What Is Hum in Audio? Understanding and Solving Audio Hum Issues

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

Image of a mixing console pexels

Have you ever been laying down a sick beat and suddenly noticed an annoying buzz messing with your groove? That’s likely a hum in audio! In this blog post, we’ll break down the causes of audio hum and how ground loops and electrical interference play their part. 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. 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.

What causes hum in audio?

The causes of 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.

Image of a mixing console pexels
Image of a mixing console pexels

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 the 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.

The following table illustrates the common frequencies associated with audio hums and their potential causes. It’s crucial to understand the frequency of the hum to diagnose and solve the problem.

How do unseen fields interfere with your sound?

Electromagnetic interference (EMI) and radio frequency interference (RFI) can also be to blame for the annoying hum. Picture EMI as a party crasher that messes with your audio signals using electrical and magnetic fields. Similarly, RFI is like a mischievous radio wave hijacking your sound system.

Here’s a scenario: You’re in your studio recording vocals, and suddenly there’s a hum that just won’t quit. You realize the microphone is placed near a fluorescent light. Well, that light’s electrical field is interfering with your microphone’s signal, resulting in that unwanted hum. So, what can you do? Simple! Move the microphone away from the light or use shielded cables to block the interference.

Frequency (Hz)Common Cause
50/60AC mains hum (Power lines, power adaptors)
100/120Ground loop hum
180Amplifier hum
250Internal electronic device interference
400Fluorescent lights
800-1200Computer monitors or TV sets
1400-1600Radio Frequency Interference (RFI)
Above 2000High-frequency oscillations or feedback
Common frequencies and causes of audio hum

Why does electricity play a role in this sonic disturbance?

Ground loops and improper grounding are common culprits behind the hum in audio. When multiple paths to ground exist in an audio system, it creates a loop where electrical current flows. Think of it as a roundabout where the current gets dizzy and causes a hum as it goes in circles.

This can happen when different outlets or circuits are involved. The electrical current creates a magnetic field that nearby audio equipment picks up, resulting in that frustrating hum.

To solve this, we recommend using a ground isolator or making sure all your equipment is plugged into the same outlet or circuit. Keep the current flowing smoothly without any detours.

Image of a mixing console pexels
My favorite MIDI keyboard (at the moment):

AKAI Professional MPK Mini MK3

What is hum in audio? Understanding and solving audio hum issues | 717qmgla7zl. Ac sl1500 | audio apartment
My favorite MIDI keyboard (at the moment):

AKAI Professional MPK Mini MK3

I’m loving the AKAI MPK Mini MK3 for its compact design and the range of controls. It’s one of my essential tools. The velocity-sensitive keys and MPC-style pads are great for making beats, while the thumbstick and knobs give me precise control.

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.

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 to 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!

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

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.

Is your power source playing tricks on your sound quality?

Power supply problems can also cause hum in audio equipment. Imagine a misbehaving power supply as the black sheep in your audio family. It introduces noise into the audio signal, disrupting the harmony. Additionally, improper grounding of a power supply can create a ground loop, leading to that buzzing hum.

Let’s say you’re rocking out on your guitar and notice an irritating hum coming from the amplifier. It’s like a fly in your sound soup, disturbing the delicious tones. In this case, make sure your power strip is properly grounded or plug the amplifier into a separate outlet. Separate the troublemaker from the crowd and let your sound shine.

Could your cables be the source of all the noise?

Ah, cables, the unsung heroes of the audio world. But sometimes they can turn against us and contribute to the hum. Damaged or poorly shielded cables act as gateways for EMI or RFI interference to sneak into your audio signal, like a sneaky little gremlin wreaking havoc in your sound waves.

Let’s say you’re connecting your audio interface to your studio monitors using a cable. But wait, there’s that hum again, interrupting your audio bliss. It’s like a party pooper crashing the dance floor. Check your cables for any damage and ensure they are properly shielded. Use high-quality cables to minimize unwanted interference.

This data table provides an overview of the various causes of hum in music. It highlights the common sources of hum and their impact on audio quality.

Causes of HumDescription
Ground loopsMultiple paths to ground create a current flow, resulting in hum.
Electromagnetic interference (EMI)Electrical and magnetic fields interfere with audio signals, causing hum.
Power supply issuesImproper regulation or grounding of power supplies introduce noise into the audio signal.
Cable problemsDamaged or poorly shielded cables allow interference, leading to hum.
An overview of the causes of hum in music and their impact on audio quality

What is the science behind the hum in audio?

To truly understand hum in audio, it’s important to explore the science behind it. It’s like becoming a detective, unraveling the mysteries of sound and electricity. So, let’s dive into the physics of electromagnetic radiation and its impact on audio quality.

The physics of electromagnetic radiation and how it affects audio

Electromagnetic radiation is a form of energy that travels through space in the form of waves. It’s like invisible waves dancing through the air, carrying information with them. These waves have both an electric field and a magnetic field, and they can interact with audio signals.

In audio systems, electromagnetic radiation can be problematic because it can interfere with the electrical signals used to produce sound. It’s like an uninvited guest trying to join the party and causing a stir. This interference can lead to the hum that we hear in audio recordings and live sound.

How do frequency and wavelength contribute to the hum in your audio?

Frequency and wavelength play important roles in the production of hum in audio. Frequency refers to the number of times a wave cycles per second, while wavelength represents the distance between two peaks of a wave.

In the context of audio, low-frequency electromagnetic waves are often the troublemakers when it comes to hum. These waves have longer wavelengths, allowing them to penetrate through the shielding of audio equipment more easily. It’s like a sneaky infiltrator slipping through the cracks.

By understanding the science behind hum, we can better equip ourselves to tackle this sonic nuisance. Let’s explore some practical solutions and techniques to prevent and eliminate hum in your audio systems.

Whether you’re setting up a home recording studio or engaging in music production, understanding the effects of hum on audio is crucial. You want your sound to be clean, pure, and free from unwanted interference. By addressing the issue of hum, you ensure that your audio environment is optimized for creativity and sonic excellence.

Here’s a handy table summarizing some dos and don’ts to help you tackle the hum in your audio systems:

Ensure proper grounding of your audio equipment.Ignore cable problems or poor shielding.
Use ground isolators to eliminate ground loops.Overlook power supply issues.
Keep audio cables away from potential sources of electromagnetic interference.Neglect the impact of frequency and wavelength on hum.
Regularly inspect cables for damage and replace if necessary.Regularly inspect cables for damage and replace them if necessary.
Dos and don’ts of eliminating hum in audio
Closeup of audio cables connected in a mixer. Source: unsplash
Closeup of audio cables connected in a mixer. Source: unsplash

Tips and techniques for reducing hum

Dealing with hum in your audio can be frustrating, but fear not! With the right knowledge and tools, you can minimize and eliminate hum, creating a clean and interference-free audio experience. So, let’s explore some tried-and-true tips and techniques for reducing hum in your audio systems.

1. Proper grounding and cable management

  • Ensure that all your audio equipment is properly grounded. This helps to prevent ground loops, which are a common cause of hum. Connect everything to the same power outlet or use a ground isolator if needed.
  • Keep your audio cables away from potential sources of electromagnetic interference. This includes power cables, fluorescent lights, and other electronic devices. Maintaining a safe distance helps to minimize the chances of picking up unwanted hum.

2. Shielded cables and quality connections

  • Use high-quality shielded cables for your audio connections. These cables are designed to minimize the impact of electromagnetic interference, reducing the chances of hum creeping into your signal chain.
  • Regularly inspect your cables for damage. Damaged cables can compromise shielding, making them more susceptible to interference and hum. Replace any damaged cables to ensure optimal performance.

3. Proper power supply and regulation

  • Ensure that your power supply is properly regulated. Unstable or poorly regulated power can introduce noise into your audio signal, leading to a hum. Invest in a quality power conditioner or surge protector to provide clean and consistent power to your equipment.
  • Avoid plugging your audio equipment into power strips or outlets with other electronic devices. This reduces the chances of creating ground loops and interference that can result in hum. Use separate outlets or dedicated power sources whenever possible.

4. Isolation and elimination of interference sources

  • Identify potential sources of interference in your environment. This includes devices like computers, fluorescent lights, or mobile phones. Move sensitive audio equipment away from these sources or shield them using physical barriers.
  • Consider using audio transformers or ground loop isolators. These devices can help break the loop that causes ground-related hum, providing a clean audio signal. They act like your very own superhero, protecting your audio from unwanted disturbances.

5. Optimal signal flow and equipment placement

  • Design your signal flow with care. Arrange your audio equipment in a logical and strategic manner to minimize the chances of interference. Think of it as organizing a musical puzzle where every piece finds its rightful place.
  • Keep audio cables away from power cables. Crossing paths between audio and power cables can result in electromagnetic interference and hum. By maintaining separation, you ensure cleaner audio signals.

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.

Advantages and disadvantages of ground loop isolators

Ground loop isolators are devices used to eliminate hum caused by ground loops in audio systems. They can be a valuable tool for achieving clean and interference-free audio. Let’s explore the advantages and disadvantages of using ground loop isolators in your setup.

Advantages of ground loop isolators

  • Eliminates ground loop hum: Ground loop isolators effectively break the loop that causes ground-related hum, resulting in a significant reduction or elimination of unwanted noise.
  • Easy to install: Ground loop isolators are typically plug-and-play devices that can be easily connected between audio components, making them convenient to use in various setups.
  • Preserves audio quality: When properly installed, ground loop isolators effectively reduce hum without negatively impacting the overall audio quality. This allows you to enjoy cleaner sound without compromising the integrity of your audio signals.

Disadvantages of ground loop isolators

  • Limited effectiveness: While ground loop isolators can be highly effective in eliminating ground loop hum, they may not address other sources of hum, such as electromagnetic interference or power supply issues. It’s important to identify and address all potential causes of hum in your audio system.
  • Potential signal degradation: In some cases, ground loop isolators may introduce a slight loss of signal quality or affect frequency response. This impact is typically minimal, but it’s important to consider the specific requirements of your setup.
  • Additional cost: Ground loop isolators are additional devices that may require a separate purchase. This adds to the overall cost of your audio setup, particularly if you have multiple connections that require isolation.

When considering the use of ground loop isolators, it’s important to weigh the benefits against the potential limitations and ensure that they align with your specific needs. It’s also crucial to properly diagnose the cause of hum in your audio system to determine whether ground loops are the primary source of the issue.

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.

Can hum in audio be completely eliminated?

While it’s possible to significantly reduce hum in audio systems, completely eliminating it can be challenging due to various factors such as environmental conditions, equipment limitations, and potential sources of interference. However, by implementing proper techniques and addressing common causes of hum, you can achieve a substantial reduction in unwanted noise.

Are there any DIY methods to reduce hum in audio?

Yes, there are several DIY methods you can try to reduce hum in audio. For example, you can experiment with different cable arrangements, ensuring that audio and power cables are separated and routed away from potential sources of interference. Additionally, using ferrite cores or shielding materials on cables can help minimize electromagnetic interference. However, it’s important to approach DIY methods with caution and seek professional advice if needed.

Can software or plugins help in reducing hum?

While software and plugins can assist in audio processing and restoration, they are generally not designed specifically for eliminating hum caused by hardware or environmental factors. However, some noise reduction plugins may help reduce the audibility of hum to some extent. It’s important to note that addressing the root cause of hum is essential for achieving the best results in minimizing its presence.


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 humming 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.
  • 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'm relatively new to music production, but I've been learning a ton, and documenting my journey along the way. That's why I started this blog. If you want to improve your home studio setup and learn more along with me, this is the place for you!

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Edited by Nick Eggert, Staff Editor

Nick is our staff editor and co-founder. He has a passion for writing, editing, and website development. His expertise lies in shaping content with precision and managing digital spaces with a keen eye for detail.

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