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 Atlas AILSA Ultra RCA Grun 


High resolution RCA interconnect cable using much of the technology developed for our highly acclaimed Mavros & Asimi ranges.


The Ailsa Ultra RCA Grun is a wide-bandwidth interconnect designed to maximise the performance of high-performance audio systems. Based on the very well-reviewed Ailsa Achromatic RCA, the Ultra Grun version seeks to maximise the performance potential inherent in the Ailsa topology. Cable configuration is our new ‘balanced core’ geometry. Connectors are upgraded to custom-designed low-mass Ultra RCA plugs. It incorporates our precision dd (dual-drain) system and Atlas’ Grun Coherent Earthing System connector (basic adapter included).


Ailsa’'s ‘balanced core’ geometry results from a new ‘ground-up’ approach to multicore cable design, by delivering a balanced flow in both the signal and return conductors.

The Ailsa combines unusually high-quality materials – ultra-high purity OCC conductor, Copper Mylar foil shield and microporous PTFE dielectric – with our high-precision Ultra RCA connector and Grun compatibility.

We based our ‘dd’ (dual-drain) configuration on techniques originally developed for our top-of-the-range Mavros and Asimi interconnects. 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. Typically, screened cables suffer from screen distortion when prepared for production. Cutting and twisting the screening braid has a measurable impact, effectively changing the impedance and, therefore, the cable's performance.

The benefits are maintaining a constant low impedance load to the plug and total 360° screening against noise and signal degradation caused by RFI (Radio Frequency Interference).

The result is a beautifully balanced, open, accurate, natural sound which we think, like the Ailsa Achromatic RCA, defines a new performance standard at its price point. The Ailsa Ultra RCA Grun represents an ideal upgrade path for owners of our other co-ax interconnects.




An independent system earth engineered to reduce the RFI and EMI ‘noise’ which frequently degrades audio performance.



The Ultra is a wide-band, OCC copper, constant impedance, self-cleaning, solder-free construction RCA plug.



OCC (Ohno Continuous Casting) process was developed by Professor Ohno, from the Chiba Institute of Technology, to manufacture a very high purity single grain copper or silver. There are only a handful of companies in the world manufacturing via this method.



Microporous PTFE (Teflon™) is a unique, low density dielectric material, phase stable at room temperature, which offers significant performance improvements over solid PTFE (Teflon™) dielectric designs.


CONSTRUCTION—4 core + screen dd

Individually matched conductors (one pair for signal path, the other pair acts as the return conductor) enclosed within a protective woven screen. Combined with our dd (dual drain) system which avoids distortion of the screening braid during assembly, which can change the RF impedance of the cable and adversely affect performance.

Atlas AILSA Ultra RCA Grun

  • Construction Multi-core
    Material OCC
    Dielectric Microporous PTFE
    Screen Braid + Mylar™, 100%
    Capacitance 133.9 pF/m
    Inductance 0.332 µH/m
    Resistance 0.0238 Ohm/m
    Outside Diameter 10 mm
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