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Isotek V5 Sirius

Regular price $1,195.00 USD
Regular price Sale price $1,195.00 USD
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The new V5 Sirius is an ultra-high performance 16A power bar, harnessing IsoTek’s latest mains power cleaning technology, which both protects and improves your audio systems performance. If more power output sockets are required a unique IsoTek ‘System Link’ connector is provided, this allows you to connect multiple IsoTek units together whilst maintaining star-earth. In addition, an easy resettable fusing system offers a substantial upgrade over a standard ordinary  glass fuse due to an increased contact area.



  • Suitable for all audio-, AV-, or network based systems
  • RFI reduction up to 45dB
  • Central clean power network removes Common and Differential Mode mains noise
  • 6 independent outlets stop Differential Mode cross contamination (16A / 3‘680W @
  • 230V or 1’890W @ 115V)
  • 54’000A instantaneous protection
  • Fully star-earthed network
  • Multi-strand 6n OFC silver-plated internal wiring with FEP dielectric
  • Easy reset fusing system
  • Wall mounting bracket kit included
  • SYSTEM LINK outlet for extending the outlets and maintaining a starred earth reference
  • Supplied with IsoTek EVO3 PREMIER POWER CABLE
  • UK, EU, US, AU & CH outlets available




Differential Mode mains noise is created by all electrical appliances – everything with a power supply, in fact. This includes your microwave oven, your television and your computer, as well as every hi-fi component you own.

Common Mode mains noise is often referred to as RFI – transmitted frequencies that surround us but we cannot see. For example, imagine how much data is transmitted by smartphones and tablets; cheap power cables act as aerials (antennas) for these unwanted frequencies.



From a high quality audio point of view, mains electricity needs two factors; a nice 50 or 60Hz sine wave supplied from a very low impedance source, without radio frequency noise. The low impedance makes for a near constant voltage regardless of how much power is used in the surrounding area. In reality we can typically expect around 5% fluctuation. The very low impedance of the mains, which is way below 1 ohm at 50 or 60Hz is not maintained when approaching radio frequencies (> 50 ohms > 100 kHz) and acts as an aerial (antenna) inviting RF noise.

IsoTek’s power cleaning circuits are designed to reduce impedance whilst remaining safe as well as correcting well into the audio frequency bands. This is not only a judgment from sound electrical engineering, but it also follows the codes of electrical safety, which are independently assessed.



IsoTek products feature outlet sockets that are totally independent from each other; no two outlet sockets being directly connected. This is a critical point for limiting or eliminating the cross contamination of Differential Mode mains noise.

Each socket connects directly back to the PCB and is serviced by IsoTek’s unique power cleaning technologies.



Every IsoTek product uses the finest grade electrical components, many custom made, using the highest quality metals and materials which are specifically designed for purpose. Quality doesn’t stop at parts but also extends into the PCB designs, which maintain high levels of amperage and extraordinarily low levels of resistance, using up to eight times the general standard of copper prior to pure silver plating.

Internal wiring also uses high purity coppers combined with silver plating, with either Fluorinated Ethylene Propylene (FEP) dielectric or IsoTek’s Virtual Dielectric of Air (VDA), where a FEP tube is wound around the conductor before an extruded FEP dielectric protects this construction giving unrivalled performance and the ultimate low resistance, high performance internal power delivery system.



Power surges or spikes on the mains supply are generally very bad for any electrical device especially a high quality audio replay system. Power surges occur when there is a boost to the electrical charge at some point in the power lines. This causes an increase in the electrical potential energy, which can increase the current flowing to your wall outlet. This in turn can damage your sensitive audio system.

The IsoTek protection system uses an array of VDRs which offer a cascading level of protection, in some cases over 100’000A. These step in fast and sequentially dependent upon the severity of the encountered power surge or spike. The architecture of the protection circuit extends dramatically and almost instantly when required.

The protection circuit has two primary functions, one to preserve itself and the second to step in gradually as any problem increases, with the ability to act very fast should an extreme condition occur. The protection circuits also protect the filters and the filters assist the protection in the initial stage. Unlike many protection devices these assist sound quality as well as providing protection.  Studies suggest this problem is not subtle and is frequent. The disturbing challenge is the 1’000 to 6’000V range. It is likely most protection systems do very little good and probably cause sound degradation.



Technical papers state that Kirchhoff’s circuit laws are two equalities that deal with the current and potential difference (commonly known as voltage) in the lumped element model of electrical circuits. They were first described in 1845 by German physicist Gustav Kirchhoff. This generalized the work of Georg Ohm and preceded the work of James Clerk Maxwell. Widely used in electrical engineering, they are also called Kirchhoff’s rules or simply Kirchhoff’s laws. These laws can be applied in time and frequency domains and form the basis for network analysis.

The guiding principles for IsoTek circuits are driven by Kirchhoff’s two current laws, a simple analogy would be that for every litre of water placed into a water distribution system we would expect to get the same out.

To put it another way, Kirchhoff and Gauss described how seemingly impossible problems could be resolved by the concept of a town. If traffic flows on a circular orbital road around the town there is no effect on the town. However, if traffic enters the town, then there will be an effect on the town, and however many cars that enter eventually have to leave. The structure of that town will have either a positive or negative effect on that migration. In electronics this is also true. We must totally respect the signal path as, whether one wishes it or not, ultimately everything will be in the signal path to a greater or lesser degree.



As one would expect, the internal wiring of any IsoTek product is of the highest standard, pure 6n OFC (Oxygen Free Copper – 99.9999%) conductor strands with silver-plating offer low resistance and high amperage. An FEP dielectric is used to protect the conductors as well as giving the ultimate internal power delivery system.

IsoTek’s internal wiring synergizes with the range of IsoTek power cables. One critical but overlooked area is maintaining commonality of design and material properties though an audio wiring loom, be it signal carrying cables or your power cable network.



IsoTek delivers absolute power, unrestricted current delivery within what the power company can supply, and regulations allow. Generally, for power amplifiers or high wattage electronics IsoTek provides output which offers extremely low impedance and low DCR, this completely eliminates (within the concepts of power filtering) any possibility of current restriction and enhances dynamic range, the impedance of the chain back to the power station being far larger. When power is contaminated, dynamic range is reduced.

It is impossible to get more than 100% out of the mains supply. The very principle of AC power is that it doesn’t store energy in the transmission system. It is therefore impossible to store energy in an AC system by the very principles by which it works. There can be no so-called power reserve, thus a power reserve within an AC circuit in the truest sense of the word does not and cannot exist.

Power reserve would require the voltage to increase as ohms law insists it must, saying a circuit doesn’t sag isn’t a reserve of power. The AC waveform goes between maximum and minimum points at 50 Hz in 10 mS, it then swings to the maximum negative value. At 20 mS a full cycle is achieved. Therefore, in fact the average values of an AC waveform is zero. Only as a power wave can it be positive, this is due to the law of squared negatives. It looks like a ballooned sine wave where the value of 45 degrees is 0.5 not 0.7071 from a trigonometric table. Were this only a voltage wave it would have a long-term value of zero! As far as energy storage is concerned zero is the value of stored energy.

Direct Current resistance (DCR) will cause sag. To put it in other words, a system has to be developed which does not limit the power reserve of the power station, meaning a circuit needs to have extremely low resistance whilst maintaining sufficiently high inductance. When done correctly and in perfect balance the inductance is virtually zero at 50/60 Hz and the Direct Current resistance (DCR) is also very close to zero. Therefore, an ideal filter circuit must maintain zero Ohms resistance DC (or very close) and considerable AC resistance to noise above 50/60 Hz. Despite statements to the contrary, this is precisely where correctly specified materials matter most. Whilst some might consider these ‘exotic’ they represent a critical and important part of the function and appropriate to use. Remarkably IsoTek filter designs can maintain very low resistance at 50/60Hz but have very high amounts of noise cancellation above that frequency.

Most AC circuits are reactive – produce a reaction either from the power drawn or the circuit itself, put simply they are not pure resistors and behave like a capacitance and resistance or an inductance and resistance. In an ideal world the only allowable impediment is resistance and ideally this needs to be extremely low. A dilemma, do you want high transient power, or do you want heavy filtration – amazingly you can have both, but one must have components of the very highest quality, which are designed specifically for purpose with totally correct architecture. This is extremely complex and has resulted in the design of specialist parts; these do not exist outside the world of specialist power engineering and are unique to IsoTek designs.



Some IsoTek products (all V5) contain a System Link outlet, which is designed to connect multiple units together, maintaining a stared earth reference, and preserving the need for multiple wall outlet sockets.

This is particularly useful for joining multiple units together using our System Link cable available in EVO3 Initium, EVO3 Premier, EVO3 Sequel and EVO3 Optimum quality.



As part of our on-going commitment to the highest standards of customer service, IsoTek offers you the opportunity to extend the standard 2 years product warranty to 3 years, free of charge.

Simply REGISTER YOUR PURCHASE with IsoTek. We do not share your personal details with any third parties without your permission.




Each output socket is individually wired, no two (or more) being connected, each referencing back to the central power cleaning network, ideal for the reduction and elimination of Differential Mode mains noise cross contamination.

IsoTek’s unique ‘SYSTEM LINK’ additional output connector is provided to allow you to connect multiple IsoTek units together whilst maintaining star-earth.

The V5 Sirius features a greatly enhanced high power shunt filter network delivering -23dB mains noise reduction at 10 kHz -40dB, 100 kHz and -60dB at 1 MHz (Ref 50 ohms 20dB, this is considerably superior to typical textbook designs and an ideal for tackling Common Mode mains noise).

A unique high grade, high amperage mains noise choke based system is combined with a high frequency delta filter network to eliminate of both Common Mode and Differential Mode mains noise across a wide frequency range.

V5 Sirius features KERP © (Kirchoff’s Equal Resistance Path) which ensures equal resistance and equal power delivery to all outlets.

The internal wiring is unique and specifically designed to offer the highest standards of power delivery, pure 6n oxygen free copper conductor multi but minimal strands with silver-plating designed to offer low resistance and high amperage. An FEP dielectric is then used to protect the conductors offering a low dielectric constance.

54’000 Amps instantaneous yet transient protection system enhances sound as well as protecting precious audio components from dangerous power surges and voltage spikes.

The easy resettable fusing system offers a substantial upgrade over a standard ordinary fuse due to increased contact area. By shear virtue of its electrical function a standard fuse must have a very thin wire, this being also true of expensive audiophile grade gold plated versions.

A special, easy to install wall bracket system is provided which allows you to mount the V5 Sirius discretely behind your audio system if required.



IsoTek V5 Sirius - Read More

"Whatever kind of black magic Keith Martin has developed for the new generation of V5 filters, he has implemented a fair amount of it in all models - it works best in the most affordable ones, because you expect a subconsciously small shift from the bar, while the new IsoTek series delivers significantly more than just it. Especially on the available components from Cambridge, the quality of the output jumped by an order of magnitude, more than what would probably result from replacing any of the devices or cables with the same amount of investment. Although objectively the price / performance ratio is not as wonderful as that of the V5 Polaris , the V5 Sirius is still better from the same point of view - in a direct comparison, it allowed the system to reveal a little more detail, play even more openly and thus overall more fun. If you are looking for a rational upgrade of your setup, even the V5 Sirius from IsoTek should be a hot candidate, if you do not have something even more efficient to solve the power supply." - Daniel Březina 


Clean energy - Read More

"If you are curious, you should listen to the "Olympic Fanfare And Theme" with the Berlin Philharmonic Orchestra conducted by John Williams. As soon as the V5 Sirius is in use, all details are contoured, even the reverberation becomes much more believable; and when the winds blare the theme, the punch is a completely different one. Of course, we know of positive sonic effects of this magnitude from other mains filters, but never before has there been this result with a three-digit price tag. "


Clean Your Power With IsoTek V5 Sirius - Read More

"The internal wiring is unique to Sirius, composed of pure 6n oxygen-free copper conductor strands with silver plating, offering low resistance and high amperage. An FEP dielectric is then used to protect the conductors, offering the ultimate low-resistance power delivery system. Furthermore, a 54,000A instantaneous yet transient protection system is said to “enhance sound quality as well as protecting precious audio components from dangerous power surges and voltage spikes”. This unique safeguarding system features IsoTek's sequential cascading VDR
protection method, which it says “offers superior safety without dynamic audio or sound restrictions”. " - MARC RUSHTON


IsoTek NEW V5 SIRIUS is said to be better than ever before - Read More

"The internal wiring of IsoTek products synergises with the range of IsoTek power cables. One critical but overlooked area is maintaining commonality of design and material properties though an audio wiring loom, be it signal carrying cables or the power cable network.

Housed in an extruded aluminium chassis, Sirius is a solid, hard-wearing power bar that can easily be wall mounted behind audio systems or placed discretely behind audio racks. Sirius is supplied with IsoTek’s multi award-winning Premier power cable." - Terry Ellis


 IsoTek Sirius review - Read More

"We’ve heard bigger leaps in performance from other mains filters, but they all cost considerably more than this one. Even with ‘standard’ mains leads, this is a worthwhile addition to a decent hi-fi set-up "



IsoTek V5 Corvus power strip – sound plus and component protection - Read More

"The IsoTek V5 Corvus shines in three ways: As a distribution strip, it presents generous connection capacities with nine slots for component-rich HiFi and AV systems. With its system link, it can also be easily expanded. Thanks to its surge protection, it offers all of these devices protection against destructive peaks and impulses in the network. In the new V5 version, this protection has been significantly expanded; it now extends to 45,000 amps. In addition to the protective circuit, the filter section has also been updated: The V5 Corvus effectively stops common and differential mode interference, prevents differential mode crosstalk between the slots and reduces radio interference. This allows the system to develop its sound potential: the playback has more transparency and details, greater plasticity and spatiality, better dynamics and greater precision, more volume, especially in the bass, and overall increases in coherence and relaxation. These are the merits of a clean power supply - and the V5 Corvus makes them possible on a large scale as the flagship among IsoTek's V5 strips. " - Volker Frech




MAINS VOLTAGE 100-240V / 50-60Hz
TOTAL WATTAGE 3'680W (@230V) / 1'840W (@115V)
DIMENSIONS (W X H X D) 88 x 55 x 555mm