iFi iDefender+ - Digital Enhancer Ground Loop Eliminator

SilentPower iDefender+ is a USB ground-loop eliminator designed to stop the hum, buzz, and low-level distortion that can creep into computer-based audio. When multiple devices in your chain create separate earth/ground points, you can end up with a noisy ground loop—iDefender+ “breaks” the loop correctly to lower the noise floor and restore clarity, warmth, and dynamic contrast. Built around SuperSpeed USB 3.0 (with USB 2.0 backward compatibility) and high-quality gold-plated connectors, it preserves data integrity while tackling the most common source of USB audio noise: contaminated USB power and grounding issues. For USB-powered DACs and interfaces, iDefender+ also lets you block power from the computer and inject clean, external 5V power via its dedicated USB-C power port for a noticeably quieter, more stable listening and recording experience.

What It's Good At:

• Eliminating USB ground-loop hum and buzz in DAC, studio interface, and desktop audio setups
• Lowering system noise floor for cleaner detail, improved dynamics, and better resolution
• Blocking noisy 5V bus power from a computer and replacing it with clean external 5V power (when needed)
• Preserving signal transfer with SuperSpeed USB 3.0 architecture and gold-plated connectors
• Quick, plug-and-play troubleshooting for computer audio noise caused by refresh/mouse/EMI artifacts
• Improving reliability of USB audio chains where grounding conflicts prevent optimal DAC performance

iFi iDefender+ Full Specifications:

• Product Name: iDefender+
• SKU: 03-06-037-0001-00 (product page SKU shown; variants have their own SKUs)
• USB Standard: SuperSpeed USB 3.0 (USB 2.0 backward compatible)
• Ground/Noise Technology:
  • IsoGround® with intelligent auto ground-loop detection and disconnection
  • USB Noise Termination® cuts noisy USB power at the input
• Power / Rating: 5V / 1A max
• Clean Power Injection: Dedicated USB-C power supply port to inject external 5V clean power (useful/required for USB-powered DACs)
• External Power Guidance:
  • Recommended: low-noise 5V supplies (e.g., iPower series)
  • Any low-noise 5V power adapter supply can work
  • External 5V power not required for DACs that are not USB-powered
• Connectors: USB 3.0 and USB-C gold-plated connectors
• Available Versions (Variants):
  • USB-C male to USB-C female
  • USB-A male to USB-A female
  • USB-C male to USB-A female
• LED Indicators: Orange indicates connection made; Orange indicates external 5V power supply active
• Dimensions: 50 × 20 × 9 mm (2.0" × 0.8" × 0.4")
• Net Weight: 6.6 g (0.23 oz)
• Warranty: 12 months
• In the Box:
  • 1× iDefender+
  • 1× Quick Start Card
  • 1× Instruction Card
• Notes / Cautions:
  • Image color may differ due to lighting; refer to product for accuracy
  • Not recommended for USB Power Delivery
  • Exceeding voltage/current limits may damage the device and/or connected equipment
  • Specifications subject to change without notice

iFi iDefender+ Q&A:

Which iDefender+ connector versions are available?

iDefender+ comes in three versions: USB-A to USB-A, USB-C to USB-A, and USB-C to USB-C, making it easy to match your computer and DAC/interface ports.

What problem does iDefender+ solve in USB audio setups?

It eliminates ground loops created by multiple earth/ground points in a system, which can cause hum, buzz, and audible noise in DACs, interfaces, and powered speakers.

Will iDefender+ affect USB audio quality or speed?

It supports SuperSpeed USB 3.0 (and is USB 2.0 backward compatible), so it’s designed to maintain proper signal transfer while addressing grounding and power-noise issues.

Do I need an external power supply to use iDefender+?

Not always. If your DAC/interface is USB-powered, it may require external 5V power through iDefender+’s USB-C power port. If your device has its own power (mains or battery), external power is typically not required.

How does the clean-power feature work?

When you connect a low-noise 5V supply to the USB-C power port, iDefender+ blocks power from the computer and feeds the downstream device with cleaner external power.

Is iDefender+ compatible with USB Power Delivery (USB-PD)?

It is not recommended for USB Power Delivery use cases.

What’s the simplest way to set it up?

Place iDefender+ between your USB source (computer/streamer) and your DAC/interface. If your device needs USB bus power, connect a low-noise 5V supply to the side USB-C power port.

What are the key safety limits I should follow?

Stay within the 5V/1A maximum rating. Exceeding voltage or current limits can damage iDefender+ and/or connected equipment.