The Impact of Headphone Amps on Audio Quality: Can You Amplify Headphones?

When it comes to enhancing your audio experience, there’s more to consider than just the headphones themselves. The little-known secret of audiophiles and sound professionals is the headphone amplifier, a device that can transform your listening experience in ways you might not expect. 

Are there amplifiers for headphones?

There are devices known as headphone amplifiers that can improve the sound quality and volume of headphones, especially those that are high-quality or high-impedance which require more power than typical audio devices can provide.

While it may seem like just another gadget to add to your audio setup, a headphone amplifier has the potential to breathe new life into your music, delivering richer detail, greater dynamics, and overall improved sound quality. 

But how much of a difference can it really make? 

In this article, we get into the world of headphone amplifiers, exploring their benefits, how they work, and whether they’re the right addition to your audio gear. Whether you’re a casual listener or a dedicated audiophile, understanding the role of headphone amplifiers could change the way you listen to your favorite tunes.

FiiO K7 Headphone Amp

Are There Amplifiers For Headphones? Can You Amplify Headphones?

There are amplifiers for headphones, often referred to as “headphone amps.” These devices can improve the sound quality of headphones, particularly high-quality or high-impedance headphones that require more power to operate effectively than typical consumer audio devices can provide.

Headphone amplifiers can be standalone devices, or they can be integrated into other audio equipment like digital-analog converters (DACs), audio interfaces, or AV receivers. 

They take the audio signal from the source device and amplify it before it’s sent to the headphones, allowing the headphones to produce sound at a higher volume and often with improved quality.

Not all headphones need an amplifier though. Many consumer-grade headphones are designed to work well with the power output of common devices like smartphones, laptops, and MP3 players. But for professional-grade or high-impedance headphones, an amplifier may be necessary to get the best sound quality.

Whether headphones need an amp primarily depends on their impedance and sensitivity.

  1. High-Impedance Headphones: Impedance refers to the resistance that the headphones give to the audio signal. Headphones with high impedance (generally over 100 ohms) require more power to drive, which often exceeds what typical consumer devices (like smartphones or laptops) can deliver. Thus, high-impedance headphones can benefit significantly from an amplifier to deliver optimal sound quality.
  2. Low-Sensitivity Headphones: Sensitivity refers to how loud headphones can get per unit of power. Headphones with low sensitivity require more power to achieve a given volume level compared to those with high sensitivity. Therefore, low-sensitivity headphones can also benefit from an amplifier.
  3. High-Quality Audio and Professional Use: Even if the headphones aren’t high-impedance or low-sensitivity, an amp might still be beneficial if you’re seeking the best possible sound quality, especially for professional audio work. An amplifier can provide better control over the sound, improve the dynamic range, reduce distortion, and reveal more detail in the music.

What’s The Difference Between Impedance And Sensitivity?

Impedance and sensitivity are two key specifications for headphones that tell you about their power requirements and how they will perform with different audio equipment.


Impedance is a measure of how much the headphones resist the electrical signal from the audio source. It is measured in ohms (Ω). Higher impedance headphones (generally those over 100 ohms) require more power to drive, which can often exceed what common consumer devices like smartphones or laptops can deliver. 

Therefore, high-impedance headphones often need a headphone amplifier to deliver optimal sound quality. Lower-impedance headphones, on the other hand, can usually be driven effectively by common consumer devices without the need for an amplifier.


Sensitivity refers to how loud the headphones can get per unit of power, and it is usually measured in decibels per milliwatt (dB/mW). Headphones with higher sensitivity will be louder at a given power level compared to headphones with lower sensitivity. 

Therefore, headphones with low sensitivity may need an amplifier to achieve higher volumes without distortion, even if their impedance is not particularly high.

While both impedance and sensitivity can give you an idea of whether a headphone amplifier might be beneficial, they don’t tell you everything about how a pair of headphones will sound. Other factors, such as the quality of the headphones and the audio source, also play a significant role in the overall sound quality.

Do I Need An Amp If My Headphones Are Loud Enough?

If your headphones are loud enough and you’re satisfied with their sound quality when connected to your audio source (like your phone or computer), you probably don’t need a headphone amplifier. Amplifiers aren’t just about volume; they’re about delivering enough power to drive the headphones and produce a clean, high-quality sound.

However, an amplifier can still improve the sound quality in some cases, even if the volume is already sufficient. For instance, it can provide better control of the drivers in the headphones, leading to improved dynamics, detail, and bass response. It may also help reduce distortion at higher volume levels.

But again, it depends on the headphones and the source. Lower-impedance headphones (like most consumer-grade models) are designed to work well with the lower power output of devices like smartphones and laptops, so they may not benefit as much from an amplifier. Higher impedance headphones (like many professional or audiophile-grade models), on the other hand, can often benefit from an amplifier even if they’re already loud enough.

Whether or not you need an amp if your headphones are loud enough depends on a few factors, including:

  • The impedance of your headphones: The impedance of headphones is a measure of how much electrical resistance they have. Headphones with a higher impedance require more power to drive them, so they may benefit from using an amp.
  • The output power of your source: The output power of your source is the amount of power it can deliver to your headphones. If your source has low output power, then your headphones may not get loud enough without an amp.
  • Your personal preferences: Some people find that using an amp improves the sound quality of their headphones, even if they are already loud enough. Others don’t notice a difference.

In short, while you may not need a headphone amplifier for volume, you might still want one for quality, but it depends on your specific headphones and how satisfied you are with their current performance.

Do Headphone Amps Affect Sound Quality?

Headphone amplifiers can significantly affect sound quality by providing more power and reducing noise. The extent to which an amp affects sound quality depends on a number of factors including the output impedance and frequency response of the amp as well as headphone impedance. 

The degree and nature of headphone amps affecting sound quality can depend on several factors, including the following:

  1. Headphone Impedance: High-impedance headphones (generally those with an impedance over 100 ohms) require more power to deliver high-quality sound. A headphone amp can provide this power, allowing the headphones to produce their best possible sound.
  2. Headphone Sensitivity: This is a measure of how effectively a pair of headphones converts an electrical signal into an audible sound. Headphones with low sensitivity may benefit from an amp, even if their impedance isn’t especially high.
  3. Sound Detail and Dynamics: A good headphone amplifier can improve the detail, clarity, and dynamic range (the difference between the quietest and loudest sounds) of your audio. This can make the music sound more lifelike and engaging.
  4. Reduced Distortion: An amplifier can help reduce distortion, especially at higher volumes. Without enough power, the audio signal can become distorted, leading to a loss of quality.
  5. Source Device Limitations: If your source device (like your smartphone or computer) doesn’t have a powerful enough built-in amp, it might not drive your headphones to their full potential. In this case, an external headphone amp can help.

The effect on sound quality will depend on the quality of the amp itself. Not all amps are created equal, and a poor-quality amp could potentially degrade your sound. 

If your headphones are already being driven adequately by your source device, an amp might not make a significant difference. But in many cases, especially with higher-end headphones, a good amp can provide a noticeable improvement in sound quality.

Why Do Amps Make Headphones Sound Better?

Headphone amplifiers can make headphones sound better through several mechanisms:

  1. Power Delivery: High-quality, high-impedance, or low-sensitivity headphones often require more power to produce high-quality sound than is available from common audio source devices like smartphones or laptops. A headphone amplifier can deliver this extra power, ensuring that the headphones can produce sound at their full potential.
  2. Improved Dynamics: Amplifiers can help improve the dynamic range of the audio, which is the difference between the quietest and loudest sounds. This can make the music sound more lifelike and engaging.
  3. Reduced Distortion: An amplifier can help reduce distortion, particularly at higher volumes. Without enough power, the audio signal can become distorted, leading to a loss of quality.
  4. Better Frequency Response: The frequency response of an amp is a measure of how well it reproduces different frequencies of sound. A good amp will have a flat frequency response, which means that it will reproduce all frequencies equally. This can help to ensure that your headphones sound balanced and accurate. This can particularly be the case with high-quality recordings and high-end headphones.
  5. Control of the Drivers: An amplifier provides better control of the headphone drivers (the components that create sound), which can lead to improved sound quality, particularly in terms of bass response and precision.

The improvements you’ll notice depend on various factors, including the quality of the headphones, the quality of the amplifier, and the power requirements of the headphones. 

Lower-end headphones or those designed for low-power devices may not benefit as much from an amplifier. However, for high-end or high-impedance headphones, an amplifier can make a significant difference in sound quality.

How Much Of A Difference Does A Headphone Amp Make?

The difference a headphone amplifier makes can vary greatly depending on several factors:

  1. Type of Headphones: High-impedance headphones (generally those over 100 ohms) or headphones with low sensitivity often benefit significantly from a headphone amplifier. These types of headphones require more power to deliver high-quality sound, and a headphone amplifier can provide this extra power.

    On the other hand, typical consumer headphones (those with lower impedance) are designed to work well with the power output from common devices like smartphones or laptops, and they may not benefit as much from an amplifier.
  2. Quality of the Amplifier: Just like headphones, not all amps are created equal. A high-quality amplifier can provide noticeable improvements in sound quality, while a lower-quality amplifier might not make much difference or could even degrade the sound.
  3. Quality of the Source: If you’re listening to high-quality audio files or high-quality streaming audio, a headphone amplifier can help reveal more detail and provide a richer, more dynamic sound. On the other hand, if you’re listening to lower-quality audio (like highly compressed MP3 files), an amplifier might not make much difference.
  4. Personal Perception: Sound is highly subjective, and different people might perceive the difference made by a headphone amplifier in different ways. Some people might find that an amplifier significantly improves their listening experience, while others might find the difference more subtle.

While a headphone amplifier can make a significant difference in sound quality for some headphones and listeners, the exact degree of difference can vary depending on a number of factors. 

If you’re considering buying a headphone amplifier, it might be a good idea to try one out first with your specific headphones and typical audio sources to see how much of a difference it makes for you.

The Final Word on Headphone Amplifiers

The journey through the world of sound is a fascinating one, and the potential role of headphone amplifiers in enhancing that journey is undeniable. From high-impedance headphones to high-quality audio files, these devices can significantly improve the listening experience in the right circumstances. 

Yet, as we’ve seen, they’re not a one-size-fits-all solution. The benefits of a headphone amplifier can be influenced by various factors, including the type and quality of your headphones, the source of your audio, and even your own personal perception of sound.

The question of whether a headphone amplifier is worth the investment comes down to your individual needs, preferences, and the equipment you’re already using. 

If you’re seeking the best possible audio experience and you’re equipped with headphones capable of delivering it, a headphone amplifier could be the key to unlocking the full potential of your sound. 

But the only way to truly know if a headphone amp is right for you is to give it a try.

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