iFi iDefender MAX USB-C Ground Loop Isolator - Hi-Fi Noise Reducer

iFi iDefender MAX

Intelligent USB-C Ground Loop Noise Eliminator

Pure, Pristine Sound Awaits

The iDefender MAX is a next-generation, intelligent USB-C ground loop breaker designed to eliminate hum, buzz, and unwanted noise in computer-based audio systems—without compromising safety or performance.

If your speakers or headphones suffer from background noise caused by multiple earth connections in your audio chain, iDefender MAX delivers a clean, effective, and audiophile-grade solution.

Why Ground Loops Ruin Your Sound

Modern audio setups often involve multiple connected devices—computers, DACs, amplifiers, and power supplies—each with its own earth connection. These overlapping ground paths create ground loops, introducing audible hum and reducing resolution.

iDefender MAX intelligently removes unwanted earth connections, lowering the noise floor and restoring clarity, detail, and dynamic contrast to your music.

Key Technologies

IsoGround® Technology

Safely and intelligently removes the earth connection to break ground loops—without risking user or equipment safety.

USB Noise Termination®

Eliminates noise from USB power at the source before it can contaminate your audio signal.

External USB-C Power Input

Bypasses noisy USB power from your computer and allows the use of a clean external power supply for superior performance.

Intelligent Safety Protection

Unlike basic ground-lift adapters, iDefender MAX is designed with active safety monitoring.

• Automatically disconnects earth to remove ground loop noise

• Instantly reconnects earth if a current fault or surge is detected

• Excess current is safely redirected to earth, protecting connected equipment

You get noise-free audio without sacrificing electrical safety.

Powerful & Future-Ready

• Supports USB 3.0 SuperSpeed, backward compatible with USB 2.0

• Maintains high-speed data transfer for high-resolution audio playback

• External power input supports up to 100W (20V / 5A)

• Compatible with far more than just USB DACs

This makes iDefender MAX suitable for a wide range of modern audio and digital devices.

Upgrade with Clean External Power

For maximum performance, connect an external power supply via the dedicated USB-C input.

Pairing with iFi iPower2 allows iDefender MAX to completely bypass PC USB power and run on an ultra-quiet, audiophile-grade supply featuring Active Noise Cancellation II technology—over 10× quieter than conventional power adapters.

Key Benefits at a Glance

• Eliminates USB ground loop hum and buzz

• Lowers system noise floor

• Improves clarity, resolution, and dynamics

• Intelligent safety-first ground control

• Supports high-resolution audio and high-speed USB data

• External power upgrade capability

iDefender MAX is the ultimate USB grounding solution for audiophiles who demand silence, safety, and uncompromised sound quality.

Key Features Explained

IsoGround® Technology

IsoGround Technology intelligently removes the earth connection without compromising equipment or user safety.

USB Noise Termination®

The input of the iDefender Max effectively removes noise from USB power at the source.

External USB-C Power Input

A USB-C power input that bypasses USB power from the PC, which you can replace with a clean external power supply.

Retaining Safety

Current surges typically occur due to short circuits, overloaded devices, power supply issues or poor-quality cables and connectors. All lead to an unexpected and sudden increase in current flow. Unlike other ground-lift solutions, the iDefender Max eliminates ground loops without compromising equipment safety. It intelligently and automatically reestablishes the earth connection when a current-related fault is detected, ensuring excess current is directed to the earth rather than to the connected equipment.

Perfect Pairing

The iDefender Max supports input power up to 100W (20V/5A), making it compatible with a wide range of devices and removing it completely from the confines of mere USB DAC applications. With support for USB 3.0 and backwards compatibility with USB 2.0 the iDefender maintains high-speed data transfer and playback of high-resolution audio files, regardless of their quality or file size.

Unleash the Power

The iDefender MAX provides you with the option to further upgrade performance, with a dedicated external power input that completely bypasses the USB power supplied from the connected PC - allowing you to use an audiophile-grade power solution such as our iPower2. The iFi iPower2 is an ultra-quiet, ultra-clean audiophile-grade power supply, featuring our proprietary Active Noise Cancellation II technology to cancel out all incoming extraneous noise. This technology allows it to be more than 10 times quieter than typical audiophile power supplies.