iFi iDefender MAX — Intelligent USB-C Ground Loop Breaker

Eliminate distracting hum and noise in computer-based audio systems — safely, intelligently, and effectively.

The iFi iDefender MAX is an advanced USB-C ground loop noise reducer and power isolator, designed to restore silence and clarity to your Hi-Fi music system. Ground loop noise—often caused by excess earth connections from multiple power plugs—can introduce irritating hum and interference through speakers or headphones. The iDefender MAX intelligently removes unwanted earth connections, allowing you to immerse yourself fully in your music without distraction.

Silence the Hum. Restore the Music.

When multiple grounded devices are connected within an audio system, unwanted ground loops can form. These loops introduce low-level hum and noise that mask musical detail and reduce enjoyment. The iDefender MAX solves this problem by intelligently breaking ground loops—bringing you closer than ever to the music you love.

IsoGround® Technology

iFi’s proprietary IsoGround® Technology intelligently removes the USB earth connection without compromising safety. Unlike traditional ground-lift solutions, iDefender MAX dynamically manages grounding to eliminate noise while maintaining system protection.

USB Noise Termination®

Noise doesn’t just travel through signal lines—it also rides along USB power. USB Noise Termination® technology removes noise at the USB power input itself, stopping interference at the source before it reaches your DAC or audio equipment.

External USB-C Power Input

The iDefender MAX includes a dedicated USB-C power input that completely bypasses USB power supplied by your computer. This allows you to power your system using a cleaner external source, dramatically reducing noise contamination from PCs and laptops.

Retaining Safety — Intelligent Protection

Unlike basic ground-lift devices that can compromise safety, the iDefender MAX continuously monitors current flow. In the event of a fault—such as a short circuit or current surge—it automatically reconnects the earth, ensuring excess current is safely directed away from your equipment.

• Eliminates ground loops without risk
• Automatically restores grounding during faults
• Protects both equipment and users

Perfect Pairing for Modern Systems

Supporting input power up to 100W (20V / 5A), the iDefender MAX goes far beyond traditional USB DAC applications. With full support for USB 3.0 and backwards compatibility with USB 2.0, it ensures high-speed data transfer and flawless playback of high-resolution audio files.

Unleash the Power with SilentPower

For ultimate performance, pair the iDefender MAX with an audiophile-grade external power supply such as the iFi SilentPower iPower2. Featuring Active Noise Cancellation II, iPower2 cancels incoming EMI and RFI noise and is stated to be more than 10× quieter than typical audiophile power supplies.

How to Use

• Insert the iDefender MAX between your computer and USB audio device (DAC, interface, etc.)
• Optionally connect an external USB-C power supply for improved performance
• Enjoy hum-free, cleaner audio playback

Technical Specifications

Why Choose iDefender MAX?

• Eliminates ground loop hum without compromising safety
• Stops USB power noise at the source
• Supports high-power, high-speed USB devices
• Upgradeable with audiophile-grade external power
• Ideal for modern computer-based Hi-Fi systems