Solid Core Cables
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Overview of DNM Stereo Cables
In 1984 DNM made the first spaced-pair single solid core audio cables which over time became recognised for their unique clarity of sound. They were designed to give improved magnetic performance and good amplifier loading, factors which have been neglected by other cable makers. Low cost and high performance ensured the commercial success of DNM cables for over 23 years.
In 2007 DNM cable research moved on : driven by the demands of our amplifier technology, we announced Stereo Solid Core Precision audio cable using a unique design of ribbon to enhance performance and ease of use.
Now in 2013 we have progressed again to two new even higher performance speaker cables, a replacement for Precision called DNM Precision 2 and a replacement for the heavier DNM stereo speaker cable called DNM Resolution.
DNM Stereo Solid Core cable is designed to enable any amplifier driving the cable to work optimally into the cable load. Ultra high frequency interactions between the amplifier and cable play a major part in determining the sound quality of the combination, but observed differences in sound are normally attributed to the cable alone.
The design of the insulated casing (the ribbon) plays an important part in the sound quality of DNM Stereo cables for reasons shown in this link How DNM Stereo Solid Core cable works.
One key aim of the new DNM Stereo cable design was to make the preparation and termination of the cable much easier, so that customers could choose to fit the connectors themselves and save money. Our DNM online shop sells cables and connectors and also offers a construction service for customers who prefer to purchase complete ready-to-use cables.
This link gives detailed information with illustrations about Preparation/Assembly of DNM stereo cables and Directionality.
Since 2008 the DNM range of stereo solid core cables has been extended to three types, two stereo/bi-wire speaker cables and one stereo interconnect cable, offering an ideal cable for most applications with the clearest sound regardless of price.
How DNM Stereo Solid Core cable works
DNM uses scientific principles to set the basic cable parameters, defining the magnetic and ultra-high frequency characteristics, both factors that really do affect the audio performance of a cable.
Less certain aspects of cable design, such as conductor shape and propagation velocity of the insulation material, add to the mystique of hi-fi cable design and increase the price but not the performance.
DNM Design considers the interface between amplifier and cable to be vital for best sound quality. We therefore concentrate on getting the basics right and our tests have confirmed that complex cables with speculative design features, even though they cost much more, usually lack in sound quality compared with DNM cables.
The main features of DNM audio cables are described below. Three domestic DNM cables are now available at a modest price but they all give very high performance.
DNM Solid Core conductors
DNM uses single solid-core (round-section high purity copper) conductors to ensure that magnetically generated back-EMF is truly proportional to the signal. This contrasts with the untidy magnetically-generated eddy currents that interfere with the audio signal in the conductors of heavy multi-stranded cables and cables using flat section conductors.
The three DNM Stereo cables use different conductor diameters to suit the application :
1.30mm for normal speaker application (Resolution)
0.85mm for high sensitivity speaker application (Precision 2)
0.4mm for interconnect application.
The insulation and cable construction
DNM stereo solid core audio cables use LDPE (low density polyethylene) insulation in a unique ribbon that is designed to improve the audio performance.
The DNM stereo ribbon is dimensioned for the application and it contains four conductors that carry two channels for stereo or one bi-wire channel. The ribbon is a key element because it controls the all-important spacing between the conductors defining the RCL balance (resistance, capacitance and inductance) which determines the ultra-high frequency loading - a factor that definitely affects the sound quality of the driving amplifier.
The DNM conductors are encased in a semi-transparent outer ribbon. The ribbon has an offset between its own plane and the plane of the conductors, as shown above. This causes air to be the primary dielectric, reducing the capacitance between the conductors and increasing linearity. Carefully selected spacing between the conductors minimises the high frequency reflections that can reduce the performance of the amplifier.
An easy-separation feature is designed into the ribbon which has the added advantage of reducing its tendency to resonate when the speaker current causes the conductors to be magnetically pulled together (reducing the Q of the structure).
The combined effect of all the advanced features in DNM Stereo Solid Core cables offer a new level of sound clarity at a modest price.
The three versions of DNM stereo cable are illustrated in detail here to compare their cross-section size, the drawing also shows dimensions and full technical information.
Full cable preparation and assembly instructions here - extremely thorough, with helpful photos.
Original Mono Solid Core Cable
Since the early 1980's, there has been an increasing demand for high-quality interconnect and speaker cables. What began as a quest by music lovers to get that little bit more out of their hi-fi systems has grown into a multi-million pound business, full of marketing hyperbole, exotic packaging and enough expensive metal to build a ship!
Unfortunately, many of these over-engineered cables owe more to increasing the perceived value of the product than to improving sound quality. Ribbon-type solid core cable was originally developed by DNM back in 1984 and now has many converts. It represents the opposite approach to most of the audiophile cable market, but it is designed for domestic audio - and for that application we believe it is the best at any price.
The majority of cables used in audio have been selected for their low inductance, low resistance and high capacitance characteristics as measured on the test bench. These parameters define what are believed to be the electrical properties most ideal in an audio cable.
Applications, however, vary widely, from recording studios through public address systems and live concert amplification to the domestic, with each having its own particular demands. No multi-purpose cable can suit the precise requirements of the domestic music lover as well as one designed specifically for that purpose - as home listening tests prove!
There are good technical reasons for this.
Once the cross-sectional area of a cable exceeds a certain size, things begin to go badly wrong with the sound. Complex interactions between the cable and the magnetic fields generated by transmission of an electrical signal cause circulating eddy currents, which also generate significant magnetic fields.
These induced magnetic fields oppose the original signal - the result is distortion. In short - smaller
When auditioning speaker cable, most of the differences heard are caused not by the cable itself but by the amplifier reacting to the revised loading of the cable. Large, multi-strand cables are recommended by some manufacturers because their low resistance is thought to maintain the amplifier's low output impedance. Whilst this is true, it has no sonic benefit at all because amplifiers sound better when driving through a resistive or inductive load.
Large diameter high-capacitance cables connect the amplifier's sensitive feedback control system to a short circuit, a type of load that invariably worsens the amplifiers sound quality.
Smaller diameter cables with higher resistance and inductance help to isolate the amplifier's feedback control system, improving clarity throughout the frequency range.
This argument for the speaker cables applies equally well for each element in the audio chain, other cables and even electronics. So the interconnect cable is equally important and amplifier design is influenced by these considerations as well.
The final proof is in the auditioning. Although our cables are inexpensive by high-end audio standards, we believe that they prove their worth, no matter how complex and expensive the competition!
A question often raised by customers concerns the use of plastic bodied RCA plugs on our interconnect cables. Compared with competitors, these plugs look rather inexpensive but they assist the performance of DNM reson interconnect cables. Using a cable so carefully designed to minimise magnetic effects with a large chunk of metal soldered on the end would be self-defeating.
Consequently, all our connectors have minimal metal content because metal is needed only for the signal path and the contact area.
This DNM philosophy is consistent throughout the product range. Its formulation is a result of careful research into the effect of dynamic magnetic fields on audio signals. Understanding field effects should no longer be a quantum leap in audio thinking - especially for a technology led industry!
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