iFi SilentPower AC iPurifier

The SilentPower AC iPurifier is an active mains power purifier built for audio, AV, and professional systems affected by “dirty” AC—buzz, hum, harshness, and lost detail caused by EMI (electromagnetic interference) and RFI (radio-frequency interference). Rather than relying on passive filtering alone, it uses Active Noise Cancellation (ANC) circuitry to counter incoming noise across a broad frequency range, lowering the noise floor and helping your system sound cleaner and more stable. Plug it into the wall outlet feeding your system or into a power strip/power station powering your gear, then use its smart diagnostics to verify polarity and ground/earth status. Intelligent Ground via a 4mm grounding port is designed to add a supplementary earth connection without creating ground-loop hum, and built-in surge protection helps defend downstream equipment from voltage spikes.

What It's Good At:

• Cleaning up noisy mains power fast to reduce hum, buzz, and grain for clearer sound
• Active EMI/RFI reduction (ANC) that targets interference beyond typical passive filters
• Improving clarity and low-level detail by lowering the perceived noise floor
• Polarity + earth/ground diagnostics that help spot common installation issues immediately
• Ground-loop-safe supplementary grounding via Intelligent Ground (4mm grounding port)
• Added protection against voltage spikes with high-current surge handling and auto cut-off behavior

iFi SilentPower AC iPurifier Full Specifications:

• Product name: SilentPower AC iPurifier
• Type: Active mains power purifier / conditioner accessory
• Technology: Active Noise Cancellation (ANC) for mains-borne EMI/RFI
• Noise reduction: < 40dB (> 100x)
• Surge protection: max. 30,000A @ 1,000V/10uS
• Over-voltage Surge Protection behavior: Auto detection and cut-off; may take several minutes to reboot after a cut-out event
• Operating voltage: 90V – 265V
• Socket / version options: US, EU, UK (UK use may be via adapter depending on installation)
• Power supply design: Special linear power supply (does not use SMPS)
• Smart diagnostics: LED indication for polarity status and ground/earth presence
• Intelligent Polarity: Visual polarity indication (green = correct, red = incorrect) for supported plug types
• Ground/Earth detection: Visual earth status indication (green = earth present, red = no earth)
• Grounding port: 4mm supplementary ground/earth connection (Intelligent Ground; designed to avoid ground loops)
• Dimensions (US): Ø 40mm x 105mm (L)
• Weight (US): 108g / 0.24 lbs
• Dimensions (EU): Ø 40mm x 115mm (L)
• Weight (EU): 126g / 0.28 lbs
• Warranty period: 12 months (1 year)
• Compliance: CE compliant and meets relevant harmonised safety standards
• In the box: 1x AC iPurifier, 1x User Manual
• Placement / use: Plug into the wall outlet feeding the system or into a power strip/power station powering the system; try both for best results
• System scaling tip: Multiple AC iPurifiers can be used simultaneously; adding more can further improve overall power cleanliness
• Power strip placement tip: Central placement on a strip can help reduce/contain noise between sections
• Note: Product image colour may differ due to lighting

iFi SilentPower AC iPurifier Q&A:

Will surge protection still function if there’s no earth/ground connection?

Yes. The surge protection is designed to operate even if an earth/ground connection is missing.

Does the AC iPurifier use a switching power supply (SMPS) internally?

No. It uses a special linear power supply designed to work across the supported mains voltage range.

Why does the polarity LED change colour occasionally?

The polarity LED can change when the device detects a significant voltage difference between neutral and earth, which can indicate incorrect polarity or an upstream wiring condition.

Is the AC iPurifier compliant with safety standards?

Yes. It is compliant with CE and the relevant harmonised safety standards.

Will Active Noise Cancellation still work if the earth/ground is missing?

Partially. Differential noise reduction (between live and neutral) remains active without earth reference, but common-mode noise reduction (between live/neutral and earth) needs an earth/ground reference to work as intended.

Where should I plug it in for the best results—wall outlet or power strip?

Either can work. Plug it into the wall outlet feeding your system or into the power strip/power station powering your gear, then compare both placements to see which gives the best improvement.

Can I use more than one AC iPurifier in the same system?

Yes. Multiple units can be used at once, and adding more can further improve overall noise reduction across a system.

What is the 4mm grounding port used for?

It can provide a supplementary ground/earth connection when your system lacks an earth/ground. It’s designed to be “smart,” helping avoid introducing ground-loop hum even if the system is already earthed.

iFi SilentPower AC iPurifier Downloads: