IsoTek V5 Sigmas Power Conditioner

The IsoTek V5 Sigmas is a seven-outlet power conditioner from IsoTek (Bath, England), available at Vinyl Sound, an authorized IsoTek dealer in Buffalo, NY. Positioned above the V5 Aquarius in IsoTek's current lineup and a significant step forward from its EVO3 predecessor, the V5 Sigmas is effectively seven independent power cleaners in a single chassis: three high-current outlets (16A each) use a lighter version of the V5 Titan's Direct-Coupled© circuit for power amplifiers, subwoofers, active loudspeakers, and large-screen displays, while four medium-current outlets (10A each) use IsoTek's Adaptive Gating© technology for source components. Internal wiring is solid-core Ohno Continuous Cast (OCC) copper, silver-plated, with a Virtual Dielectric of Air (VDA) construction. IsoTek's KERP© (Kirchhoff's Equal Resistance Path) architecture ensures equal resistance and equal power delivery across all seven outlets. The V5 Sigmas delivers 80dB RFI reduction, 121,500A instantaneous surge protection, a fully star-earthed network, and a System Link outlet for connecting additional IsoTek units. The package includes IsoTek's award-winning EVO3 Premier power cable (1.5m).

Seven Independent Outlets — Direct-Coupled© High-Current and Adaptive Gating© Source Circuits

Where many power conditioners place all outlets on a single shared filter, the V5 Sigmas assigns a dedicated cleaning circuit to each of its seven outlets, preventing Differential Mode noise created by one connected component from cross-contaminating another. The three high-current outlets are rated at 16A each and employ a lighter version of the Direct-Coupled© circuit from IsoTek's flagship V5 Titan. This architecture maintains ultra-low impedance at the power delivery frequency while providing high impedance to noise above 50/60Hz, delivering unrestricted current to power amplifiers, active subwoofers, active loudspeakers, and high-wattage displays without the dynamic current limitations associated with conventional series filter designs. At 230V these three outlets provide up to 3,680W combined; at 115V, up to 1,840W. The four medium-current outlets are rated at 10A each and use IsoTek's Adaptive Gating© system, which autosenses the load presented by each connected source component and determines the appropriate level of differential filtration in real time. This allows the maximum achievable filtration to be applied to each outlet while respecting that component's actual current draw. The four source outlets provide up to 2,300W combined at 230V and 1,150W at 115V. The entire network is fully star-earthed, meaning all outlets share a single reference earth point rather than a daisy-chained arrangement — a configuration that minimises noise coupling between outlets and between the conditioner and connected components. The V5 Sigmas also marks a substantial improvement over its EVO3 predecessor, with over 35% improved amperage through decreased circuit resistance and a 40% increase in overall current handling capability.

OCC Silver Internal Wiring, Virtual Dielectric of Air, and KERP©

The V5 Sigmas uses solid-core Ohno Continuous Cast (OCC) copper for all internal wiring, a conductor type defined by its single-crystal grain structure. Standard oxygen-free copper (OFC) is drawn through conventional processes that produce numerous crystal grain boundaries throughout the conductor — each a point of elevated resistance and potential signal reflection. OCC copper, developed using a process that maintains a continuous crystal structure along the entire conductor length, eliminates these grain boundaries, producing lower DC resistance and higher conductivity than commercially produced OFC. The OCC conductors are silver-plated, adding a low-resistance surface layer that resists oxidation over the product's service life. The dielectric construction around the internal conductors is IsoTek's Virtual Dielectric of Air (VDA): a Fluorinated Ethylene Propylene (FEP) helix is first wound around each conductor strand, trapping air within the winding, before an extruded FEP outer dielectric encloses the assembly. The resulting construction approximates the dielectric constant of air — the theoretical minimum at 1.0 — while providing the mechanical protection of a solid FEP jacket. This gives the V5 Sigmas an internal power delivery system with resistance and dielectric performance significantly below what standard PVC-insulated OFC wiring can achieve. KERP© (Kirchhoff's Equal Resistance Path) is applied throughout the circuit architecture, ensuring that the resistance of the current path to each of the seven outlets is equal — so no outlet is electrically privileged over another and all connected components receive equivalent power delivery quality. Instantaneous surge protection is provided by an array of cascading VDRs (voltage-dependent resistors) rated at 121,500A, designed to step in sequentially as the severity of a voltage spike increases, with the protection circuit and filtering stages operating in support of each other.

Key Features

• Seven independent power cleaning circuits in a single chassis: three 16A high-current outlets with Direct-Coupled© circuit technology for power amplifiers, active subwoofers, active loudspeakers, and displays, plus four 10A medium-current outlets with Adaptive Gating© technology for source components
• 80dB RFI reduction targeting both Common Mode and Differential Mode mains noise, with each outlet's independent cleaning circuit preventing cross-contamination between connected components
• 121,500A instantaneous surge protection via a cascading VDR array that activates sequentially based on spike severity, with the protection and filter circuits operating in mutual support
• Solid-core Ohno Continuous Cast (OCC) copper, silver-plated internal wiring with Virtual Dielectric of Air (VDA) construction — FEP helix wound under extruded FEP dielectric — for near-air-dielectric performance and the lowest achievable internal resistance
• KERP© (Kirchhoff's Equal Resistance Path) architecture ensures equal resistance and equal power delivery quality to all seven outlets simultaneously
• Fully star-earthed network, System Link outlet for chaining additional IsoTek units, 16A IEC C20 mains inlet, mains voltage 100–240V / 50–60Hz, and includes IsoTek's award-winning EVO3 Premier power cable (1.5m); dimensions 450 × 150 × 350mm, 15kg

Technical Specifications

Frequently Asked Questions

What is the IsoTek V5 Sigmas?

The IsoTek V5 Sigmas is a seven-outlet power conditioner that functions as seven independent power cleaning circuits in a single chassis. It combines three 16A high-current outlets using IsoTek's Direct-Coupled© circuit for power amplifiers and large displays with four 10A medium-current outlets using Adaptive Gating© for source components. It delivers 80dB RFI reduction, 121,500A surge protection, OCC silver internal wiring with Virtual Dielectric of Air (VDA) construction, and KERP© star-earthed architecture. The V5 Sigmas is available at Vinyl Sound, an authorized IsoTek dealer in Buffalo, NY, and includes IsoTek's award-winning EVO3 Premier power cable.

How does the V5 Sigmas compare to the V5 Aquarius or V5 Sirius?

The V5 Sirius is IsoTek's six-outlet power bar design with uniform outlets, 45dB RFI reduction, and 54,000A surge protection using 6N OFC silver-plated internal wiring. The V5 Aquarius is IsoTek's entry-point V5 conditioner without the split high-current / source circuit architecture. The V5 Sigmas advances significantly on both: 7 outlets with separate Direct-Coupled© high-current and Adaptive Gating© source circuits, 80dB RFI reduction, 121,500A protection, solid-core OCC copper with VDA dielectric internally, and KERP© for equal power delivery to all outlets. It represents over 35% improved amperage and 40% greater current handling than the EVO3 predecessor it replaces. Vinyl Sound in Buffalo, NY carries IsoTek conditioners across the V5 range for comparison.

What does 80dB RFI reduction mean for an audio system?

RFI (Radio Frequency Interference) enters a mains supply as Common Mode noise from external sources — transmitted frequencies from nearby wireless devices, cellular signals, and broadcast infrastructure — and is amplified by unshielded power cables acting as antennas. Differential Mode noise is generated internally by every power supply in every appliance on the circuit. Left unaddressed, both types contaminate the power supply of connected audio components and raise the noise floor of the system. 80dB RFI reduction means the V5 Sigmas attenuates RFI to one hundred-thousandth of its input level at the outlet — a substantial reduction that measurably lowers the noise floor of connected equipment and resolves fine detail that mains noise was obscuring.

What is the difference between the high-current Direct-Coupled© outlets and the Adaptive Gating© source outlets?

The three high-current outlets use a lighter version of the Direct-Coupled© circuit from IsoTek's V5 Titan. This design maintains an extremely low impedance at 50/60Hz — the power delivery frequency — while presenting very high impedance to noise above that frequency. The result is unrestricted current delivery to power amplifiers and large-current components without the dynamic limitation that some filter designs impose under transient load. The four medium-current source outlets use Adaptive Gating©, a system that autosenses the load each connected source component presents and applies the maximum achievable level of differential filtration for that specific load. Both circuit types prevent Differential Mode noise from one outlet contaminating any other, as each outlet connects independently back to the PCB with no shared path between sockets.

What is KERP© and what does it do?

KERP© stands for Kirchhoff's Equal Resistance Path, applying Kirchhoff's circuit laws to ensure the electrical resistance of the path from the mains inlet to each of the seven outlets is equal. In a poorly designed power distribution circuit, some outlets are electrically closer to the source than others, receiving lower-impedance power while outlying outlets receive marginally higher-impedance power. KERP© eliminates this inequality so that every connected component — whether a source component or a power amplifier — receives equivalent-quality power delivery. Combined with the star-earth network, this means all seven outlets share the same reference potential and the same resistance to the supply point.

What components should I connect to which outlets on the V5 Sigmas?

The three high-current outlets (16A, Direct-Coupled© circuit) are designed for power amplifiers, active subwoofers, active loudspeakers, and large displays — any component that draws significant sustained or peak current. The four medium-current outlets (10A, Adaptive Gating© circuit) are designed for source components: CD players, streamers, DACs, preamplifiers, phono stages, and similar lower-current devices. Mixing source components and amplifiers on the same outlet type is not harmful but does not take full advantage of the V5 Sigmas's differentiated circuit architecture. Vinyl Sound in Buffalo, NY can assist with system planning and optimal outlet assignment for your specific equipment combination.

Where to buy the IsoTek V5 Sigmas in Buffalo, NY?

The IsoTek V5 Sigmas is available at Vinyl Sound, an authorized IsoTek dealer in Buffalo, NY, serving customers across Western New York and the United States. Contact Vinyl Sound Buffalo to confirm current availability in your preferred outlet configuration (UK, EU, US, AU, or CH) and to discuss IsoTek power conditioning options across the V5 range.