Audio T Verdict
The IsoTek V5 Gemini is a compact two-outlet mains power-cleaning system designed for a simple hi-fi or home cinema setup, or as a tidy way to add further sockets to a compatible IsoTek installation.
Both outlets connect independently to the central filtering circuit rather than being joined together in a conventional daisy-chain arrangement. This is designed to reduce mains noise entering the system and limit electrical contamination passing from one connected component into the other.
With a shared capacity of 10A or 2,300W at 230V, Gemini can support many two-component systems, including a source and amplifier combination, provided the complete electrical load remains within its rating.
Its compact 270mm enclosure can sit discreetly behind an equipment rack or be installed using the supplied mounting bracket, while System Link provides a straightforward route for expanding an existing IsoTek power arrangement.
Gemini does not regenerate the mains or remove DC offset, but it provides a well-engineered alternative to an ordinary two-way extension block, with 35dB published RFI reduction and 45,000A surge protection.
IsoTek V5 Gemini Two-Way Mains Power-Cleaning System
The V5 Gemini combines two-way mains distribution, passive power cleaning and surge protection within one compact aluminium enclosure.
It is designed for straightforward two-component systems, such as a network streamer and integrated amplifier, or for installations where a full six-way or nine-way power bar would provide more sockets than required.
Gemini can also connect to another compatible IsoTek product through System Link, extending the available outlet count while maintaining a common star-earth reference.
Two Independent Outlets
Many conventional extension blocks connect their sockets together in a simple sequence. Although this distributes power, it can also allow electrical noise produced by one component to pass more easily into another.
The two Gemini sockets connect independently to the central printed circuit board and power-cleaning network.
This layout is designed to reduce Differential Mode cross-contamination between the connected products while providing both sockets with a consistent route back through the conditioner.
Ideal for a Simple Two-Component System
The two-outlet layout suits systems built around a source component and amplifier.
Possible combinations include a network streamer with an integrated amplifier, a CD player with an amplifier, or a television with a compatible soundbar or home cinema component.
The connected products must use suitable UK mains plugs and their combined mains consumption must remain within Gemini’s total electrical rating.
Typical Two-Component Combinations
- Network streamer and integrated amplifier
- CD player and integrated amplifier
- Turntable power supply and phono stage
- DAC and headphone amplifier
- Music server and network switch
- Television and compatible soundbar
- AV processor and power amplifier
- Active speaker pair using one mains connection per cabinet
10A or 2,300W Total Capacity
The UK V5 Gemini is rated at a maximum of 10A or 2,300W at 230V.
This capacity is shared between both outlets. It is not available separately from each socket and should not be doubled simply because two connections are provided.
Add together the published mains consumption of both connected products before installation.
Use the Equipment’s Mains Consumption
Do not use an amplifier’s watts-per-channel output when calculating the electrical load.
Refer to the rear-panel electrical rating, operating instructions or manufacturer’s published mains consumption.
Suitable for Compatible Amplifiers
Gemini may be used with a compatible integrated amplifier or power amplifier where the complete system remains within its 10A rating.
The filtering circuit is designed to maintain low resistance at the 50Hz mains frequency while presenting greater impedance to unwanted noise at higher frequencies.
Particularly demanding amplifiers, multiple power amplifiers or systems approaching the 2,300W limit may be better suited to a 16A IsoTek product such as the V5 Sirius.
Common Mode Mains Noise
Common Mode noise appears in relation to earth and frequently includes radio-frequency interference generated by wireless communications and electrical devices.
Routers, smartphones, computers, televisions, chargers and switch-mode power supplies all contribute to the radio-frequency environment within a modern home.
Gemini’s central filter network is designed to reduce this unwanted high-frequency energy before it reaches the connected equipment.
Differential Mode Mains Noise
Differential Mode noise appears between live and neutral and can be produced by the power supplies inside connected electrical products.
A streamer, television or network switch may return high-frequency switching noise to the mains circuit even where the household supply itself is relatively clean.
The independent outlet architecture helps reduce the extent to which this noise passes from one Gemini socket into the other.
Delta Filter Topology
The V5 Gemini uses IsoTek’s delta filter topology to reduce mains interference over a broad frequency range.
IsoTek publishes more than 20dB of power cleaning at 1kHz and approximately 42dB at 10kHz under its stated reference conditions.
The practical result will depend on the incoming mains supply, the connected equipment and the frequency and source of the interference.
35dB Published RFI Reduction
IsoTek gives the V5 Gemini an overall published RFI reduction figure of up to 35dB.
This provides a useful point of comparison with other models in the IsoTek range, while the precise amount of noise reduction varies according to frequency and installation conditions.
Gemini remains a passive filtering product rather than a mains regenerator or voltage stabiliser.
Reducing Component Cross-Contamination
A mains conditioner must deal with noise arriving from the wall supply, but connected equipment can also generate interference of its own.
Digital products and switch-mode power supplies are common sources of Differential Mode noise, while an amplifier creates a changing load as it operates.
Providing each outlet with an independent route to the central circuit is designed to reduce unwanted interaction between the two connected components.
KERP Equal-Resistance Power Distribution
IsoTek describes its distribution architecture as KERP, meaning Kirchhoff’s Equal Resistance Path.
The design aims to provide each outlet with a consistent electrical path rather than positioning one socket after another in a conventional series arrangement.
This works alongside the independent socket connections to support consistent power delivery throughout the unit.
Fully Star-Earthed Network
The protective-earth connections reference a central point within Gemini rather than being passed sequentially from one outlet to the next.
This star-earth arrangement provides a common earth reference for the connected equipment and can be maintained when another compatible IsoTek product is added through System Link.
The V5 Gemini must be connected to a correctly installed mains supply with a functioning protective-earth connection.
Silver-Plated Circuit Board
The central printed circuit board uses increased copper loading compared with a conventional low-cost extension block.
The conductive paths are silver plated as part of IsoTek’s approach to maintaining low resistance and high current capacity through the power-cleaning circuit.
Both output sockets connect directly to this central board.
Silver-Plated 6N Copper Wiring
The internal wiring uses a 2mm² multi-strand conductor design made from 6N oxygen-free copper.
IsoTek describes 6N copper as 99.9999% pure, with each strand silver plated to provide a highly conductive outer surface.
The multi-strand format helps the internal wiring remain manageable while supporting Gemini’s 10A rating.
FEP Dielectric
The internal conductors are insulated using Fluorinated Ethylene Propylene, commonly abbreviated to FEP.
FEP provides durable electrical insulation while offering a relatively low dielectric constant compared with materials used in many ordinary power products.
The same general material is used within several IsoTek power cables, helping maintain a consistent approach throughout the mains connection.
45,000A Surge Protection
V5 Gemini incorporates IsoTek’s sequential and repeatable surge-protection network, with an instantaneous rating of 45,000A.
The circuit is designed to respond progressively according to the severity of an incoming surge or voltage spike.
This may help protect Gemini and suitably connected equipment, although no protection system can guarantee survival from every electrical event or a direct lightning strike.
Surge Protection Has Practical Limits
Disconnect sensitive equipment during severe electrical storms where it is practical and safe to do so.
Mains protection should not be treated as an absolute guarantee against lightning or major faults within the household supply.
10A HRC Protection
The UK Gemini uses a 10A high-rupturing-capacity protective fuse arrangement.
This helps protect the unit against overload or electrical fault conditions while establishing its maximum UK current rating.
If the protection operates repeatedly, disconnect the connected equipment and investigate the load or possible fault rather than fitting a higher-rated fuse.
Never Increase the Fuse Rating
Only the correct type and rating specified for the product should be used.
Installing a higher-value fuse can defeat the intended protection and create an electrical hazard.
System Link Expansion
The System Link outlet allows Gemini to connect to another compatible IsoTek power-cleaning or distribution product.
This provides additional outlets without requiring a second wall socket and maintains a common star-earth reference across the linked units.
System Link cables are available in several IsoTek cable ranges and must be matched to the connection used by the additional product.
System Link Does Not Increase the Available Power
Adding another IsoTek unit does not increase the current available from the wall supply.
The combined load of Gemini, the linked product and every connected component must remain within the ratings of the complete electrical circuit.
Useful as an IsoTek Expansion Unit
Gemini can provide two additional sockets for a larger IsoTek installation where only a small number of extra connections are required.
For example, it might add power for network equipment, a turntable power supply or a separate source component without replacing the system’s main conditioner.
The total load must still be calculated across the complete linked system.
IEC C14 Mains Inlet
The V5 Gemini uses a 10A IEC C14 mains inlet.
IsoTek states that it can be connected using an appropriately rated IEC C13 or C15 power cable.
The selected lead must have a suitable UK wall plug, correct fuse and sufficient electrical rating for the intended system.
Selecting a Power Cable
The incoming power cable should reach the wall socket without tension, sharp bends or a tightly wound coil of unused cable.
Compatible options include IsoTek’s EVO3 Initium, EVO3 Premier and EVO3 Sequel power cables with the appropriate equipment connector.
Audio T can help select a cable according to the system, required length and available budget.
Compact Aluminium Enclosure
The V5 Gemini measures just 80mm wide, 50mm high and 270mm deep.
Its compact shape allows it to sit behind an equipment rack, alongside furniture or close to a simple two-component system without requiring a full component-width shelf.
The product weighs approximately 0.7kg before power cables are connected.
Wall-Mounting Bracket Included
A mounting bracket system is supplied for installations where Gemini needs to be secured behind an equipment rack or suitable furniture.
The mounting surface and fixings must support the unit as well as the mechanical pull created by the connected plugs and power cables.
Keep the inlet, fuse and output sockets accessible for inspection and safe disconnection.
A Power Cleaner, Not a Regenerator
V5 Gemini passively filters and distributes the incoming mains supply.
It does not create a new electrical waveform, regulate the mains voltage or provide the regeneration functions found in IsoTek’s Genesis products.
Its role is to reduce mains noise, limit cross-contamination and provide protected distribution for two compatible components.
DC Blocking Is Not Included
Gemini does not remove direct-current offset from the incoming AC supply.
Where an amplifier or source component produces persistent transformer hum or mechanical vibration caused by DC contamination, a compatible IsoTek Syncro Uni may be installed before Gemini.
The DC blocker must have sufficient capacity for the complete connected load.
Installation Guide
- Check the published mains consumption of both components
- Keep the combined load below 10A or 2,300W
- Position Gemini on a dry, stable surface or fit the supplied bracket
- Keep the mains inlet and fuse accessible
- Switch off and disconnect the equipment
- Connect an appropriately rated IEC C13 or C15 power cable
- Connect each component to one of the two UK outlets
- Arrange the cables without sharp bends or excessive tension
- Connect Gemini to a correctly earthed wall socket
- Switch on Gemini before the connected equipment
- Check for normal operation and excessive heat
- Recalculate the total load whenever the system changes
What Might You Hear?
Reducing mains noise and electrical interaction between two components may help a suitably revealing system reproduce low-level information more clearly.
Depending on the equipment and incoming supply, possible improvements can include cleaner bass definition, clearer separation, a quieter perceived background and more stable stereo imaging.
The scale of any change will depend on the mains supply, connected equipment and existing power arrangement.
V5 Gemini or V5 Polaris?
Choose V5 Gemini When
- Only two power outlets are required
- A compact two-component system is being used
- System Link expansion is the main purpose
- A 270mm enclosure fits the installation
- 10A or 2,300W provides enough capacity
Choose V5 Polaris When
- Six power outlets are required
- Several source and network products need power
- A complete system will use one power bar
- The same 10A capacity remains sufficient
- An EVO3 Initium cable supplied with the unit is useful
The IsoTek V5 Polaris uses the same broad power-cleaning principles with six independently connected output sockets.
V5 Gemini or V5 Corvus?
Choose V5 Gemini When
- Two sockets provide enough connections
- A smaller unit is easier to accommodate
- A simple source and amplifier system is used
- The lowest-cost V5 power bar is preferred
- The unit will extend an existing IsoTek system
Choose V5 Corvus When
- Nine output sockets are required
- Several digital and network products are connected
- A larger complete system needs distribution
- The shared 10A capacity remains sufficient
- A supplied EVO3 Initium cable is preferred
The IsoTek V5 Corvus provides nine independently connected outlets within a wider power-bar enclosure.
Related IsoTek Products and Audio T Guides
Key Features
- Two-way mains power-cleaning system
- Two independently connected UK outlets
- 10A maximum UK current
- 2,300W total capacity at 230V
- Central delta filter topology
- Designed to reduce Common Mode noise
- Designed to reduce Differential Mode noise
- 35dB published RFI reduction
- More than 20dB filtering at 1kHz
- Approximately 42dB filtering at 10kHz
- Independent outlets reduce cross-contamination
- KERP equal-resistance power distribution
- Fully star-earthed internal network
- Silver-plated printed circuit board
- Increased PCB copper loading
- 2mm² multi-strand internal wiring
- Silver-plated 6N oxygen-free copper
- FEP conductor dielectric
- 45,000A instantaneous surge protection
- System Link expansion outlet
- 10A IEC C14 mains inlet
- Compatible with IEC C13 or C15 power cables
- Wall-mounting bracket included
- Compact 80 × 50 × 270mm enclosure
Frequently Asked Questions
How many outlets does the V5 Gemini provide?
It provides two independently connected UK mains outlets plus one System Link connection.
What is the maximum UK current?
The maximum current is 10A across the complete Gemini.
What is the maximum wattage?
The two sockets share a maximum total capacity of 2,300W at 230V.
Does each socket provide 2,300W?
No. The 2,300W rating is shared across both outlets and any equipment connected through System Link.
Can Gemini power an integrated amplifier?
Yes, provided the amplifier and second connected product remain within the total 10A rating.
Is Gemini suitable for a power amplifier?
It can be, but particularly demanding amplifiers or systems approaching 2,300W may be better suited to a 16A IsoTek product.
What is the published RFI reduction?
IsoTek specifies RFI reduction of up to 35dB.
Does it provide surge protection?
Yes. IsoTek specifies 45,000A of instantaneous surge and spike protection.
What are independent outlets?
Each outlet connects directly to the central circuit rather than being linked in a simple daisy chain, helping reduce noise passing between components.
What is System Link?
System Link allows another compatible IsoTek product to be connected while maintaining a common star-earth reference.
Does System Link increase the available power?
No. All connected equipment remains subject to the limits of Gemini and the household electrical circuit.
Which incoming power cable does Gemini use?
Its IEC C14 inlet accepts an appropriately rated IEC C13 or C15 equipment connector.
Does Gemini regenerate the mains?
No. It is a passive mains power-cleaning and distribution product.
Does it remove DC offset?
No. A suitable IsoTek Syncro Uni is required where DC contamination is causing transformer hum or vibration.
Can V5 Gemini be wall mounted?
Yes. A wall-mounting bracket system is included.
What are its dimensions?
It measures 80mm wide, 50mm high and 270mm deep, and weighs approximately 0.7kg.
Why Buy From Audio T?
- Specialist IsoTek demonstrations
- Two-component system planning
- Complete power-consumption checks
- Amplifier compatibility guidance
- Gemini, Polaris and Corvus comparisons
- System Link expansion advice
- Compatible power-cable recommendations
- Wall-mounting and installation guidance
- Home demonstrations where available
- Ongoing system and setup support
Contact your local Audio T store to confirm whether the V5 Gemini provides the correct capacity and outlet arrangement for your system.