
Arran Ultra L RCA Grun
State-of-the-art OCC copper interconnect.

A new generation. Technically and sonically sophisticated cables created to complement the world’s finest stereo components, the Arran family represents Atlas’ most accomplished OCC copper audio cables to date.
The Arran Ultra L RCA Grun is our top-of-the-range OCC copper interconnect, created as a true ‘no compromise’ design to complement the performance of the finest audio systems.
Arran uses the highest quality ‘6N’ (99.99997% purity) elongated-crystal copper manufactured using the OCC (Ohno Continuous Casting) process, ensuring the signal follows a faster, cleaner and more direct path. The cable utilises a pair of conductors comprising six solid OCC strands surrounding a seventh central core, tension-wrapped in a microporous PTFE dielectric.
An advanced continuous screen with a copper shielding braid ensures minimal RF interference and noise susceptibility. The unique 3D-printed liner within the Ultra L plug reduces the influence of the connector itself to extremely low levels.
The cable also incorporates our precision dd (dual-drain) system, where twin symmetrical drain wires connect the screen to the cable return/plug interface, allowing cable termination without distorting, twisting or mechanically stressing the precision-laid screen, along with Atlas’ Grun Coherent Earthing System (Grun lead & spade adapter included).
The result is a beautifully balanced, temporally coherent, natural sound with a vanishingly low noise floor and deceptively wide dynamic range. Music gains both time and space; listening to music via Arran has a pervasive sense of calm; an extremely high level of detail is apparent, but only as part of a coherent whole, without any sense of artificial emphasis or exaggeration.
We designed every single aspect of Arran to minimise any audible signature.
Remove the influence of the cable itself, and only the music remains.
Key Features. Essential characteristics of this product.




Product Specifications.
Construction | Symmetrical/Solid |
Conductor | OCC Copper |
Dielectric | Microporous PTFE/PEF |
Screen | Foil/OFC braid; Dual Drain |
Capacitance | 28.54 pF/m |
Inductance | 0.866 µH/m |
Resistance | 0.0199 Ohms/m |
Outside Diameter | 10.8 mm |
Colour/Finish | Blue Fabric/Luxe options |
What’s In The Box?

- Interconnect Cable Pair
- Grun Cable 1:2 1
- Grun Spade Adapter 1
- Cleaning Cloth 1
- Cotton Gloves Pair
- USB Stick 1
Reviews. What the specialist media say…

I got a dramatic increase in detail resolution presented in an entirely fluid and distinctly three- dimensional fashion. What started out as intrigue became an odyssey into unheard realms of my music collection with the Atlas Arran Ultra L RCA Grun cables. If you want to get a better idea of just how much musical detail your equipment can resolve, I suggest you try them. Be warned, however, there may be no going back.

I reviewed two pairs of Arran Ultra L RCA Grun but started with one replacing my usual interconnect between DAC and preamplifier. The result was not subtle at all, I usually get a change in imaging or a small improvement or loss in timing with interconnect changes but this was massive. To use a photographic analogy it was almost like going from black and white to colour imagery.
What Atlas have done with the Arran Ultra L RCA Grun sets a benchmark for cable resolution… It’s one of those components that becomes more essential the longer you use it, this cable is addictive.

After auditioning the Arran interconnects and loudspeaker cables in three different setups, it’s evident these products are aimed at purists already satisfied with the balance of their carefully curated components and in search of wiring that allows the true potential of their system to be heard with minimal loss of fidelity.
It would, however, be wrong to infer from this that Arran is a forensic tool better suited to the critiquing of components and recordings than the enjoyment of performances. If anything, I found the Atlas offerings more musically engaging than the reference cables they replaced.