iFi Audio SilentPower GND Defender

The SilentPower GND Defender is the safe, intelligent way to eliminate annoying ground-loop hum and buzz in interconnected audio and AV systems—without compromising your equipment’s safety earth. Designed to create the optimal “one-ground” configuration, it detects a ground loop at the component and intelligently interrupts the unwanted loop while retaining EMI shielding for cleaner, quieter performance. Unlike risky cheater plugs or basic ground-lift adapters, GND Defender is engineered to auto-reinstate the ground connection if a fault is detected, keeping protection intact while improving system clarity. Simply plug it in-line at the IEC power input—no switches, no settings, just instant troubleshooting relief for hi-fi racks, studios, guitars/amps, and complex Pro AV installations worldwide.

What It's Good At:

• Eliminating low-frequency speaker hum and buzz caused by ground loops
• Preserving safety earth protection (not a traditional ground lift) with automatic fault re-connection
• Retaining EMI shielding for reliable performance in noise-prone environments
• Fast, tool-free installs: plug-and-play, passive operation with zero configuration
• Supporting global systems with 90–240V compatibility and hospital-grade IEC connectors
• Improving audio clarity (and even video cleanliness in AV setups) by reducing ground-borne noise

iFi Audio SilentPower GND Defender Full Specifications:

• Product name: GND Defender
• SKU: 03-06-042-0001-00
• Purpose: Intelligently breaks DC ground loops to eliminate ground-loop hum/buzz
• Intelligent Ground Detection: Automatically disconnects the ground on the connected device when a loop is detected
• Ground Safe (fault protection): Auto-reinstatement / auto-reconnect of ground connection if a fault is detected
• EMI shielding: Retained
• Equipment safety: Maintained (not a traditional ground lift adapter)
• Operation: Passive, no configuration required; installs in-line between power cable and device
• Voltage rating: 90–240V AC
• Continuous current / load: 10A (1100W–2400W)
• Surge overload rating: 220A
• Connectors / format: Universal IEC with hospital-grade IEC connectors
• Construction / components:
  • High-performance glass passivated semiconductor
  • High Case Dielectric Strength 1500VRMS, UL Listed
  • X7R capacitor
  • Fireproof / flame-resistant construction
• Dimensions: 68 × 37 × 32 mm (2.7" × 1.5" × 1.3")
• Weight: 61 g (2.2 oz)
• In the box: 1× GND Defender, 1× User Manual
• Limited warranty: 12 months
• Note: Product image colour may vary due to lighting; refer to the product for accuracy
• Usage note: If multiple ground loops exist, more than one GND Defender may be required

iFi Audio SilentPower GND Defender Q&A:

What is the GND Defender, and what problem does it solve?

GND Defender is an in-line IEC power accessory that inserts resistance between mains earth and your equipment ground to help eliminate ground loops that can cause audible hum through speakers or headphones.

How does the GND Defender reduce hum and buzz in a system?

It reduces the effect of ground loops by intelligently isolating one ground path at the component, which can dramatically lower hum/buzz when multiple devices are earthed to mains power.

How can I tell if I need a GND Defender?

If you hear persistent hum or buzz from speakers or headphones—especially when multiple mains-powered components are connected together—your setup likely has a ground loop and GND Defender is designed to fix it.

Does the GND Defender need power, a switch, or setup?

No. It’s a passive device that works automatically as soon as it’s connected in-line—no buttons, no settings, no configuration.

How do I install and use the GND Defender correctly?

Insert GND Defender into the IEC power input of the device you want to isolate, then plug that device’s power cable into the GND Defender—placing it directly between the component and its power cable.

What causes a ground loop in audio/AV systems?

Ground loops occur when there’s more than one path for ground/shield signals to flow—commonly when multiple mains-earthed components are interconnected with electrical signal cables, creating a loop that produces hum or buzz.

Is the GND Defender safe compared with a basic ground-lift adapter?

Yes. It’s designed to maintain equipment safety earth and retain EMI shielding, and it will automatically reinstate the ground connection if a fault is detected.

Can using the GND Defender affect performance or sound quality?

It’s intended to improve performance by removing ground-loop noise; beyond eliminating hum, it can enhance perceived clarity by reducing ground-borne interference in the system.

iFi Audio SilentPower GND Defender Downloads:

iFi Audio SilentPower GND Defender Connection Guide
iFi Audio SilentPower GND Defender Data Sheet