Reference Audio 40
The revolutionary Reference Audio 40 analogue audio interconnect celebrates QED's 40 years at the forefront of British designed audio cables
The Audio 40 cable range is an entirely new design concept from QED labs. The cordage is designed primarily for low capacitance as this has been identified by QED as a significant factor which leads to a high fidelity experience, making for a tight sound and 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.
FEATURES AND BENEFITS
Complementary Conductor TechnologyTM
This innovation 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.
FOAMED POLYETHYLENE DIELECTRIC
Foamed Polyethylene has a low dielectric constant and has been used to cut down on the amount of audio signal energy lost due to cable capacitance.
ANALOCTM Locking RCA Plugs
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.
Silver Plated 99.999% Oxygen Free Copper (SPOFC) conductors with LDPE dielectric
Asymmetrical twisted pair geometry
OFC shield giving 100% electromagnetic screening
Zn/Mn ferrite Jacket
Gold plated QED 'Analoc™' RCA plugs
Parallel Capacitance: 76 pF/m
Inductance: 0.37 μH/m
Loop resistance: 0.072 Ω/m
Dissipation Factor: 0.0059QED Lifetime Guarantee
Like most interconnects here, the Reference Audio 40 is a silver-plated copper affair, arranged in a special complementary way - the two conductors have different diameters, and this is said to give an alternative path for high-frequency audio signals to avoid time smear. The foamed polyethylene dielectric is claimed to reduce the amount of signal lost to cable capacitance. QED's Analoc plugs are fitted, said to be a low eddy current design with copper instead of brass used. They feature an outer locking cylinder that needs to be screwed forward before the plug's 'blades' can be locked onto the RCA phono socket, then the locking cylinder needs to tightened backup for a (very) secure fit. The Signature Revelation speaker cable uses 10 silver-plated oxygen- free copper central conductors, which are claimed to provide very low resistance alongside high levels of detail. These cores are separately insulated and arranged around a hollow core of polyethylene; QED calls this its Aircore technology and it's claimed to reduce inductance.
Before the QED loom, the panellists have taken a mixed view of the various wires played to them. They've found positives and negatives, liked some and been lukewarm about others. But two out of the three listeners express a strong preference for this set of cables, applauding it for its clean, open, even sound that doesn't try to do anything too clever. Instead it is very accomplished at almost every facet of the music, and makes things look rather easy.
"Everything is joined up," says one panellist, and so it proves. The Lorde track plays better than it has through most others here. Although not necessarily the warmest or most expansive, it just seems to gel the bass with the rest of the music - which is something several others fail to do.It doesn't sound too steely in the midband, giving a nice smooth sound to female vocals, and treble is crisp and finessed. Musically the loom works very well, the beat bouncing along in an enjoyable way. The result is a surprisingly easy listen, when previously the track hasn't quite made sense.The REM tune is described as sounding, "head and shoulders better" by one panellist. There is a fine sense of depth to what can sound a pretty close and claustrophobic mix. One can hear lots of detail too, with the keyboard backing track coming through from the second verse, where previously it had been submerged. Tonally the QED isn't the warmest or most sumptuous here, but it is very even and transparent and doesn't seem to be trying to add or subtract anything much. This means that it's likely to work well with a wide range of systems. Moving to the Duke Ellington piece and the pattern continues. One adoring panellist describes it as, "good bass rhythm and control, nice, cohesive, great sound, head and shoulders better".Another of the panellists isn't quite so enamoured; they appear to yearn for the expansive yet sumptuous midband of the Ecosse, and find the QED a little too anodyne and bland when playing Julian Lloyd Webber's cello work. All of which just goes to show how much taste plays a part, but still this remains a superb result considering its low price
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 Technology
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.
Ferrite Insulation Technology
Like putting wooden wheels on a Ferrari, conventional RCA phono plugs have the potential to undo all of the hard work carried out by our carefully designed cordage. With Anamate and Analoc RCA plugs, the fidelity of the audio signal is maintained form start to finish.
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