Shunyata Research Sigma-X NR Power Cable | Reference Noise-Reducing Cord
Shunyata Research Sigma-X NR is the reference noise-reducing power cable in the Sigma-X family for amplifiers, preamplifiers, DACs, streamers, analog sources, and other high-performance components. It combines 6-gauge VTX-Ag conductors with Gen3 NR noise reduction, dual TAPc polarizers, CopperCONN connectors, fluorocarbon dielectric materials, and KPIP v2 processing.
Choose Sigma-X NR when you want reference-level power-line noise reduction across a wide range of components without stepping up to the QR model's patented QR/BB current-reserve technology.
Most products are ordered from the manufacturer, and lead times range from a few days to several weeks. We'll confirm your exact ship time before payment is processed. Free shipping on orders of $1,000 or more within the lower 48 states; smaller orders ship at FedEx rates. Alaska, Hawaii, and U.S. territories: please contact us for a shipping quote.
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Wondering how this will sound in your system? Many products are eligible for our 10-day Home Audition Program, so you can listen in your own home before deciding to keep it. Call 651-217-2083 or email sales@choiceaudio.com for details.
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SIGMA-X NR POWER CABLE
Shunyata Research Sigma-X NR is the reference noise-reducing power cable in the Sigma-X family, for amplifiers, preamplifiers, DACs, streamers, analog sources and other high-performance components. It combines 6-gauge VTX-Ag conductors with Gen3 NR noise reduction, dual TAPc polarizers, CopperCONN connectors, fluorocarbon dielectric and four days of KPIP v2 processing.
WHO IS SIGMA-X NR FOR?
Amplifiers, preamplifiers, DACs, streamers, phono stages and other high-performance components that benefit from Sigma-X reference noise reduction.
SIGMA-X NR VS. QR
NR provides the Sigma-X Gen3 NR platform without QR's patented QR/BB current-reserve technology.
TECHNOLOGY
 | TAPc (Transverse Axial Polarizer) is Shunyata Research's patent-pending technology that couples to the electromagnetic fields surrounding conductors and is designed to reduce electromagnetic distortion. Sigma-X NR uses two TAPc polarizers. |
 | Gen3 NR is Shunyata's power-cable noise-reduction architecture. Sigma-X NR is specified for greater than 6 dB of noise reduction at 1 MHz. |
 | VTX-Ag geometry combines a pure-silver center conductor with a concentric pure-copper outer conductor. Sigma-X NR uses this architecture in a 6-gauge configuration. |
 | CopperCONN AC and IEC connectors with carbon-fiber bodies are used on Sigma-X NR. |
 | Fluorocarbon dielectric material is selected for low dielectric absorption, high dielectric strength and heat resistance. |
 | KPIP v2™ is Shunyata Research's proprietary Kinetic Phase Inversion Process, applied to conductor and terminal metals. Sigma-X NR receives four days of KPIP v2 processing. |
SPECIFICATIONS
Conductors: VTX-Ag Gauge: 06 Construction: 1″ tube Dielectric: Fluorocarbon Noise Reduction: > 6 dB @ 1 MHz TAPc: 2 polarizers | AC Connector: CopperCONN™ Carbon-Fiber IEC Connector: CopperCONN™ Carbon-Fiber KPIP v2 Processing: 4 days Color: Black flex Standard Length: 1.75 meters Safety Assurance: |
CHOICE AUDIO GUIDANCE
NR is the versatile Sigma-X choice when reference-grade power-line noise reduction is the priority across source and amplification components.
FREQUENTLY ASKED QUESTIONS
Can NR be used on amplifiers?
Yes. Shunyata specifies NR for amplifiers as well as source and line-level components.
Does NR have QR/BB?
No.
What is the standard length?
1.75 meters.
SHUNYATA SIGMA-X NR REVIEWS & REFERENCES
 | Stereo Times (USA) — Don Shaulis, June 2025 Don Shaulis set out to try three Sigma-X NR cords on his source components and ended up ordering two more for his VAC monoblock amplifiers before the first song finished. He heard a quieter background, a bigger and more physical presentation, and better-defined drums, with the largest gains in presence and dynamics on the amplifiers. He described it as the rare power-cord change that improved everything at once instead of trading one quality for another. |