With a vast array of technologies and our 40+ years in the specialist cable market, we produce cables to suit every budget to maximise the potential of your beloved system. With a vast array of technologies and our 40+ years in the specialist cable market, we produce cables to suit every budget to maximise the potential of your beloved system.
Whether you’re connecting your TV to a sound bar or music server to a DAC, QED has a digital cable to meet your requirements. Our cables are tried and tested to ensure you get the best performance from your digital sources.
When connecting your analogue sources such as your CD player or turntable to your amplifier, here at QED, we have a cable to suit your system. From our entry level Profile cable through to our flagship Signature Interconnect.
Using our unique Tri-Conductor technology and Neutrik XX-14 balanced plugs, our XLR cables offer the cleanest possible sound from a specialist XLR cable, whilst also incorporating our Ferrite insulation to eliminate timing errors.
An alternative to optical, our premium digital coaxial cables use a specially designed cable cordage and unique plug design to achieve the precise signal characteristics required for high resolution and multi-channel audio.
With our high end USB A-B we isolate the power and data conductors preventing any potential cross talk, therefore meaning less jitter and an enhanced audio performance.
For use with Laptops/Computers and portable headphone amps/dacs, the QED reference USB A-Micro B uses our Ferrite insulation to reduce Jitter, as well as isolating the data and power lanes for a cleaner overall signal.
Triple magnet screening and 24K gold plugs makes our Performance USB A-Mini B the best in its class.
Connecting your mobile device/tablet to your audio system has never been easier with our 2 step 3.5mm jack for a simpler connection.
Using our in house HDMI testing facility, QED have designed premium HDMI cables to suit any budget. From our flexible and slimline profile to our exceptional Reference HDMI with its BandPass filter technology to reduce Jitter to Ultra low levels
For all of your Optical needs, QED has an optical cable for you. For the more advanced, high bandwidth signals, Reference Optical Quartz uses glass technology to accurately send the information from source to receiver.
The most common type of cable used for connecting products on a wired network. This cable connects wired devices together to the local network for file sharing and Internet access.
Using technologies from our analogue cables such as complimentary conductor technology, your subwoofer will always perform to its best capability.
The groundbreaking Signature Audio 40 analogue audio interconnect celebrates QED's 40 years at the forefront of British designed audio cables
Signature Audio 40 is an entirely new design concept from QED laboratories. The cordage is designed primarily for low capacitance as this has been identified by QED as a significant factor leading to a high fidelity experience and makes for a tight sound retaining the rhythm of the original piece. Add our Complementary Conductor TechnologyTM for high frequency detail and our Analoc TechnologyTM to maximise signal integrity and the result is what we feel to be the most innovative interconnect ever made by QED. Please see our 'cables matter' section below for more in-depth information on this ground breaking design.
conductors in place of the usual large volume brass body found in ordinary high quality plugs. This cuts down or eliminates the tendency for the changing magnetic field in the conductor to induce eddy currents which can affect the micro timing of the audio signal. Rhodium plating has the advantage for use as a plating material due to its superior hardness.
Silver Plated 99.999% Oxygen Free Copper(SPOFC) conductors with Teflon™ dielectric
Asymmetrical twisted pair geometry
SPOFC shield giving 100% electromagnetic screening
Zn/Mn ferrite Jacket
Rhodium plated QED 'Analoc™' RCA plugs
Cryogenically Treated
Capacitance: 63 pF/m
Inductance: 0.37 μH/m
Loop resistance: 0.072 Ω/m
Dissipation Factor: 0.0011
QED Lifetime Guarantee
There are three cables in the Audio 40 range representing the long established Performance, Reference and Signature designations which have always corresponded to the "good, better, best" principle of QED product hierarchy.* However the whole range has been developed using a strict top down approach which means that all three cables share an almost identical construction and geometry with the Signature cable representing the ideal 'cost no object' original state of the design and the Performance cable its cost engineered alternative. The Reference cable represents the perfect balance of performance against the law of diminishing returns omitting only the most expensive components.
*Performance Audio 40 to be launched 2015.
The cordage is designed primarily for low capacitance as this has been identified by QED as the major factor which leads to a hi-fidelity experience and makes for a tight sound which retains the rhythm of the original piece. Further unique steps have also been taken to eliminate minute timing errors in the cable. Our new complementary conductor geometry is used throughout the range and utilises two conductors of different diameters to carry the same audio signal. This has the effect of providing an alternative path for high frequency audio components which might otherwise become time smeared in a single audio pathway. Another innovation added to the entire range is the specially impregnated PVC jacket containing 10% Zn/Mn ferrite material. This absorbs very high frequency noise signals and audio signal components which are thought to have an adverse affect on the micro-timing of the audio signal. Low dielectric constant materials such as foamed polyethylene or teflon have been used throughout the range to cut down on the amount of audio signal energy lost due to cable capacitance and all of these measures have been applied under the consultation of leading industry experts. We have been able to measure the affects of these improvements using our high frequency cable test suite.
Additionally the new locking plug does nothing to spoil the low jitter, low noise signal provided by the cordage. The new QED Analoc™ plug is a low eddy current design featuring small high purity copper conductors in place of the usual large volume brass body found in ordinary high quality plugs. This cuts down or eliminates the tendency for the changing magnetic field in the conductor to induce eddy currents which can affect the micro-timing of the audio signal. Coupled with its hollow central pin, which is designed to combat the skin effect in the same way as our X-Tube speaker cables, the new QED Analoc ™ plug maintains the fidelity of the audio signal from start to finish.
Traditionally high quality RCA phono plugs (designed in the 1940s and still used today for domestic unbalanced audio connections) have been machined from solid brass. Brass is a reasonably inexpensive material and can be easily worked so it lends itself to use in bespoke designs which attempt to improve
QED's new Analoc™ plugs take advantage of this idea and provide a high purity copper connection without the use of bulky brass plug bodies. The pin section is made from a hollow tube of high purity copper and the ground return is reduced to just two of the normal six leaves. This has the dual effect of providing a low resistance path for the tiny signal currents flowing in line level unbalanced connections and cuts out the possibility of eddy currents forming in the large volume of the plug body which would otherwise form part of the return path for the signal. Eddy currents are swirling circular currents which build up in any conductor where there is a variable magnetic field acting on it such as when an a.c. signal is applied. Eddy currents flowing in a conductor of a given resistivity necessarily dissipate energy and this energy loss is proportional to the square of the diameter of the conductor - so the smaller this can be kept, the less the effect of eddy currents on the delicate audio signal. Add to this that due to self inductance eddy currents can persist for a short time after the field is removed and always create a field that opposes that which creates them, it can be seen that eliminating this phenomenon can lead to improved transmission of the audio signal - especially in the area of minute timing effects.
Eddy currents give rise to the skin effect wherein the current increasingly flows towards the outside of the conductor as frequency increases. By removing the central portion of the copper pin section we have reduced eddy currents here also and thus combated the skin effect and reduced self inductance in a similar way to that employed in our X-Tube™ speaker cables. Because the contact area of the outer ground ring has been reduced it is necessary to provide a very firm connection indeed and so all Analoc™ plugs have a locking feature built in so that as the barrel is screwed up tight, the clamping force is increased making for a super noise free and secure connection for life.
The high purity copper conductors featured in the Analoc range come with gold plating at Reference level and rhodium plating for the Signature plugs. This plating is there to maintain low contact resistance throughout the life of the product due to the stability and low reactivity of these metals. Although copper is the second best electrical conductor (behind silver) it does react with oxygen and can tarnish over time increasing the contact resistance and therefore increasing distortion of the original signal. Rhodium has the advantage for use as a plating material due to its superior hardness. QED Analoc comes as standard on the Audio 40 interconnect range and can be purchased separately to be included in custom cable projects.
QED ‘Analoc RCA plug which features high purity copper signal and ground connections in an insulated low eddy current brass body. The hollow central pin eliminates skin effect in the signal connection and the locking barrel design clamps the dual tombstone ground connection firmly to the RCA sockets
Complementary conductor geometry utilises two conductors of different diameters to carry the same audio signal. This has the effect of providing an alternative path for high frequency audio components which might otherwise become time smeared in a single audio pathway.
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"This kind of transparency is difficult for rivals to match"
REFERENCE XT400, December 2017
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