EU Registered Design No. 002544171

UK patent pending GB1602578.5

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REDpurl™ adaptive asymmetric geometry


Combining different gauges of wire to accurately reproduce dynamics and tonal balance using conventional manufacturing techniques we found imposed an unnatural character on the music, robbing it of its lifelike transparency. Symmetrical geometries in cable construction we concluded were a significant cause because of the repeating patterns of interference between fixed, closely bonded wires. 

Our asymmetric REDpurl adaptive asymmetric geometry overcomes this by allowing variations in wire spacing and alignment creating more space between conductors.

Intersect not parallel

Conductors in our cables intersect at increased angles rather than lying parallel with each other so reducing interference.

Low capacitance

The result is a low capacitance cable with good mechanical flexibility without the need for fillers or sheaths.

Phase differences

REDpurl™ provides a geometry that provides for smaller diameter conducting filaments to have a longer length per unit distance than the larger diameter wires so addressing possible phase differences.

Harmonic modes

The organic appearance of the REDpurl™geometry is a reflection of the asymmetry that prevents identical relationships between conductors becoming established. R-C-L relations at individual cable loops vary helping to break up harmonic modes across the music spectrum that can affect dynamic control in an audio system.


Conductor orientation shapes a cable's character and our new adaptive geometry allows us to use this to our advantage. Individual wire loops can be altered at will so tuning the cable's musical presentation.


We prefer the sound of multiple strands of silver-plated copper conductors because they convey the timbre of instruments and voice more realistically than single conductors.

Silver-plated copper

 Silver-plated copper is criticised by some for bringing a thin, bright sound to music but our experience is that this is entirely down to the design of the cables using it. When silver-plated copper is used correctly, it produces a sense of delicate clarity that is unmatched by any form of pure copper or pure silver that we have tried.

Conductor diameter

An audio cable capable of delivering a full range of dynamics and weight across the frequency spectrum requires the use of carefully chosen wires of different diameters. For example, smaller gauge wires can deliver excellent detail and dynamics in the upper frequency range, but when it comes to bass delivery they lack a little weight so shifting the tonal balance. 


PTFE is a very stable, high-performing insulator with a low dielectric constant. It provides excellent mechanical properties and a consistent level of detail and clarity above other dielectrics that we have tested.

Shielding and directionality

We don’t use shielding, preferring to rely on our REDpurl™ geometry to keep RFI at bay; this also means that our cables are not directional in the non-tuned configuration. Once spacers are inserted to tune the cable then it does become directional.

There is undoubtedly an alteration in sound with shielding, often a ‘darkening’ of the background, which can be attractive. But we have carried out extensive tests on cable shielding and have observed that is not without its own problems; whether floating or grounded it always adds a slight artificiality to the sound, as though something of the natural exuberance of instruments has been removed. 


Our RCA interconnects can now be terminated using WBT-0114 phono plug with clamping sleeve or the push-on KLE copper harmony termination.


The essential character of an audio cable is apparent as soon as it is plugged in; it will not develop a better bass response during an extended burn-in, for example. However, there is no doubt that a cable sounds more balanced musically for a burn-in over the course of a week. It is, therefore, best to listen to the cable during this period to appreciate what it delivers before ‘tuning’ it, but there is no reason to extend a burn-in period each time the wire positions are varied.


Designed and made in Britain