Skip to content
Book a showroom consultation here!
Book a showroom consultation here!

QED Reference Digital Audio 40

by QED
Original price €105.00 - Original price €152.00
Original price €105.00
€105.00
€105.00 - €152.00
Current price €105.00
Length: 0.6M
Available to order (with lead time)
For latest lead times or to put down a deposit please contact us
In a rush? See what's available for immediate dispatch

Reference Digital Audio 40 utilises a carefully engineered geometry to achieve the precise characteristic impedance required for the maximum transfer of S/PDIF signals.

Reference Digital Audio 40, the new standard for digital coaxial S/PDIF signals.

Reference Digital Audio 40 utilises a carefully engineered geometry to achieve the precise characteristic impedance required for the maximum transfer of S/PDIF signals. Silver plated conductors deliver a low resistance path for high frequencies and QED "Digiloc" plugs more closely match the cable's characteristic impedance, reducing return loss by up to 1dB when compared to conventional RCA plugs. This ensures optimal signal transfer and improved micro-timing of the audio signal.

Just Listen

Silver plated signal carriers, effective high quality shielding and impedance matched cordage and plugs all combine to create audible sonic improvements when compared to the competition.

Triple Layer Electromagnetic Shielding

Through the use of factory controlled geometry and low permittivity foamed polyethylene dielectrics, Reference Digital Audio 40 maintains the correct characteristic impedance to match the transmission line between digital source and sink precisely. This makes for a very low jitter signal transfer which, listening tests have shown, leads to clearly audible sonic improvements.

75 Ohm Impedance matched Digiloc RCA plugs

Domestic S/PDIF interfaces use the traditional RCA phono connector which is not impedance matched to the 75 Ohm transmission line. This causes measurable insertion loss and an increase in jitter due to signal reflections at the connector boundaries. The all new Digiloc RCA plugs are more closely impedance matched than ever before and measurements have shown, reduce insertion loss by up to 1.2 dB compared to ordinary RCA plugs.

Triple Layer Electromagnetic Shielding

A dual-layer closely woven 99.999% OFC shield braid and aluminum mylar wrap with 100% coverage comprise a triple layer electromagnetic shield coaxially spaced around the central signal carrier within a foamed polyethylene dielectric. This ensures that interference signals induced by nearby high current noise sources do not contribute to higher signal jitter than would otherwise be the case. By the same token, the shielding prevents unwanted voltage induced interference escaping the cable which might affect nearby analog signal carriers.

Ultra Low Jitter

Jitter is the undesired deviation from true periodicity of an assumed periodic signal in electronics and telecommunications, often in relation to a reference clock source. A cable displaying ultra low jitter has been measured at typically 30ps.

  • Silver Plated 99.999% Oxygen Free Copper central conductor
  • Extruded foamed Polyethylene (PE) dielectric - for sonic purity and low return loss
  • Double 99.999% OFC braid plus Al/Mylar wrap for 100% electromagnetic screening coverage
  • Twin leaf 24c Gold plated QED 'Digiloc™' RCA plugs featuring high purity copper contacts, hollow centre pin and low eddy current design
  • 75 ohm coaxial design with closely matched locking plug for reduced return loss
Visit our showrooms

Visit our showrooms

We know that there's nothing quite like seeing, hearing and feeling what a product is really like. Whether you're investigating a specific product or want to compare within a category, we can help.

Our experts teams will ensure that you have the best advice and products to choose from. Our Dublin Showroom is conveniently located with free parking. All with no obligation to buy.

Book a free personal consultation now

Blog posts

  • What’s the deal with impedance?

    What’s the deal with impedance?

    The first thing you need to know about impedance is that, like many things, it can be a complicated subject. The second thing you need to know is that you really don’t need to understand everything about impedance to actually...

    Read now
  • Headphones

    Headphones

      How Much Do I Need To Spend? Yes, it’s possible to get a fairly decent set of headphones for €50, but as with most things, you get what you pay for. If you want a pair of headphones that...

    Read now
  • How To Care For Your Vinyl

    How To Care For Your Vinyl

    Unlike your Spotify or Apple Music subscription, owning a collection of vinyl means protecting your LP to make sure it sounds its best. True music lovers enjoy listening to their vinyl, not just using them as décor props and taking...

    Read now
Custom Smart Home Installations

Custom Smart Home Installations

Your Home. Simplified

Learn more