Understanding Ground Loops and How Radial Engineering Products Eliminate Them

Buzzing, humming, or interference in your audio system? If you've ever experienced these issues during a live event, studio session, or AV installation, chances are you're dealing with a ground loop. In this post, we’ll break down what ground loops are, why they happen, and how Radial Engineering’s innovative solutions can eliminate them.

What Is a Ground Loop?

A ground loop occurs when there are multiple paths to ground in an audio system, creating a loop that can introduce unwanted current into the signal chain. This typically manifests as a low-frequency hum (50 or 60 Hz), an issue that plagues audio engineers and installers alike.

Common scenarios where ground loops arise:

  • Connecting a laptop to a mixer via a 3.5mm cable
  • Using multiple pieces of gear plugged into different power outlets
  • Integrating consumer electronics with professional AV systems

How Radial Engineering Fixes Ground Loop Issues

Radial Engineering is globally trusted for its robust, problem-solving audio interfaces, many specifically designed to tackle ground loops at the source. Here’s how:


Radial Highline

Stereo Passive Line Isolator

Part of Radial's premium Highline series, this stereo passive isolator is designed to eliminate hum and buzz in high-end AV systems, Hi-Fi setups, and pro audio environments. With ultra-low distortion and high common-mode noise rejection, it ensures clean signal transfer without colouring the sound.

Use Case:
Ideal for eliminating noise between consumer audio devices (like streaming units or laptops) and professional playback systems, or in any scenario where line-level ground loops are a problem.

Radial JDI

Passive Direct Box

The Radial JDI is widely regarded as the benchmark passive DI box for professional touring, studio recording, and live sound reinforcement. Built around a premium Jensen transformer, the JDI delivers ultra-clean, phase-accurate audio, with exceptional noise rejection and the ability to handle extreme signal levels without distortion. This is not just a DI box, it’s a problem solver and a staple in the gear racks of world-class engineers and artists.

Use Case:
Cleanly connect bass, keyboards, or laptops to front-of-house systems without buzz or hum.

Radial USB-Pro

Stereo USB DI Box

In today’s hybrid audio world where laptops, streaming, and digital playback are part of almost every setup, the Radial USB-Pro stands out as an essential tool for cleanly connecting computers to professional sound systems. This plug-and-play USB DI box converts digital USB audio signals into balanced, transformer-isolated XLR outputs, making it a favourite among AV technicians, live sound engineers, corporate presenters, and DJs alike.

Bonus Feature:
Ground lift switch and transformer isolation to cut hum without needing external adapters.

Radial Twin-Iso

Line-Level Isolation Box

The Radial Twin-Iso is a professional-grade line-level isolator designed to eliminate noise, hum, and buzz in high-end audio systems especially where multiple devices with different ground references are interconnected. Engineered for the most demanding environments, the Twin-Iso is a favourite among FOH engineers, touring technicians, broadcast professionals, and AV integrators.

Use Case:
Ideal for fixed installations, OB vans, or front-of-house racks with complex signal chains.

Radial StageBug SB-6

Compact Stereo Line Isolator

The Radial StageBug SB-6 is a compact, passive stereo line isolator designed to eliminate ground loops and signal interference in live sound, AV, and studio environments. Don’t be fooled by its small size—this pocket-sized powerhouse is equipped with high-quality isolation transformers that provide crystal-clear audio without noise or hum.

Use Case:
Ideal between a laptop or consumer playback device and a PA mixer in conference rooms or portable systems.