Diamond Neptune Power Cord

New for 2019, the Neptune AC power cable is improved and updated from Luminist to the Diamond Revision! Our audio engineers set out to improve every facet of the well-loved Neptune AC.

First, we enhanced the Fluid formula for the Neptune AC power to further reduce noise and vibration. Second, we utilized the beautiful Furutech NCF power connectors (US FI-50M NCF or EU FI-E50 NCF and 15A IEC FI-50 NCF).

Finally, our audio engineers incorporated Nano technology silver wire into the build by carefully hand-wrapping the Nano silver wire around each of the 8 gauge Pure Copper Continuous Cast conductors.

The Diamond Revision Neptune AC Power cable possesses a lucullan midrange that seduces you with its rich, three dimensional presentation of vocalists; a deep, wide soundstage with velvety, rich, silent dark space between instruments that present themselves with golden tonality.

All Diamond Revision Neptune power cables come packaged in a handsome soft case.

Diamond Neptune Power Cord Technical Specifications
ConductorsPCCC & Nano PSCC
MetalsCu & Ag
Shielding99%
Dielectric MaterialP.V.C.
Gauge (effective)8 AWG
Dampening MaterialEnhanced Fluid
Current Capacity DC (cable only)73 A
Current Capacity (overall product)15 A with 15 amp IECC / 20 A with 20 amp IECC
Resistance0.00165 Ω/m
Estimated Break-In Time250 Hours
Cable Diameter1-1/4 Inch
Connector TypeFI-50M (NCF) or FI-E50 (NCF) with FI-50 (NCF) or FI-52 (NCF)
Material TreatmentTriple (3x) Cryomag©

What They're Saying

"Big, spacious, warmer than leaner... though not in a way that is overly warm or ripe... the Neptune line is a whole lot of fun. Which is what we are hearing when we play music--not only from ourselves, but from many others passing through. You get the resolution and details, but not in an analytical, in your face presentation. Nothing is pushed at you, suggesting that the cables are quite even in terms of frequencies--that is, they are not hyped or rolled-off. There is neither a euphonic coloration or any sense of some anomaly to push this or that on our music. Balanced and musical. Sweet. Warm and musical."

"Ex-NASA engineer Jim Aud and his team have advanced their thinking, culminating in a reference fluid-shielded cable--the Neptune. It is the newest addition to Purist Audio Design's Luminist Revision series, developed partly in response to customer feedback to make the cables more flexible and user-friendly, while also increasing their performance. The Neptune comes in a four-cable set with positive and negative signals separated. The fluid shields the 7AWG bundle of fine single-crystal-copper strands from RF, EMI, and vibration. The shielding helped produce a huge soundstage with explosive dynamics in a system with Atma-Sphere electronics and Classic Audio loudspeakers."

"Showing with Ralph Karsten’s Atma-Sphere Novacron amps ($19,200/pr.), and the Purist Audio Design Neptune series of cables, there is no denying the synergy. I sat utterly rapt in Stevie Ray Vaughn’s guitar work, and simply have to marvel at the ability John’s speakers have to delve into and release music in one of the most dynamically and harmonically correct presentations you’ll hear."