Fosi Audio PH04 4-Channel Headphone Amplifier

Fosi Audio PH04 4-Channel Headphone Amplifier — image 1
Fosi Audio PH04 4-Channel Headphone Amplifier — image 2
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Fosi Audio PH04 4-Channel Headphone Amplifier — image 5
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87%
88%
Audio Quality
92%
Volume Control Precision
85%
Portability
80%
Compatibility with Headphones
87%
Build Quality
90%
Ease of Setup
93%
Noise Level
92%
Value for Money
81%
Durability
89%
Power Supply Stability
85%
Multi-User Suitability
77%
Headphone Impedance Handling
More

Overview

The Fosi Audio PH04 4-Channel Headphone Amplifier is a versatile and compact solution for audio professionals and enthusiasts. This portable amplifier allows multiple users to listen to the same audio mix by powering up to four headphones at once. The independent volume controls for each channel ensure that every listener has their ideal sound level, while the unit is compatible with both 3.5mm and 6.35mm headphones. The small, lightweight design makes it easy to transport, making this headphone amplifier a great choice for both studio and stage environments.

Features & Benefits

This 4-channel amp boasts ultra-low-noise operational amplifiers that provide high-quality audio even at maximum volume, ensuring clear sound without distortion. The portable design includes a power switch and a 3.5mm output, making it an ideal solution for both small and large setups. Whether you're using it in a studio or at a live event, it can easily power up to four headphones simultaneously, offering a great mix of flexibility and power. Additionally, the included 12V power adapter ensures reliable operation during extended use.

Best For

This headphone amplifier is perfect for musicians and audio engineers working in studio environments, especially when multiple listeners need to monitor the same audio. It is also a great tool for small groups, teams, or even performers at live events who require multiple headphone outputs. Additionally, it's an excellent choice for those on a budget looking for an affordable yet high-quality solution to manage group listening without compromising sound clarity or performance.

User Feedback

Users generally praise the clear audio and distortion-free performance of this headphone amplifier, even when pushing the volume levels. Its compact form factor is another highlight, allowing for easy transport and setup during events. Many find the independent volume control for each channel to be a highly practical feature, especially when different listeners prefer different levels. However, some users have mentioned that the amp struggles to drive very high-impedance headphones, so it may not be ideal for all audio setups.

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Pros

  • Ideal for musicians and audio engineers who need multiple headphone outputs in a compact form.
  • Independent volume control for each channel ensures personalized listening for different users.
  • Compatible with both 3.5mm and 6.35mm headphones, offering flexibility in setup.
  • Compact design makes it highly portable, perfect for on-the-go use during live performances or studio sessions.
  • Clear, distortion-free audio even at high volume levels is praised by users.
  • The included 12V power adapter simplifies setup, making it easy to get started right away.

Cons

  • Some users report limitations when using high-impedance headphones, affecting audio performance.
  • Not durable enough for heavy touring or long-term, demanding use in professional settings.
  • Lacks additional advanced features like Bluetooth or integrated audio mixing controls.
  • The unit's build quality may not withstand frequent transport or rough handling over time.
  • Not suitable for those needing to power more than four headphones at once.
  • Occasional compatibility issues with very specific headphone models or brands.

Ratings

After analyzing verified user feedback from diverse sources worldwide, including various languages and platforms, we present the aggregated ratings for the Fosi Audio PH04 4-Channel Headphone Amplifier. All spam, bot, incentivized, and low-quality reviews have been filtered out, ensuring the scores reflect authentic user experiences. Both the product’s strengths and pain points are carefully represented in the following ratings, providing a balanced view of its performance and usability.

Audio Quality
88%
Users consistently praise the clear, distortion-free audio this headphone amplifier delivers, even at high volume levels. Many find it offers exceptional sound clarity for the price, making it ideal for both casual listening and more professional audio setups.
Some users report occasional slight hum or background noise when the volume is turned up too high. While this issue isn't widespread, those with high-end headphones may notice it more than others.
Volume Control Precision
92%
The independent volume controls for each channel have received glowing reviews, with users noting how they allow for a personalized listening experience for each listener. This feature is especially appreciated in group settings or live performances, where different listeners may need different audio levels.
A few users mention that the volume knobs can feel slightly less responsive with heavy usage. However, this issue is rare and doesn’t seem to affect most users.
Portability
85%
Thanks to its compact size and lightweight design, this amp is easily transportable. Users often mention how convenient it is to pack it up and take it to various locations, making it a great choice for musicians or teams who need easy portability.
While the device is portable, a few users have expressed concern about the fragility of the outer casing. Though the amp is generally durable, some report that it may not withstand rough handling as well as expected.
Compatibility with Headphones
80%
20%
The headphone amplifier offers wide compatibility with both 3.5mm and 6.35mm headphones, making it versatile for various audio setups. Users appreciate this flexibility, particularly when switching between different devices or setups.
Some users note that the device might struggle with very high-impedance headphones. While it works well for most headphones, certain models with high impedance may not provide optimal performance.
Build Quality
87%
Users generally find the build quality solid and reliable for the price. The compact and durable design is appreciated, with many mentioning it can handle daily use without showing signs of wear.
A few users point out that the device feels somewhat lightweight, which could lead to concerns about long-term durability if subjected to frequent handling or transport.
Ease of Setup
90%
The setup process is straightforward and user-friendly, with many users highlighting the inclusion of a 12V power adapter for added convenience. Connecting and using the amp is simple, making it ideal for users who need a quick solution without complicated instructions.
Some users have mentioned that the lack of detailed instructions could be an issue for first-time users. However, most people found it easy to set up even without extensive guidance.
Noise Level
93%
The ultra-low-noise operational amplifiers in this device consistently receive praise for their clean sound, even during high-volume playback. Users appreciate the clarity and absence of unwanted noise, making it a great option for professional audio applications.
While the noise level is minimal, a few users report noticing faint background noise in specific setups, especially when paired with high-impedance headphones. This is more of a minor annoyance than a dealbreaker.
Value for Money
92%
Many users feel this device offers excellent value for money, especially considering its performance and audio quality. It delivers a reliable and high-quality headphone amplification solution at a fraction of the cost of similar products in the market.
A small number of users feel the device could offer more advanced features for the price. However, most agree that the amp excels in its primary function and provides great value overall.
Durability
81%
19%
The device is generally considered durable, with many users praising its sturdy build for daily use. For the price, the overall quality is commendable, and most find it holds up well under typical usage conditions.
However, some users do report that the casing can feel a bit flimsy at times, and heavy handling may cause minor issues with long-term durability.
Power Supply Stability
89%
The included 12V power adapter works reliably, with most users highlighting its consistent power delivery. This ensures that the amplifier performs well in a variety of settings, including studio, stage, and live events.
A few users have noted that the power supply could benefit from a longer cord. While this doesn’t detract from the device's overall functionality, it can be a minor inconvenience when setting up in larger spaces.
Multi-User Suitability
85%
The ability to power four headphones simultaneously makes this device a solid choice for group listening scenarios. Users appreciate how it accommodates multiple listeners without sacrificing sound quality or volume.
Some users feel that the amp could handle larger groups better, as the volume for each headphone may be too low when used with more than four listeners. This is more of a limitation for larger-scale setups.
Headphone Impedance Handling
77%
23%
While the device works well with most headphones, it delivers reasonable sound even with higher impedance models within the supported range. This flexibility makes it suitable for various headphones, even for more specialized needs.
A few users report that the amp struggles to properly drive very high-impedance headphones, causing less than optimal performance. This is a limitation for users with premium, high-impedance models.

Suitable for:

The Fosi Audio PH04 4-Channel Headphone Amplifier is ideal for musicians, audio engineers, and small teams who need a practical, portable solution for group listening. Its ability to drive up to four headphones simultaneously, with independent volume control for each channel, makes it a great option for studio settings or live performances. Additionally, its compact size and lightweight build make it an excellent choice for musicians or teams on the go, offering a reliable amplification solution without sacrificing portability. This device is particularly well-suited for anyone looking for an affordable, high-quality headphone amplifier that doesn’t require complex setup or maintenance.

Not suitable for:

However, this headphone amplifier may not be the best fit for users with very high-impedance headphones, as some reviewers reported issues with power output or audio quality when using them. Additionally, while it’s suitable for casual and professional audio needs, those seeking a device with more advanced features or enhanced durability might find it lacking. Users who require a more rugged, heavy-duty amplifier for demanding environments, or those needing more than four headphone outputs, might find the limitations in its power and build quality a drawback. Lastly, those seeking a more specialized amplifier for audiophile-grade sound may want to consider alternatives with better performance for high-impedance headphones.

Specifications

  • Channels: This amplifier features 4 channels, allowing up to four headphones to be used simultaneously.
  • Power Output: The power output is 40mW at 100 Ohms, delivering clear audio at higher volumes without distortion.
  • Input Type: The device accepts audio input through a 3.5mm AUX input jack.
  • Headphone Output: There are four 3.5mm headphone output jacks, each with independent volume control.
  • Impedance Range: Compatible with headphones having an impedance range of 15 to 150 Ohms.
  • Power Adapter: Includes a 12V/1A power adapter for reliable and easy setup.
  • Dimensions: The amplifier has compact dimensions of 4 x 2 x 1 inches, making it highly portable.
  • Weight: Weighs 6.1 ounces, offering a lightweight and easy-to-carry form factor.
  • Volume Control: Each channel has its own independent volume control, allowing personalized audio adjustments.
  • Noise Performance: Equipped with ultra-low-noise operational amplifiers, ensuring clear, distortion-free audio even at high volumes.
  • Portability: The amplifier's small, portable design is ideal for mobile use in various environments, including studios and live events.
  • Compatibility: Works with both 3.5mm and 6.35mm headphones, offering flexibility in headphone choice.
  • Applications: Ideal for musicians, audio engineers, and small groups needing to listen to the same audio mix in studio or live settings.
  • Power Switch: Includes an easy-to-use power switch for convenient on/off control.
  • Audio Quality: Designed for high-quality audio output, with clear and distortion-free sound reproduction at various volume levels.

FAQ

This device is designed to provide multiple headphone outputs with independent volume control. It's ideal for studio, stage, and live performance settings, allowing several users to listen to the same audio mix simultaneously.

To set up, simply plug the included 12V power adapter into the device, connect your audio source via the 3.5mm AUX input, and then plug your headphones into one of the four available output jacks. You can adjust the volume for each channel independently.

Yes, the amplifier is compatible with both 3.5mm and 6.35mm headphone plugs, giving you flexibility in choosing headphones.

The Fosi Audio PH04 can power up to four headphones simultaneously, making it perfect for group listening in studio or event settings.

Yes, this headphone amplifier is compact and lightweight, making it easy to transport for on-the-go use, whether you're in the studio, at a gig, or on location for an event.

While this device works well with most headphones, some users report limitations when using very high-impedance headphones. It's ideal for headphones with impedance between 15-150 Ohms.

Thanks to ultra-low-noise operational amplifiers, this device delivers clear, distortion-free audio even at higher volume levels, ensuring a high-quality listening experience.

No special software or setup is required. Simply plug in your audio source and headphones, adjust the volume on each channel, and you're ready to go.

Yes, this amplifier is well-suited for live performances and events, allowing multiple performers or crew members to listen to the same audio mix through separate headphones.

While it's compact and portable, the build quality may not withstand the rigors of heavy touring or very frequent transport. It’s better suited for studio and moderate on-the-go use.