
Zeno Harmonic SC Grun
Reference-class OCC copper balanced headphone cable.

A no-compromise fully-balanced design created to complement the world’s highest fidelity headphones.
‘High end’ headphones continue to grow in popularity, but it‘s still demonstrably true that the great majority of original cables supplied with even expensive models fall short of delivering the full performance potential of the headphone itself.
The Zeno Harmonic Grun cable addresses this by combining very high-purity solid-core OCC copper conductors in a true dual-balanced design combined with our Grun Coherent Earthing System.
During the development and testing phase, it was again evident that solid core conductors performed better than stranded conductors (true as a general rule, but not always practical to implement in practice). Solid-core conductors are less prone to suffer from vibration issues which can contribute to a slight ‘smearing’ and loss of temporal accuracy, crucial factors under the scrutiny of ‘high end’ headphone listening.
We achieved another significant improvement in dielectric efficiency; an advanced wideband dielectric ‘Physical FPE’ facilitates accuracy, neutrality and natural-sounding fidelity. In combination with Grun, Zeno Harmonic has exceptional resistance to RFI and EMI 'noise,' achieving an astonishingly low noise floor and extremely wide dynamic range.
Zeno Harmonic features our low-mass, wide bandwidth 4 pin OCC XLR or 4.4mm TRRS connectors with our precision-crimped airtight metal-to-metal construction methods, the objective being to produce a continuous solder-free high-integrity signal path without the typical breaks in material continuity which degrade ultimate fidelity.
Listening is the ultimate test; headphones provide a unique perspective on your favourite recordings. We believe Zeno Harmonic SC Grun will bring new musical insights and outstanding pleasure to the most demanding of listeners.
Supplied as standard with a 1m Grun cable and spade tag adapter. Further performance gains can be achieved via an optional Grun mains adapter.
Atlas assemble all Zeno cables by hand in Scotland, meaning we can create a superb cable to your precise requirements, so get in touch direct or via your Atlas dealer.
Standard cable lengths available are from 0.5m – 4m in 0.5m increments, custom lengths are available on request.
Key Features. Essential characteristics of this product.



Product Specifications.
Construction | Solid core twin balanced |
Conductor | OCC Copper |
Dielectric | PEF |
Screen | OFC braid |
Capacitance | 40.05 pF/m |
Inductance | 0.798 µH/m |
Resistance | 0.971 Ohms/m |
Outside Diameter | 8.6 mm |
Colour/Finish | Black Fabric/Luxe options |
Termination Options.
4mm TRRS or 4 pin XLR versions are available.
What’s In The Box?

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

GOOD: wide range of terminations, wide range of headphone types covered, wide range of cable lengths, general sound quality.
BAD: nothing.
(Applies to range of three Zeno cables).

Overall this is a fabulous sound, and it is a privilege for me to listen to this set-up. On my HiFi journey to the best headphones ever, this is surely ‘nirvana’. In my rating system, again, these are simply 5 stars. ‘Outstanding’.
(Mavros USB Grun & Zeno Harmonic Grun).