SilentPower AC iPurifier 2 – Parallel Mains Filter with Active Noise Cancellation and Diagnostic Function
A free mains socket is all the SilentPower AC iPurifier 2 requires to become part of a HiFi or home cinema system. Its Active Noise Cancellation is designed to reduce electromagnetic and radio-frequency interference by more than 40 dB, while LEDs indicate the status of polarity, earth and mains supply. Because the filter operates in parallel, the system’s components do not draw their current through it.
- The SilentPower AC iPurifier 2 offers a particularly uncomplicated route into active mains filtering, requiring neither a new power distributor nor changes to an existing system. Diagnostic LEDs, surge protection and a 4 mm earthing socket broaden its role beyond that of a simple plug-in filter.
Power quality is one of those subjects capable of turning an apparently simple HiFi installation into a rather complex undertaking. Dedicated distributors, filters and carefully planned earthing arrangements can all play a part, but they may also require additional space, new cabling or substantial changes to an existing system.
The SilentPower AC iPurifier 2 takes a deliberately less intrusive approach. Developed by SilentPower, the specialist brand of Abbingdon Music Research, it occupies a free mains socket near the audio or video system and works alongside the connected components rather than sitting directly in their power path.
Key Facts SilentPower AC iPurifier 2
- Parallel mains filter for HiFi and home cinema systems
- Active Noise Cancellation for EMI and RFI interference
- Claimed noise reduction of more than 40 dB
- LED indication for polarity, earth and mains status
- Integrated surge protection rated at up to 22,000 A
- Switchable LED indicators
- 4 mm earthing socket
- Compatible with the SilentPower Groundhog+ Kit
- Operating voltage from 90 to 265 V AC
- EU version measuring 137 × 40 × 40 mm
- Weight of 150 g
Filtering Without Entering the Current Path
Unlike an inline mains filter, the SilentPower AC iPurifier 2 is not connected between a wall socket and an audio component. It is instead plugged into an available socket close to the system, where it operates in parallel with amplifiers, source components, active loudspeakers and other equipment sharing the same mains supply.
Consequently, the operating current required by those components does not pass through the AC iPurifier 2. This also makes installation straightforward, as neither the existing power cables nor the mains distributor generally need to be replaced or rearranged.
SilentPower recommends positioning the filter as close as possible to the HiFi or AV system. Its compact construction also makes it suitable for installations where there is little room for another component or an additional mains distribution unit.
Active Cancellation for Mains-Borne Interference
At the heart of the AC iPurifier 2 is what SilentPower calls Active Noise Cancellation. Although the name will be familiar from headphones, this implementation is concerned with electrical interference on the mains supply rather than ambient sound.
The circuit is designed to identify electromagnetic and radio-frequency interference and generate an inverted signal intended to reduce it. SilentPower quotes attenuation of more than 40 dB, corresponding to a reduction by approximately a factor of 100.
How clearly this affects an individual system will inevitably depend on the local electrical installation, the connected equipment and the level and nature of the interference present. The parallel design nevertheless allows the filter to be added or removed easily, without changing the fundamental signal or power architecture of the system.
LEDs Provide an Immediate Status Check
The AC iPurifier 2 is also intended to provide basic information about the mains socket into which it is connected. Separate LEDs indicate polarity, earth and general operating status, giving the user an immediate visual check without additional measuring equipment.
When all indicators illuminate green, the device has detected what it regards as a normal operating condition. A red polarity indicator points to reversed polarity, while a red earth indicator signals a potential problem with the protective earth.
If all LEDs remain dark, either no mains voltage is present or the device has detected a fault condition. The indicators can also be switched off, which is useful when the AC iPurifier 2 is installed in a darkened listening room or home cinema.
These indicators should be regarded as an initial diagnostic aid rather than a substitute for professional electrical testing. If the unit reports an earthing problem or another persistent irregularity, the socket and electrical installation should be inspected by a qualified electrician.
Integrated Protection Against Voltage Spikes
SilentPower has incorporated surge protection into the compact enclosure. The manufacturer specifies a maximum rating of 22,000 A at 1,000 V with an 8/20 µs impulse waveform, providing an additional level of protection against short-duration voltage spikes.
This function does not replace a properly planned surge-protection system for an entire building. It does, however, add a useful safeguard directly alongside the audio or video system without requiring another full-size power component.
A Separate Connection for Additional Earthing
A 4 mm socket on the side of the AC iPurifier 2 allows a supplementary earthing solution to be connected. It is compatible with the SilentPower Groundhog+ Kit, which is designed to provide an earth connection for suitable components and help drain unwanted electrical interference.
SilentPower particularly recommends this combination where humming or buzzing is present within a system. The suitability of any additional earthing arrangement will depend on the equipment and installation, so questions concerning protective earth should always be assessed with the necessary technical care.
One Filter or More?
For more extensive installations, SilentPower proposes using a second AC iPurifier 2. One device can be placed near the sockets serving analogue components and another near the digital section of the system, providing parallel filtering for the respective equipment groups.
Whether this offers an advantage will depend on the structure of the mains distribution and the interference present at the installation. Since the devices do not carry the supply current of the connected components, the concept can be expanded without reorganising the system’s entire power arrangement.
The Most Important Advantages at a Glance
- Straightforward installation: The filter simply occupies an available mains socket near the system.
- Parallel operation: Amplifiers, source components and active loudspeakers do not draw their current through the unit.
- Active interference reduction: Active Noise Cancellation is designed to attenuate EMI and RFI on the mains supply.
- Immediate diagnostics: LEDs provide information about polarity, earth and general operating status.
- Discreet operation: The indicators can be disabled in listening rooms and home cinemas.
- Additional surge protection: The integrated circuit provides another line of defence against short voltage spikes.
- Optional supplementary earthing: The 4 mm socket supports the SilentPower Groundhog+ Kit.
- Scalable installation: Multiple filters can be used for separate groups of analogue and digital components.
Price & Availability
The SilentPower AC iPurifier 2 is available now through WOD Audio and authorised specialist retailers. The recommended retail price is € 129,-.
Conclusion – A Compact Addition with Several Roles
The SilentPower AC iPurifier 2 turns mains filtering into a genuinely uncomplicated upgrade. It requires only a spare socket, does not carry the operating current of the system and can be integrated without replacing an existing power distributor or reorganising the installation.
Its actual influence on a HiFi or home cinema system will naturally depend on the local mains conditions. Even so, the combination of active parallel filtering, status diagnostics, switchable LEDs, surge protection and an optional earthing connection gives this compact device a broader remit than its modest dimensions might initially suggest.
| Product | SilentPower AC iPurifier 2 |
|---|---|
| Price | € 129,- |
Technical Specifications
| Product | SilentPower AC iPurifier 2 |
|---|---|
| Product type | Parallel mains filter |
| Technology | Active Noise Cancellation |
| Targeted interference | EMI and RFI on the mains supply |
| Claimed interference reduction | More than 40 dB, approximately factor 100 according to the manufacturer |
| Diagnostics | LED indicators for polarity, earth and mains status |
| LED indicators | Switchable |
| Surge protection | Maximum 22,000 A at 1,000 V, 8/20 µs |
| Earthing interface | 4 mm socket |
| Compatible earthing solution | SilentPower Groundhog+ Kit |
| Operating voltage | 90 to 265 V AC |
| Dimensions, EU version | 137 × 40 × 40 mm |
| Weight, EU version | 150 g |
| Brand | SilentPower |
|---|---|
| Manufacturer | Abbingdon Music Research |
| Distribution | WOD Audio |
| More about this manufacturer at HiFi BLOG |
