A Supra concept for cleaner sound. The tin is of higher resistance than copper and also protects copper from bad sounding corrosion. It also mini-mises the current jumps from wire to wire over corroded copper sur-faces while more of the signal passes through the pure copper inside the wires. The tin layer also minimises the skin-effect, by acting as a semi-Litz.
Only when the frequen-cies are very high, as in digital signals, does it seem wise to go the opposite way, i.e. to silver plate for a lower surface resistance. At such high frequencies it is hard to keep the signal inside the wire, so instead we design for an easier surface current flow.
Important properties of digital cables are a high propagation velocity factor and a correct and stable characteristic impedance (Z).
Low capacitance (C) is important.
Microphone- and line cables
Low microphonic effect, and low capacitance assist quality.
Loudspeaker cables generally need to be of low inductance (L) and preferably also of low resistance (R).
For those who prefer to make their own cable sets and for carrying out servicing, we have gathered the following configuration tables. Please be aware of the importance of the soldering quality. All SUPRA pre-made cables are soldered with lead-free silver-tin with copper solder and non-corrosive flux, available as Almit SR-34 Super, which we recommend.
The galvanic potential of silver is closer to copper than is lead to copper and thus the galvanic potential will be minimised.
Poor solderings is mostly due to either too high or too low a temperature.
Flux is needed to get through the oxide and avoid a dry joint, without overheating.
A dry joint might work very well for a period of time but as the oxide grows between the tin and the object, there will eventually be a poor connection. In the worst case, the conductors will loosen and create a short circuit.
All SUPRA connectors are insulated with Teflon to withstand the correct soldering temperatures (300°- 400°C).
For these reasons we always recommend leaving the soldering of interlinks to a professional workshop.
All of our soldering team are holders of soldering certification to Military Quality Standards.
A/V Cable Measurements
These measurements show that the quality of the Supra Cables is on level with a MIL-spec cable and even outperforms it on velocity.
SUPRA Cables First in World to Prove Directionality in Audio Cables
Supra Cables have taken part in pioneering measurements developed and conducted in a joint venture by Ben Duncan Research and Jenving Technology.
Directionality in audio cables has been controversial, particularly as no other cable maker in the world has previously been able to say what the mechanism is, let alone measure it.
Using regular lab equipment and test signals, the measurements show measurable, and repeatable quite large differences, when cables are reversed. The bottom line is the direction in which the wires inside were last 'drawn' at the copper factory. The tests even revealed conductors that had been reverse-spooled by the copper wire maker!
A proof of the forward thinking in Jenving's Supra Cables, the new test has been able to show that the conductors in all Supra production are not only already optimally 'directed', but that optimal directionality is also already correctly identified.