What Is Hum in Audio? Conquer the Buzz in Your Music Production

Discover the causes of audio hum, how to identify its source, and effective strategies for minimizing it to improve your audio production quality.

Have you ever been laying down a sick beat and suddenly noticed an annoying buzz messing with your groove? What is a hum in audio, you ask? Well, you’re in the right place to find out! In this blog post, we’ll break down the causes of audio hum, how ground loops and electrical interference play their part and the role of cables, connectors, and audio equipment in this pesky problem.

And don’t worry; we’ll also show you how to identify the source of the hum and share some dope techniques to reduce it, so you can get back to producing those fire tracks without any unwanted noise. Let’s kick off this hum-dinger of a journey!

What is Hum in audio? Hum in audio refers to a persistent, low-frequency noise or buzz often caused by electrical interference, ground loops, or issues with cables and audio equipment.

Image of a mixing console pexels
Image Of A Mixing Console Pexels

What causes hum in audio?

What causes hum in audio can be attributed to various factors. One major cause is ground loops, which occur when multiple devices in an audio setup are connected to different grounding points, leading to an imbalance in the electrical current and consequently creating a low-frequency hum. Ground loops are especially common when video equipment, such as cable TV connections, is involved.

Another cause of audio hum is the noise introduced through digital-to-analog converters used in computer outputs, which may produce hum, hiss, or other types of noise. Upgrading the sound card or installing a PCI or PCIe card may help reduce or eliminate this noise.

Furthermore, hum in audio can manifest as a steady-state bass noise at 60 Hz without significant harmonics, often sounding like a low B-flat on bass guitar with all the treble turned off. On the other hand, a more irritating buzz, which includes harmonic overtones, can be caused by ground loops and typically emanates from loudspeakers.

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How does the ground loop contribute to hum?

Let’s dive into one of the most common causes of audio hum: ground loops. A ground loop occurs when multiple devices in your audio setup are connected to different grounding points, causing an imbalance in the electrical current. This imbalance creates a low-frequency hum, which can seriously mess with your sound quality.

Image of guitar pedals connected to an amplifier and electric guitar. Source: unsplash
Image of guitar pedals connected to an amplifier and electric guitar. Source: Unsplash

One way to tackle ground loop hum is by using a ground loop isolator, a nifty little device that helps balance the electrical currents between your audio equipment. For example, imagine you’ve got a mixer, an audio interface, and a computer all connected in your home studio. By placing a ground loop isolator between your mixer and audio interface, you can eliminate that annoying hum and get back to dropping beats without any buzzkill.

Remember, it’s crucial to understand and address ground loops in your audio setup, so you can create the cleanest, freshest sounds possible. And if you’re still not sure how to tackle ground loops, don’t be afraid to reach out to fellow producers or hit up some expert forums – we’re all in this together, after all!

How does hum affect audio?

Hum can negatively affect audio quality by introducing low-frequency noise into the sound, which can interfere with the clarity and enjoyment of the audio experience. In some cases, hum may result from ground loops, where currents flow through multiple grounding paths in audio or video equipment, causing noise or 50Hz/60Hz hum. This can be especially problematic for audio professionals, who need to identify and eliminate the source of the hum to achieve the desired sound quality.


How to find and fix hum?

Finding and fixing audio hum is essential for improving the overall quality of your sound system or recordings. Follow these steps to diagnose and resolve the issue:

1. Identify the source of the hum

Start by disconnecting all inputs and outputs from your audio equipment. If the hum disappears, reconnect each source one at a time, listening for the hum to return. This will help you determine which connection is causing the issue.

2. Check for ground loops

If removing all inputs eliminates the hum, you likely have a ground loop. Ground loops are common when video equipment is connected, especially with cable TV connections.

3. Remove cable noise

Use cables with ferrite noise suppressors to reduce noise in USB and HDMI connections.

4. Fix audio cables

Inspect your audio cables for any damage or loose connections. If needed, replace them with high-quality cables. Additionally, when wrapping cables, use the over-under technique to minimize cable stress and maintain proper twists.

5. Use an audio troubleshooter

If you’re experiencing hum issues on a Windows computer, use the built-in audio troubleshooter. Search for “audio troubleshooter” in the taskbar, launch the troubleshooter, and follow the on-screen instructions.

6. Upgrade or repair equipment

If the hum is caused by faulty or low-quality recording equipment, consider upgrading or repairing it to improve audio quality

If you want even more tips and insights, watch this video called “How to Fix Ground Loop Noise, Hiss, Buzz, & Hum (Simple & Cheap!)” from the FireWalk YouTube channel.

A video called “How to Fix Ground Loop Noise, Hiss, Buzz, & Hum (Simple & Cheap!)” from the FireWalk YouTube channel.

Frequently asked questions (FAQ)

Do you still have questions about hum in audio? Below are some of the most commonly asked questions.

What causes hum in audio systems?

Hum in audio systems is often caused by ground loops, which occur when multiple paths to ground exist within a system. These loops can create noise and interference, leading to a persistent low-frequency hum in the audio output. Other causes may include faulty equipment or poor-quality cables.

How can I identify the source of hum in my audio system?

To identify the source of hum in your audio system, start by disconnecting all inputs and outputs from your equipment. If the hum disappears, reconnect each source one at a time to pinpoint the problematic connection. If the hum persists even after disconnecting all inputs, it may be due to a ground loop or another issue within the equipment itself.

What are some effective ways to eliminate hum in audio?

To eliminate hum in audio, you can take several steps, such as using high-quality cables and connectors, isolating ground loops with transformers, or employing power conditioners. Additionally, make sure your equipment is properly grounded and maintained, as faulty or worn-out components can also contribute to hum.


We’ve tackled the hum-drum issue of hum in audio systems, and I hope we’ve made a sound impression on you! So, did we hit the right note in helping you understand and address hum-related issues in your audio setup? And did I cover everything you wanted to know? Let me know in the comments section below – I read and reply to every comment. If you found this article helpful, share it with a friend, and check out my full blog for more tips and tricks on audio solutions. Thanks for reading, and here’s to a buzz-free audio experience!

Key takeaways

This article covered What is Hum in audio? Here are some key takeaways:

  • Hum in audio is a low-frequency, continuous noise that can be caused by various factors such as ground loops, electrical interference, and faulty equipment.
  • Ground loops are a common cause of hum, especially when video equipment or cable TV connections are involved.
  • To find and fix the hum in your audio system, try isolating each component to identify the source of the problem, and then address the issue using appropriate methods such as using cables with ferrite cores or isolating ground paths.
  • Be aware of the potential impact of hum on audio quality and the overall listening experience, as it can distract from the intended sound and create an unpleasant environment.
  • Addressing hum in your audio setup can greatly enhance the quality of your audio experience and help you enjoy a clearer and more immersive sound.

Helpful resources

Image Andrew Ash
Written by Andrew Ash, Staff Writer

Hey there! My name is Andrew, and I've been making music since I was a kid. I now run this blog all about home studios and music production. If you want to improve your home studio setup, this is the place for you!

Edited by Luke May, Staff Editor

Luke is a seasoned editor with over seven years of experience. His passion for writing and storytelling started when he was a teenager, spending countless hours reading books and creating his own stories.

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