of cable and plug. This ‘cold weld’ method allows the cable and plug to offer the optimum signal transfer and therefore, better sound quality. It also reduces contact resistance and ensures perfect long-term performance.



- Low density polyethylene dielectric
- Five 99.999% Oxygen Free Copper conductors
- 5 low density polyethylene filler rods OD 1.02mm
- AirCore™ Technology
- Jacket OD - 6.00mm
- Cross Sectional Area 3 mm2
Loop resistance 0.011 Ω/m
- Dissipation Factor@10 kHz: 0.0001
Nominal outside diameter 6.0 mm



  • QED Ruby Anniversary Speaker Cable
  • Length: Per Metre
  • Five 99.999% Oxygen Free Copper central conductors of 37/0.146mm stranding (giving a CSA of 3mm2) individually insulated from each other by 5 low density polyethylene filler rods OD 1.02mm
  • These conductors and insulating rods wound around a hollow PE central core of 2.32mm OD using a 90mm opposing lay and held firmly in place by a 100% clear Mylar wrap
  • Ruby Anniversary is sheathed in a flexible clear polyethylene outer jacket
  • Capacitance 34.4pF/m. Loop Inductance 0.50uH/m. Loop resistance 11.0m
  • Dissipation Factor @ 10kHz: 0.0001
  • Nominal outside diameter 6.0mm
  • Lifetime Warranty.


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 our Genesis Silver Spiral loudspeaker cables. However, this results in a product that has a very high quality sound performance, but is expensive to manufacture and can be difficult to terminate.

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. This unique tubular conductor geometry also provides lower flux density within the conductors, which gives improved transparency to the sound.


1.) At low frequencies both X-TUBE™ and conventional stranded/solid core speaker cable convey signals in a linear way. This is represented by the uniform green colour of the strands shown in the two diagrams above.

2.) At higher frequencies X-TUBE retains a near-linear signal transfer, whereas the conventional stranded/solid core cable fails to efficiently conduct higher frequencies uniformly across the entire conductor area. The diagram shows excess current density at the periphery (designated in red) and rapidly deteriorating current density (green through to white) towards the centre of the conductor.

The effect of this is to reduce the actual cross-sectional area of the cable at 15kHz to less than 75% of that at low frequencies. The result is induced distortion and a compromise in the performance of the cable.

X-TUBE with Aircore™ technology exhibits much lower self-inductance and is therefore less affected by this problem. The use of an innovative Polyethylene aircore enables a reduction in loop inductance to levels only usually achievable by using more costly and difficult to terminate cables.

Additional Information

Promotion No
Manufacturer's Part No. QE1315
EAN 5036694011416
Length N/A
Amplifier Award 5 Star
Connections No
Audio Interconnect No
Profile Normal
Video Features No
Features No
Bi Wire No

Finance options* to help you afford the product you want!

If your order value is £389.00 or over you will be given the option to buy on finance when you reach the checkout. We have two finance options available:

Buy Now Pay 6 Months Later
Buy Now Pay 12 Months Later


Please Note: A minimum 10% deposit is payable up front on credit or debit card on all finance orders.

How to Apply

Applying for finance is simple. All you need to do is call us on 0800 634 4484 during opening hours and we will be able to process your order.

Who is the finance agreement with?

The finance agreement is with Hitachi Consumer Credit, one of the largest money lenders in the UK.

*Finance is available to UK applicants 18 years of age or older and subject to status. Finance is not available for business customers. Prices are correct at time of going to press and are subject to change during the term of this offer without notice. Terms and conditions are available on request. Finance agreements are available on orders between  £389 and £10,000 (including VAT and shipping). Please ensure you are able to keep up repayments of any finance package taken.

Now Group UK Ltd trading as Exceptional AV operates under a Consumer Credit Licence, No. 560813.
This licence is issued by The Director General of Fair Trading at the Office of Fair Trading in accordance with the Consumer Credit Act 1974.

QED Ruby Evolution Speaker Cable (5m)

Availability: Usually dispatched

£32.50 inc vat


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