EU Registered Design No. 002544171

UK patent pending GB1602578.5

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Advantages of Tunable REDpurl™ adaptive audio cable geometry 


 "REDpurl Adaptive Geometry from the very start was always about combining the highest levels of detail and dynamics with musicality but that it was also able to tune to better match audio components far exceeded our expectations." Chris Bell, Designer. 




 Different gauge conductors provide a full range of dynamics and tonal colour across the music spectrum.

Once braided, our triple gauge construction creates space between conductors resulting in a specific geometry.



There are certain benefits to this arrangement.




You can't have a 'perfect' cable. The physics in a single cable, however well designed, will sound different depending on who is listening to it and the equipment it is plugged into. 

But there will be a 'best' interconnect that matches those requirements and by allowing us to bend the physics in our cables we can more easily achieve this goal.





Spacers alter the geometry of our cables altering their capacitance and tuning their musical presentation.



Tuning is simple and can be explored using only a handful of configurations as shown below but we can also ultra-tune our cables for you in our workshop: More about tuning




Summary of REDpurl™ properties




Intersect not parallel

Conductors intersect at angles, rather than lying parallel with each other so reducing interference or crosstalk.

Low capacitance

The result is more space between conductors creating a low-capacitance cable with good mechanical flexibility, without the need for fillers or sheaths.

Phase differences

REDpurl™ geometry gives smaller-diameter conducting filaments a longer length-per unit-distance than the larger diameter wires. This addresses possible phase differences.

Harmonic modes

The organic asymmetric structure of the REDpurl™ geometry prevents identical relationships between conductors becoming established so inhibiting harmonic modes across the music spectrum and improving dynamic control.

Conductor diameter

We believe in order to deliver a full range of dynamics, weight and tonal colour across the frequency spectrum, an audio cable requires different diameter conductors. However, when combined using conventional techniques, their proximity to each other can effect the natural flow and musicality of the sound. We find the extra space we create between wires sounds a lot better.


HiFi audio cables-choosing the right conductors




For us, multiple strands of silver-plated copper convey the timbre of instruments and voice more realistically than single conductors.

Silver-plated copper

When silver-plated copper is used with the correct cable geometry, it produces a sense of delicate clarity that is unmatched by any form of pure copper or pure silver that we have tried.


 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 have carried out extensive tests on cable shielding. Whether floating or grounded it always adds a slight artificiality to the sound, removing some of the natural exuberance of the instruments. So we don’t use shielding, preferring to rely on our REDpurl™ geometry to keep RFI at bay.  

Our Experience680 RCA interconnects only are directional. 


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


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