EU Registered Design No. 002544171

UK patent pending GB1602578.5

Refineable Excellence

Powered by


Spacers inserted into one of our cables alters its geometry and capacitance so tuning its musical presentation allowing a series of high quality interconnects to be unlocked from a single audio cable to suit different tastes and systems.

Our audio cables are constructed using our unique REDpurlgeometry, a sophisticated piece of hifi design, that can significantly enlarge your listening experience under three major headings: Directional presentation (680 only), Sound staging, and Fine tuning.

Click on diagram below for further information.

 REDpurl™ adaptive asymmetric geometry

Conventional construction methods with their symmetrical geometries impose an unnatural character on music reproduction for us because, we believe, of the repeating patterns of interference between fixed, closely bonded wires. 

Our REDpurl geometry was developed to overcome this by allowing variations in wire spacing and alignment creating an asymmetric geometry that could be adapted to suit a variety of audio systems and tastes.

REDpurl™ advantages

Intersect not parallel

Conductors intersect at 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™ allows 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 helping to break up harmonic modes across the music spectrum that can affect dynamic control in an audio system.


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.

Conductor diameter

An audio cable capable of delivering a full range of dynamics and weight across the frequency spectrum requires different diameter conductors. For example, smaller gauge wires can deliver excellent detail and dynamics in the upper frequency range, but can lack weight in the bass 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 have carried out extensive tests on cable shielding and have observed that 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. We therefore, don’t use shielding, preferring to rely on our REDpurl™ geometry to keep RFI at bay.  

Our RCA interconnects (but not our speaker cables) are directional with the signal travelling in the direction of the wire on wire annotated heat-shrink.


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